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• How you remember by default functionality/class name etc of the platform

  - by piemesons

  Hello everyone, I am 8 months experienced guy, (B.tech in computer science) In my college time i used to create simple programs in c/c++/java. Simple programs like creating linked list/binary trees programs. frankly saying those college bullshit exercise.(I am from India so Engg colleges in india sucks except few like IIT's etc). In my college time apart from my college exercises i created some better programs/games like arachnoid, snake. We had 6 months internship in our college curriculum. I worked on asp.net. Basically the work was to create a website with some random functionality. After that in my job i worked on php and successfully deployed 4 projects. All having lot of functionality and i was the only team member in all the projects. Now i am learning ruby on rails as i switched to a new firm. I also have to work on android or iphone depending upon on what mobile technology i want to choose or i can work on both of the technologies. My project manager says take your time to learn things. we are not in hurry to place you in any project. Work on things by your self. take 3 4 months to learn. But i am not getting good pace. I am quite confident with php/asp etc but i dont able to grasp things in android. Although my c/c++ background is quite good, having a good logical mind. But i am not able to grasp the things in android. Even learning some basics of rails i found it wtf. Why i have make model name singular and table name plural.By default that action name and name of the file in view is same I just hate the word MAGIC mentioned more than 100 times in the book. (agile-web-development-with-rails) (I am talking about default functionality, I can over ride them that i know, so please dont debate on that) I not saying i am not getting the things. My point is remembering the default functionality is a pissing me off. Lots of classes. Lots of files . specify this thing here. That thing there. All these things (remember which class does what) require some time or i am missing something. For my point of view i am having all these problems cause previously i never used object oriented programming approach in php. (I NEVER USED, I AM NOT SAYING THET ARE NOT) How you people explain it. How you people suggest me to do. I am looking suggestions from some seniors.From seniors in my office.They says you good dude. But i dont know i am not geting confidence in the things. When they ask me anythings about the topics i cover. I give them good answers. So when i discuss this problem with them they says there is no problem just keep on working. And sorry for my poor english.

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• jQuery $.ajax response empty, but only in Chrome

  - by roguepixel

  I've exhausted every avenue of research to solve this one so hopefully someone else will think of something I just didn't. Relatively straight forward setup, I have a html page with some javascript that makes an ajax request to a URL (in the same domain) the java web app in the background does its stuff and returns a partial html page (no html, head or body tags, just the content) which should be inserted at a particular point in the page. All sounds pretty easy and the code I have works in IE, Firefox and Safari, but not in Chrome. In Chrome the target element just ends up empty and if I look at the resource request in Chromes developer tools the response content is also empty. All very confusing, I've tried a myriad of things to solve it and I'm just out of ideas. Any help would be greatly appreciated. var container = $('#container'); $.ajax({ type: 'GET', url: '/path/to/local/url', data: data('parameters=value&another=value2'), dataType: 'html', cache: false, beforeSend: requestBefore, complete: requestComplete, success: requestSuccess, error: requestError }); function data(parameters) { var dictionary = {}; var pairs = parameters.split('&'); for (var i = 0; i < pairs.length; i++) { var keyValuePair = pairs[i].split('='); dictionary[keyValuePair[0]] = keyValuePair[1]; } return dictionary; } function requestBefore() { container.find('.message.error').hide(); container.prepend('<div class="modal"><div class="indicator">Loading...</div></div>'); } function requestComplete() { container.find('.modal').remove(); } function requestSuccess(response) { container.empty(); container.html(response); } function requestError(response) { if (response.status == 200 && response.responseText == 'OK') { requestSuccess(response); } else { container.find('.message.error').fadeIn('slow'); } } All of this is executed in a $(document).ready(function() {}); Cheers, Jim @Oleg - Additional information requested, an example of the response that the ajax call might receive. <p class="message error hidden">An unknown error occured while trying to retrieve data, please try again shortly.</p> <div class="timeline"> <a class="icon shuttle-previous" rel="max_id=16470650733&page=1&q=something">Newer Data</a> <a class="icon shuttle-next" rel="max_id=16470650733&page=3&q=something">Older Data</a> </div> <ol class="social"> <li class="even"> <div class="avatar"> <img src="sphere_normal.gif"/> </div> <p> Some Content<br/> <span class="published">Jun 18, 2010 11:29:05 AM</span> - <a target="_blank" href="">Direct Link</a> </p> </li> <li class="odd"> <div class="avatar"> <img src="sphere_normal.gif"/> </div> <p> Some Content<br/> <span class="published">Jun 18, 2010 11:29:05 AM</span> - <a target="_blank" href="">Direct Link</a> </p> </li> </ol> <div class="timeline"> <a class="icon shuttle-previous" rel="max_id=16470650733&page=1&q=something">Newer Data</a> <a class="icon shuttle-next" rel="max_id=16470650733&page=3&q=something">Older Data</a> </div>

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• How to properly use the .each() command in jQuery

  - by sadmicrowave

  I have a script that checks the class (integer) of a , runs a switch statement to change that integer value to text and appends the text to another in the same listitem tag. I use the .each() function because each listitem starts with class=_[user ID] -- each user can have up to 5 entries.. Enough explaining -- heres the code: <HTML> <li class='_44074'><div class='_12' style='width:380px;'><div style='width:60px; float:left;'>1st</div><div class='verify-type' style='float:left; width:160px;'></div><div style='float:left; width:120px;'>04/26/10 07:29 AM</div></div></li> <li class='_44074'><div class='_6' style='width:380px;'><div style='width:60px; float:left;'>2nd</div><div class='verify-type' style='float:left; width:160px;'></div><div style='float:left; width:120px;'>04/23/10 03:29 PM</div></div></li> <li class='_44074'><div class='_12' style='width:380px;'><div style='width:60px; float:left;'>3rd</div><div class='verify-type' style='float:left; width:160px;'></div><div style='float:left; width:120px;'>04/23/10 03:18 PM</div></div></li> <li class='_44074'><div class='_2' style='width:380px;'><div style='width:60px; float:left;'>4th</div><div class='verify-type' style='float:left; width:160px;'></div><div style='float:left; width:120px;'>04/23/10 02:28 PM</div></div></li> </HTML> when I use the .each() function to scan through each of the listitems begining with the entered user id it only finds the first value (in this case _12) and applies that to all the entries; instead of finding _12, _6, _12, _2 it finds _12, _12, _12, _12...here is the java: $("div#history-menu div#history-text li." + valueid).each(function(){ valueid = $("div#center-box input").val(); checkedvalue=""; checkedvalue = $("div#history-menu div#history-text li." + valueid + " div").attr('class'); switch(checkedvalue){ case '_2':lcCheckedMessage = "Shoes"; break; case '_4':lcCheckedMessage = "Shoe Straps"; break; case '_6':lcCheckedMessage = "Shoes & Shoe Straps"; break; case '_8':lcCheckedMessage = "Wrist Straps"; break; case '_10':lcCheckedMessage = "Shoes & Wrist Strap"; break; case '_12':lcCheckedMessage = "Shoe Straps & Wrist Strap"; break; }; $("div#history-menu div#history-text li." + valueid + " ." + checkedvalue + " .verify-type").text(lcCheckedMessage); });

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• get user selection and convert it to a String [Android]

  - by Kira

  Hello, I just got a Droid, and after having used it for a while, I felt like I wanted to make a program for it. The program that I am trying to make calculates the actual storage capacity of secondary storage mediums. The user select from a list of units that ranges from KB to YB and the size the entered gets put into a formula depending on the chosen unit. However, there is a bit of a problem with the program. From my testing, I have narrowed it down to the fact that the user's selection is not really being obtained from the spinner. Everything I look up seems to point me to a method quite similar to how it works in J2SE, but it does nothing. How am I actually supposed to get that data? Here is the Java source code for the app: package com.Actual.android; import android.app.Activity; import android.os.Bundle; import android.widget.*; import android.view.*; public class ActualStorageActivity extends Activity { Spinner selection; /* declare variable, in order to control spinner (ComboBox) */ ArrayAdapter adapter; /* declare an array adapter object, in order for spinner to work */ EditText size; /* declare variable to control textfield */ EditText result; /* declare variable to control textfield */ Button calculate; /* declare variable to control button */ Storage capacity = new Storage(); /* import custom class for formulas */ /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // load content from XML selection = (Spinner)findViewById(R.id.spinner); adapter = ArrayAdapter.createFromResource(this, R.array.choices_array, android.R.layout.simple_spinner_dropdown_item); size = (EditText)findViewById(R.id.size); result = (EditText)findViewById(R.id.result); calculate = (Button)findViewById(R.id.submit); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); /* set resource for dropdown */ selection.setAdapter(adapter); // attach adapter to spinner result.setEnabled(false); // make read-only result.setText("usable storage"); } public void calcAction(View view) { String initial = size.getText().toString(); String unit = selection.getSelectedItem().toString(); String end = "Nothing"; double convert = Double.parseDouble(initial); capacity.setStorage(convert); if (unit == "KB") { end = Double.toString(capacity.getKB()); } else if (unit == "MB") { end = Double.toString(capacity.getMB()); } else if (unit == "GB") { end = Double.toString(capacity.getGB()); } else if (unit == "TB") { end = Double.toString(capacity.getTB()); } else if (unit == "PB") { end = Double.toString(capacity.getPB()); } else if (unit == "EB") { end = Double.toString(capacity.getEB()); } else if (unit == "ZB") { end = Double.toString(capacity.getZB()); } else if (unit == "YB") { end = Double.toString(capacity.getYB()); } else; result.setText(end); } }

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• RadioGroup onCheckedChanged function won't fire

  - by user1758088

  First time/long time. My app keeps track of restaurant servers' shift sales to help them budget. In the activity that displays past shifts, I've created a RadioGroup under the ListView so the server can choose lunch, dinner, or both. I've implemented RadioGroup.onCheckedChangeListener, but onCheckChanged never gets called. I also tried an anonymous inner class as listener, same result. I tried to copy/modify code from this answer: http://stackoverflow.com/a/9595528 ...but when I added the @Override to the callback function, the Eclipse compiler gave me an error (not warning) that the method must override a superclass, and the quick fix was to remove the override. I'm pretty sure the signatures are correct, as they were made with Eclipse's autocomplete and implement methods facilities. I then followed instructions to move my java compiler from 1.5 to 1.6, and none of the above listed behavior seemed to change. Here's the code I thing is relavent: public class DataActivity extends ListActivity implements OnCheckedChangeListener{ RadioButton rbBoth; RadioButton rbDinnerOnly; RadioButton rbLunchOnly; @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.database); ... final RadioGroup rgGroup = (RadioGroup)findViewById(R.id.DataRadioGroup); rbBoth = (RadioButton)findViewById(R.id.RadioBoth); rbDinnerOnly = (RadioButton)findViewById(R.id.RadioDinnerOnly); rbLunchOnly = (RadioButton)findViewById(R.id.RadioLunchOnly); rgGroup.setOnCheckedChangeListener(this); populateAllShifts(); } ... public void onCheckedChanged(RadioGroup group, int checkedId) { rbLunchOnly.setText("Click!"); Toast.makeText(getApplicationContext(), "Lunch Only", Toast.LENGTH_LONG).show(); if(group.getCheckedRadioButtonId() == R.id.RadioBoth){ populateAllShifts(); return; } if(group.getCheckedRadioButtonId() == R.id.RadioLunchOnly){ populatLunchShifts(); return; } if(group.getCheckedRadioButtonId() == R.id.RadioDinnerOnly){ populateDinnerShifts(); return; } } There is a ListView in this class with a custom adapter, but if my understanding and my XML are correct, the RadioGroup should be outside of the list: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/llDataLayout" android:weightSum="5" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"> <ListView android:layout_weight="4" android:layout_width="fill_parent" android:id="@android:id/list" android:layout_height="wrap_content"></ListView> <RadioGroup android:layout_weight="1" android:id="@+id/DataRadioGroup" android:orientation="horizontal" android:layout_height="wrap_content" android:layout_width="fill_parent"> <RadioButton android:text="Lunch and Dinner" android:textSize="10dp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/RadioBoth"/> <RadioButton android:text="Dinner Only" android:textSize="10dp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/RadioDinnerOnly"/> <RadioButton android:text="Lunch Only" android:textSize="10dp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/RadioLunchOnly"/> </RadioGroup> </LinearLayout> Any ideas out there?

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• C# performance varying due to memory

  - by user1107474

  Hope this is a valid post here, its a combination of C# issues and hardware. I am benchmarking our server because we have found problems with the performance of our quant library (written in C#). I have simulated the same performance issues with some simple C# code- performing very heavy memory-usage. The code below is in a function which is spawned from a threadpool, up to a maximum of 32 threads (because our server has 4x CPUs x 8 cores each). This is all on .Net 3.5 The problem is that we are getting wildly differing performance. I run the below function 1000 times. The average time taken for the code to run could be, say, 3.5s, but the fastest will only be 1.2s and the slowest will be 7s- for the exact same function! I have graphed the memory usage against the timings and there doesnt appear to be any correlation with the GC kicking in. One thing I did notice is that when running in a single thread the timings are identical and there is no wild deviation. I have also tested CPU-bound algorithms and the timings are identical too. This has made us wonder if the memory bus just cannot cope. I was wondering could this be another .net or C# problem, or is it something related to our hardware? Would this be the same experience if I had used C++, or Java?? We are using 4x Intel x7550 with 32GB ram. Is there any way around this problem in general? Stopwatch watch = new Stopwatch(); watch.Start(); List<byte> list1 = new List<byte>(); List<byte> list2 = new List<byte>(); List<byte> list3 = new List<byte>(); int Size1 = 10000000; int Size2 = 2 * Size1; int Size3 = Size1; for (int i = 0; i < Size1; i++) { list1.Add(57); } for (int i = 0; i < Size2; i = i + 2) { list2.Add(56); } for (int i = 0; i < Size3; i++) { byte temp = list1.ElementAt(i); byte temp2 = list2.ElementAt(i); list3.Add(temp); list2[i] = temp; list1[i] = temp2; } watch.Stop(); (the code is just meant to stress out the memory) I would include the threadpool code, but we used a non-standard threadpool library. EDIT: I have reduced "size1" to 100000, which basically doesn't use much memory and I still get a lot of jitter. This suggests it's not the amount of memory being transferred, but the frequency of memory grabs?

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• hosting simple python scripts in a container to handle concurrency, configuration, caching, etc.

  - by Justin Grant

  My first real-world Python project is to write a simple framework (or re-use/adapt an existing one) which can wrap small python scripts (which are used to gather custom data for a monitoring tool) with a "container" to handle boilerplate tasks like: fetching a script's configuration from a file (and keeping that info up to date if the file changes and handle decryption of sensitive config data) running multiple instances of the same script in different threads instead of spinning up a new process for each one expose an API for caching expensive data and storing persistent state from one script invocation to the next Today, script authors must handle the issues above, which usually means that most script authors don't handle them correctly, causing bugs and performance problems. In addition to avoiding bugs, we want a solution which lowers the bar to create and maintain scripts, especially given that many script authors may not be trained programmers. Below are examples of the API I've been thinking of, and which I'm looking to get your feedback about. A scripter would need to build a single method which takes (as input) the configuration that the script needs to do its job, and either returns a python object or calls a method to stream back data in chunks. Optionally, a scripter could supply methods to handle startup and/or shutdown tasks. HTTP-fetching script example (in pseudocode, omitting the actual data-fetching details to focus on the container's API): def run (config, context, cache) : results = http_library_call (config.url, config.http_method, config.username, config.password, ...) return { html : results.html, status_code : results.status, headers : results.response_headers } def init(config, context, cache) : config.max_threads = 20 # up to 20 URLs at one time (per process) config.max_processes = 3 # launch up to 3 concurrent processes config.keepalive = 1200 # keep process alive for 10 mins without another call config.process_recycle.requests = 1000 # restart the process every 1000 requests (to avoid leaks) config.kill_timeout = 600 # kill the process if any call lasts longer than 10 minutes Database-data fetching script example might look like this (in pseudocode): def run (config, context, cache) : expensive = context.cache["something_expensive"] for record in db_library_call (expensive, context.checkpoint, config.connection_string) : context.log (record, "logDate") # log all properties, optionally specify name of timestamp property last_date = record["logDate"] context.checkpoint = last_date # persistent checkpoint, used next time through def init(config, context, cache) : cache["something_expensive"] = get_expensive_thing() def shutdown(config, context, cache) : expensive = cache["something_expensive"] expensive.release_me() Is this API appropriately "pythonic", or are there things I should do to make this more natural to the Python scripter? (I'm more familiar with building C++/C#/Java APIs so I suspect I'm missing useful Python idioms.) Specific questions: is it natural to pass a "config" object into a method and ask the callee to set various configuration options? Or is there another preferred way to do this? when a callee needs to stream data back to its caller, is a method like context.log() (see above) appropriate, or should I be using yield instead? (yeild seems natural, but I worry it'd be over the head of most scripters) My approach requires scripts to define functions with predefined names (e.g. "run", "init", "shutdown"). Is this a good way to do it? If not, what other mechanism would be more natural? I'm passing the same config, context, cache parameters into every method. Would it be better to use a single "context" parameter instead? Would it be better to use global variables instead? Finally, are there existing libraries you'd recommend to make this kind of simple "script-running container" easier to write?

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• LinkedList Wrong Display(string builder)

  - by Chris

  Hello, The following program is a basic linked list divided in 3 classes. In the tester class (main) i add several numbers to the list (sorted). But insteed of getting the numbers as a result i get the result: LinkedList.LinkedList Is something wrong with the stringbuilder (the program was first in java where a string buffer was used, but that should be the same i think?) LinkedListTester.cs using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace LinkedList { public class LinkedListTester { static void Main(string[] args) { LinkedList ll = new LinkedList(); ll.addDataSorted(5); ll.addDataSorted(7); ll.addDataSorted(13); ll.addDataSorted(1); ll.addDataSorted(17); ll.addDataSorted(8); Console.WriteLine(ll); } } }/LinkedList/ LinkedList.cs using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace LinkedList { public class LinkedList { //toestand private LinkedListNode first; private LinkedListNode last; //gedrag public LinkedList() { first = null; last = null; } public void addDataInFront(int data) { first = new LinkedListNode(data, first); if (last == null){ last = first; } }/*addDataInFront*/ public void addDataToBack(int data) { if (first == null) { addDataInFront(data); } else { last.setNext(new LinkedListNode(data, null)); last = last.getNext(); } }/*addDataToBack*/ public void addDataSorted(int data) { if (first == null || first.getData() > data) { addDataInFront(data); } else { LinkedListNode currentNode = first; while (currentNode.getNext() != null && currentNode.getNext().getData() < data) { currentNode = currentNode.getNext(); } currentNode.setNext(new LinkedListNode(data, currentNode.getNext())); currentNode = currentNode.getNext(); if (currentNode.getNext() == null) { last = currentNode; } } }/*addDataSorted*/ public String toString() { StringBuilder Buf = new StringBuilder(); LinkedListNode currentNode = first; while (currentNode != null) { Buf.Append(currentNode.getData()); Buf.Append(' '); currentNode = currentNode.getNext(); } return Buf.ToString(); }/*toString*/ }/*LinkedList*/ }/LinkedList/ LinkedListNode: using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace LinkedList { public class LinkedListNode { //toestand private int data; private LinkedListNode next; private LinkedListNode previous; //gedrag public LinkedListNode(int data, LinkedListNode next) { this.data = data; this.next = next; this.previous = null; } public LinkedListNode(int data, LinkedListNode next, LinkedListNode previous) { this.data = data; this.next = next; this.previous = previous; } public LinkedListNode getNext() { return next; } public LinkedListNode getPrevious() { return previous; } public void setNext(LinkedListNode next) { this.next = next; } public void setPrevious(LinkedListNode previous) { this.previous = previous; } public int getData() { return data; } }/*LinkedListNode*/ }/LinkedList/

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• How to call virtual function of an object in C++

  - by SoonDead

  I'm struggling with calling a virtual function in C++. I'm not experienced in C++, I mainly use C# and Java so I might have some delusions, but bear with me. I have to write a program where I have to avoid dynamic memory allocation if possible. I have made a class called List: template <class T> class List { public: T items[maxListLength]; int length; List() { length = 0; } T get(int i) const { if (i >= 0 && i < length) { return items[i]; } else { throw "Out of range!"; } }; // set the value of an already existing element void set(int i, T p) { if (i >= 0 && i < length) { items[i] = p; } else { throw "Out of range!"; } } // returns the index of the element int add(T p) { if (length >= maxListLength) { throw "Too many points!"; } items[length] = p; return length++; } // removes and returns the last element; T pop() { if (length > 0) { return items[--length]; } else { throw "There is no element to remove!"; } } }; It just makes an array of the given type, and manages the length of it. There is no need for dynamic memory allocation, I can just write: List<Object> objects; MyObject obj; objects.add(obj); MyObject inherits form Object. Object has a virtual function which is supposed to be overridden in MyObject: struct Object { virtual float method(const Input& input) { return 0.0f; } }; struct MyObject: public Object { virtual float method(const Input& input) { return 1.0f; } }; I get the elements as: objects.get(0).method(asdf); The problem is that even though the first element is a MyObject, the Object's method function is called. I'm guessing there is something wrong with storing the object in an array of Objects without dynamically allocating memory for the MyObject, but I'm not sure. Is there a way to call MyObject's method function? How? It's supposed to be a heterogeneous collection btw, so that's why the inheritance is there in the first place. If there is no way to call the MyObject's method function, then how should I make my list in the first place?

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• Two functions working but not when I put them together

  - by Error_404

  I'm really new to C(I have been learning Cuda and wanted to learn C so I can run everything together instead of generating data in Java/Python and copy/pasting it manually to my Cuda program to play with). I am trying to open a large file(20+gb) and parse some data but because I was having problems I decided to try to break down my problem first to verify I can open and read line by line a file and then in another file take a sample of the output of a line and try to parse it, then if all goes well I can simply bring them together. I managed(after a bit of a struggle) to get each part working but when I combine them together it doesn't work(I tried in both eclipse & QT creator. QT creator says it exited unexpectedly and eclipse just stops..). Here's the parsing part(it works exactly as I want): #include <string.h> #include <stdio.h> int main() { char line[1024] = "[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 4],"; size_t len = strlen(line); memmove(line, line+1, len-3); line[len-3] = 0; printf("%s \n",line); char str[100], *s = str, *t = NULL; strcpy(str, line); while ((t = strtok(s, " ,")) != NULL) { s = NULL; printf(":%s:\n", t); } return 0; } The data in variable line is exactly as I get if I print each line of a file. But when I copy/paste it into my main program then it doesn't work(QT shows nothing and eclipse just shows the first line). This code is just a few file IO commands that are wrapped around the commands above(everything within the while loop is the exact same as above) #include <stdio.h> #include <stdlib.h> int main() { char line[1024]; FILE *fp = fopen("/Users/me/Desktop/output.txt","r"); printf("Starting.. \n"); int count = 0; int list[30]; //items will be stored here while(fgets(line, 1024, fp) != NULL){ count++; //char line[1024] = "[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 4],"; size_t len = strlen(line); memmove(line, line+1, len-3); line[len-3] = 0; printf("%s \n",line); char str[100], *s = str, *t = NULL; strcpy(str, line); while ((t = strtok(s, " ,")) != NULL) { s = NULL; printf(":%s:\n", t); } } printf(" num of lines is %i \n", count); return 0; } eclipse output: Starting.. 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 4 I can't figure out what I'm doing wrong. I'm using a mac with gcc 4.2, if that helps. The only thing I can think of is maybe I'm doing something wrong the way I parse the list variable so its not accessible later on(I'm not sure its a wild guess). Is there anything I'm missing?

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• How can i clear a SQLite database each time i start my app

  - by AndroidUser99

  Hi, i want that each time i start my app my SQLite database get's cleaned for this, i need to make a method on my class MyDBAdapter.java code examples are welcome, i have no idea how to do it this is the dbadapter/helper i'm using: public class MyDbAdapter { private static final String TAG = "NotesDbAdapter"; private DatabaseHelper mDbHelper; private SQLiteDatabase mDb; private static final String DATABASE_NAME = "gpslocdb"; private static final String PERMISSION_TABLE_CREATE = "CREATE TABLE permission ( fk_email1 varchar, fk_email2 varchar, validated tinyint, hour1 time default '08:00:00', hour2 time default '20:00:00', date1 date, date2 date, weekend tinyint default '0', fk_type varchar, PRIMARY KEY (fk_email1,fk_email2))"; private static final String USER_TABLE_CREATE = "CREATE TABLE user ( email varchar, password varchar, fullName varchar, mobilePhone varchar, mobileOperatingSystem varchar, PRIMARY KEY (email))"; private static final int DATABASE_VERSION = 2; private final Context mCtx; private static class DatabaseHelper extends SQLiteOpenHelper { DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(PERMISSION_TABLE_CREATE); db.execSQL(USER_TABLE_CREATE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { db.execSQL("DROP TABLE IF EXISTS user"); db.execSQL("DROP TABLE IF EXISTS permission"); onCreate(db); } } /** * Constructor - takes the context to allow the database to be * opened/created * * @param ctx the Context within which to work */ public MyDbAdapter(Context ctx) { this.mCtx = ctx; } /** * Open the database. If it cannot be opened, try to create a new * instance of the database. If it cannot be created, throw an exception to * signal the failure * * @return this (self reference, allowing this to be chained in an * initialization call) * @throws SQLException if the database could be neither opened or created */ public MyDbAdapter open() throws SQLException { mDbHelper = new DatabaseHelper(mCtx); mDb = mDbHelper.getWritableDatabase(); return this; } public void close() { mDbHelper.close(); } public long createUser(String email, String password, String fullName, String mobilePhone, String mobileOperatingSystem) { ContentValues initialValues = new ContentValues(); initialValues.put("email",email); initialValues.put("password",password); initialValues.put("fullName",fullName); initialValues.put("mobilePhone",mobilePhone); initialValues.put("mobileOperatingSystem",mobileOperatingSystem); return mDb.insert("user", null, initialValues); } public Cursor fetchAllUsers() { return mDb.query("user", new String[] {"email", "password", "fullName", "mobilePhone", "mobileOperatingSystem"}, null, null, null, null, null); } public Cursor fetchUser(String email) throws SQLException { Cursor mCursor = mDb.query(true, "user", new String[] {"email", "password", "fullName", "mobilePhone", "mobileOperatingSystem"} , "email" + "=" + email, null, null, null, null, null); if (mCursor != null) { mCursor.moveToFirst(); } return mCursor; } public List<Friend> retrieveAllUsers() { List <Friend> friends=new ArrayList<Friend>(); Cursor result=fetchAllUsers(); if( result.moveToFirst() ){ do{ //note.getString(note.getColumnIndexOrThrow(NotesDbAdapter.KEY_TITLE))); friends.add(new Friend(result.getString(result.getColumnIndexOrThrow("email")), "","","","")); }while( result.moveToNext() ); } return friends; } }

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• c++ protected pointer member to the same class and access privileges

  - by aajmakin

  Hi, Example code is included at the bottom of the message. I'm puzzled about the protected access specifier in a class. I have define a class node which has a protected string member name string name; and a vector of node pointers vector args; Before I thought that a member function of node could not do args[0]-name but a program that does just this does compile and run. However, now I would like to inherit this class and access the name field in one of the args array pointers from this derived class args[0]-name but this does not compile. When I compile the example code below with the commented sections uncommented, the compiler reports: Compiler output: g++ test.cc -o test test.cc: In member function 'void foo::newnode::print_args2()': test.cc:22: error: 'std::string foo::node::name' is protected test.cc:61: error: within this context Compilation exited abnormally with code 1 at Thu Jun 17 12:40:12 Questions: Why can I access the name field of the node pointers in args in class node, because this is what I would excpect from a similarly defined private field in Java. How can I access those fields from the derived class. Example code: #include <iostream> #include <vector> using namespace std; namespace foo { class node; typedef std::vector<node*> nodes; class node { public: node (string _name); void print_args (); void add_node (node* a); protected: nodes args; string name; }; } foo::node::node (string _name) : args(0) { name = _name; } void foo::node::add_node (node* a) { args.push_back(a); } void foo::node::print_args () { for (int i = 0; i < args.size(); i++) { cout << "node " << i << ": " << args[i]->name << endl; } } // namespace foo // { // class newnode : public node // { // public: // newnode (string _name) : node(_name) {} // void print_args2 (); // protected: // }; // } // void foo::newnode::print_args2 () // { // for (int i = 0; i < args.size(); i++) // { // cout << "node " << i << ": " << args[i]->name << endl; // } // } int main (int argc, char** argv) { foo::node a ("a"); foo::node b ("b"); foo::node c ("c"); a.add_node (&b); a.add_node (&c); a.print_args (); // foo::newnode newa ("newa"); // foo::newnode newb ("newb"); // foo::newnode newc ("newc"); // newa.add_node (&newb); // newa.add_node (&newc); // newa.print_args2 (); return 0; }

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• javascript won't execute nested for loop

  - by mcdwight6

  thanks in advance for all your help! i'm fairly new to javascript, but i have a fairly strong background in java, so i thought i would try it out on this project i'm working on. essentially, what i'm trying to do is read data from an xml file and create the html code for the page i'm making. i used the script from w3schools found here. I've altered it and gotten it to pull the data from my own xml and even to do the more basic generation of the html code i need. Here's the html i'm using inside <script> tags: var s = swDoc.getElementsByTagName("planet"); var plShowsArr = s[i].getElementsByTagName("show"); var plGamesArr = s[i].getElementsByTagName("videoGame"); for (i=0;i<s.length;i++) { // test section all works document.write("<div><table border = \"1\">"); document.write("<tr><td>"+ s[i].getElementsByTagName("showText")[0].childNodes[0].nodeValue + "</td><td>" + s[i].getElementsByTagName("showUrl")[0].childNodes[0].nodeValue + "</td></tr>"); document.write("<tr><td>" + s[i].getElementsByTagName("gameText")[0].childNodes[0].nodeValue + "</td><td>" + s[i].getElementsByTagName("gameUrl")[0].childNodes[0].nodeValue + "</td></tr>"); document.write("</tr></table></div>"); // end test section document.write("<div class=\"appearances-row\"><ol class=\"shows\">shows list"); for(j=0;j<plShows.length;j++){ document.write("nested for"); var showUrl = s[i].getElementsByTagName("showUrl")[j].childNodes[0].nodeValue; var showText = s[i].getElementByTagName("showText")[j].childNodes[0].nodeValue; document.write("<li><a href=\""+showUrl+"\">"+showText+"</a></li>"); } the code breaks at the nested for loop at the end, where it finished the document.write and prints "shows list" to the page, but then never gets to the document.write inside. if it helps, the xml contains a list of planets from the star wars universe organized like this: <planets> <planet> <planetName>planet</planetName> <description>some text</description> <appearances> <show> <showUrl>url</showUrl> <showText>hyperlink text</showText> </show> <videoGame> <gameUrl>url</gameUrl> <gameText>hyperlink text</gameText> </videoGame> </appearances> <locationsOfInterest> <location>location name</location> </locationsOfInterest> <famousCharactersRelatedTo> <character>a character</character> </famousCharactersRelatedTo> <externalLinks> <link> <linkUrl>url</linkUrl> <linkText>hyperlink text</linkText> </link> </externalLinks> </planet>

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• Basic C question, concerning memory allocation and value assignment

  - by VHristov

  Hi there, I have recently started working on my master thesis in C that I haven't used in quite a long time. Being used to Java, I'm now facing all kinds of problems all the time. I hope someone can help me with the following one, since I've been struggling with it for the past two days. So I have a really basic model of a database: tables, tuples, attributes and I'm trying to load some data into this structure. Following are the definitions: typedef struct attribute { int type; char * name; void * value; } attribute; typedef struct tuple { int tuple_id; int attribute_count; attribute * attributes; } tuple; typedef struct table { char * name; int row_count; tuple * tuples; } table; Data is coming from a file with inserts (generated for the Wisconsin benchmark), which I'm parsing. I have only integer or string values. A sample row would look like: insert into table values (9205, 541, 1, 1, 5, 5, 5, 5, 0, 1, 9205, 10, 11, 'HHHHHHH', 'HHHHHHH', 'HHHHHHH'); I've "managed" to load and parse the data and also to assign it. However, the assignment bit is buggy, since all values point to the same memory location, i.e. all rows look identical after I've loaded the data. Here is what I do: char value[10]; // assuming no value is longer than 10 chars int i, j, k; table * data = (table*) malloc(sizeof(data)); data->name = "table"; data->row_count = number_of_lines; data->tuples = (tuple*) malloc(number_of_lines*sizeof(tuple)); tuple* current_tuple; for(i=0; i<number_of_lines; i++) { current_tuple = &data->tuples[i]; current_tuple->tuple_id = i; current_tuple->attribute_count = 16; // static in our system current_tuple->attributes = (attribute*) malloc(16*sizeof(attribute)); for(k = 0; k < 16; k++) { current_tuple->attributes[k].name = attribute_names[k]; // for int values: current_tuple->attributes[k].type = DB_ATT_TYPE_INT; // write data into value-field int v = atoi(value); current_tuple->attributes[k].value = &v; // for string values: current_tuple->attributes[k].type = DB_ATT_TYPE_STRING; current_tuple->attributes[k].value = value; } // ... } While I am perfectly aware, why this is not working, I can't figure out how to get it working. I've tried following things, none of which worked: memcpy(current_tuple->attributes[k].value, &v, sizeof(int)); This results in a bad access error. Same for the following code (since I'm not quite sure which one would be the correct usage): memcpy(current_tuple->attributes[k].value, &v, 1); Not even sure if memcpy is what I need here... Also I've tried allocating memory, by doing something like: current_tuple->attributes[k].value = (int *) malloc(sizeof(int)); only to get "malloc: * error for object 0x100108e98: incorrect checksum for freed object - object was probably modified after being freed." As far as I understand this error, memory has already been allocated for this object, but I don't see where this happened. Doesn't the malloc(sizeof(attribute)) only allocate the memory needed to store an integer and two pointers (i.e. not the memory those pointers point to)? Any help would be greatly appreciated! Regards, Vassil

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• How to call a WCF service using ksoap2 on android?

  - by Qing

  Hi all, Here is my code import org.ksoap2.*; import org.ksoap2.serialization.*; import org.ksoap2.transport.*; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class ksop2test extends Activity { /** Called when the activity is first created. */ private static final String METHOD_NAME = "SayHello"; // private static final String METHOD_NAME = "HelloWorld"; private static final String NAMESPACE = "http://tempuri.org"; // private static final String NAMESPACE = "http://tempuri.org"; private static final String URL = "http://192.168.0.2:8080/HelloWCF/Service1.svc"; // private static final String URL = "http://192.168.0.2:8080/webservice1/Service1.asmx"; final String SOAP_ACTION = "http://tempuri.org/IService1/SayHello"; // final String SOAP_ACTION = "http://tempuri.org/HelloWorld"; TextView tv; StringBuilder sb; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); tv = new TextView(this); sb = new StringBuilder(); call(); tv.setText(sb.toString()); setContentView(tv); } public void call() { try { SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); request.addProperty("name", "Qing"); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope( SoapEnvelope.VER11); envelope.dotNet = true; envelope.setOutputSoapObject(request); HttpTransportSE androidHttpTransport = new HttpTransportSE(URL); androidHttpTransport.call(SOAP_ACTION, envelope); sb.append(envelope.toString() + "\n");//cannot get the xml request send SoapPrimitive result = (SoapPrimitive)envelope.getResponse(); //to get the data String resultData = result.toString(); // 0 is the first object of data sb.append(resultData + "\n"); } catch (Exception e) { sb.append("Error:\n" + e.getMessage() + "\n"); } } } I can successfully access .asmx service, but when I try to call a wcf service the virtual machine said : Error: expected:END_TAG{http://schemas.xmlsoap.org/soap/envelope/}Body(position:END_TAG@1:712 in java.io.InputStreamReader@43ba6798 How to print what the request send? Here is the wcf wsdl: <wsdl:definitions name="Service1" targetNamespace="http://tempuri.org/"> - <wsdl:types> - <xsd:schema targetNamespace="http://tempuri.org/Imports"> <xsd:import schemaLocation="http://para-bj.para.local:8080/HelloWCF/Service1.svc?xsd=xsd0" namespace="http://tempuri.org/"/> <xsd:import schemaLocation="http://para-bj.para.local:8080/HelloWCF/Service1.svc?xsd=xsd1" namespace="http://schemas.microsoft.com/2003/10/Serialization/"/> </xsd:schema> </wsdl:types> - <wsdl:message name="IService1_SayHello_InputMessage"> <wsdl:part name="parameters" element="tns:SayHello"/> </wsdl:message> - <wsdl:message name="IService1_SayHello_OutputMessage"> <wsdl:part name="parameters" element="tns:SayHelloResponse"/> </wsdl:message> - <wsdl:portType name="IService1"> - <wsdl:operation name="SayHello"> <wsdl:input wsaw:Action="http://tempuri.org/IService1/SayHello" message="tns:IService1_SayHello_InputMessage"/> <wsdl:output wsaw:Action="http://tempuri.org/IService1/SayHelloResponse" message="tns:IService1_SayHello_OutputMessage"/> </wsdl:operation> </wsdl:portType> - <wsdl:binding name="BasicHttpBinding_IService1" type="tns:IService1"> <soap:binding transport="http://schemas.xmlsoap.org/soap/http"/> - <wsdl:operation name="SayHello"> <soap:operation soapAction="http://tempuri.org/IService1/SayHello" style="document"/> - <wsdl:input> <soap:body use="literal"/> </wsdl:input> - <wsdl:output> <soap:body use="literal"/> </wsdl:output> </wsdl:operation> </wsdl:binding> - <wsdl:service name="Service1"> - <wsdl:port name="BasicHttpBinding_IService1" binding="tns:BasicHttpBinding_IService1"> <soap:address location="http://para-bj.para.local:8080/HelloWCF/Service1.svc"/> </wsdl:port> </wsdl:service> </wsdl:definitions> It uses in tag and the asmx uses in tag what's the difference? Thanks. -Qing

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• checkbox unchecked when i scroll listview in android

  - by Mathew

  I am new to android development. I created a listview with textbox and checkbox. When I check the checkbox and scroll it down to check some other items in the list view, the older ones are unchecked. How to avoid this problem in listview? Please guide me with my code. Here is the code: main.xml: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:id="@+id/TextView01" android:layout_height="wrap_content" android:text="List of items" android:textStyle="normal|bold" android:gravity="center_vertical|center_horizontal" android:layout_width="fill_parent"></TextView> <ListView android:id="@+id/ListView01" android:layout_height="250px" android:layout_width="fill_parent"> </ListView> <Button android:text="Save" android:id="@+id/btnSave" android:layout_width="wrap_content" android:layout_height="wrap_content"> </Button> </LinearLayout> This is the xml page I used to create dynamic list row: listview.xml: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content" android:gravity="left|center" android:layout_width="wrap_content" android:paddingBottom="5px" android:paddingTop="5px" android:paddingLeft="5px"> <TextView android:id="@+id/TextView01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:textColor="#FFFF00" android:text="hi"></TextView> <TextView android:text="hello" android:id="@+id/TextView02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10px" android:textColor="#0099CC"></TextView> <EditText android:id="@+id/txtbox" android:layout_width="120px" android:layout_height="wrap_content" android:textSize="12sp" android:layout_x="211px" android:layout_y="13px"> </EditText> <CheckBox android:id="@+id/chkbox1" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> This is my activity class. CustomListViewActivity.java: package com.listivew; import android.app.Activity; import android.os.Bundle; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.CheckBox; import android.widget.EditText; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; public class CustomListViewActivity extends Activity { ListView lstView; static Context mContext; Button btnSave; private static class EfficientAdapter extends BaseAdapter { private LayoutInflater mInflater; public EfficientAdapter(Context context) { mInflater = LayoutInflater.from(context); } public int getCount() { return country.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { final ViewHolder holder; if (convertView == null) { convertView = mInflater.inflate(R.layout.listview, parent, false); holder = new ViewHolder(); holder.text = (TextView) convertView .findViewById(R.id.TextView01); holder.text2 = (TextView) convertView .findViewById(R.id.TextView02); holder.txt = (EditText) convertView.findViewById(R.id.txtbox); holder.cbox = (CheckBox) convertView.findViewById(R.id.chkbox1); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.text.setText(curr[position]); holder.text2.setText(country[position]); holder.txt.setText(""); holder.cbox.setChecked(false); return convertView; } public class ViewHolder { TextView text; TextView text2; EditText txt; CheckBox cbox; } } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); lstView = (ListView) findViewById(R.id.ListView01); lstView.setAdapter(new EfficientAdapter(this)); btnSave = (Button)findViewById(R.id.btnSave); mContext = this; btnSave.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // I want to print the text which is in the listview one by one. //Later i will insert it in the database // Toast.makeText(getBaseContext(), "EditText Value, checkbox value and other values", Toast.LENGTH_SHORT).show(); for (int i = 0; i < lstView.getCount(); i++) { View listOrderView; listOrderView = lstView.getChildAt(i); try{ EditText txtAmt = (EditText)listOrderView.findViewById(R.id.txtbox); CheckBox cbValue = (CheckBox)listOrderView.findViewById(R.id.chkbox1); if(cbValue.isChecked()== true){ String amt = txtAmt.getText().toString(); Toast.makeText(getBaseContext(), "Amount is :"+amt, Toast.LENGTH_SHORT).show(); } }catch (Exception e) { // TODO: handle exception } } } }); } private static final String[] country = { "item1", "item2", "item3", "item4", "item5", "item6","item7", "item8", "item9", "item10", "item11", "item12" }; private static final String[] curr = { "1", "2", "3", "4", "5", "6","7", "8", "9", "10", "11", "12" }; } Please help me to slove this problem. I have referred in many places. But I could not get proper answer to solve this problem. Please provide me the code to avoid unchecking the checkbox while scrolling up and down. Thank you.

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• Making WCF Output a single WSDL file for interop purposes.

  - by Glav

  By default, when WCF emits a WSDL definition for your services, it can often contain many links to others related schemas that need to be imported. For the most part, this is fine. WCF clients understand this type of schema without issue, and it conforms to the requisite standards as far as WSDL definitions go. However, some non Microsoft stacks will only work with a single WSDL file and require that all definitions for the service(s) (port types, messages, operation etc…) are contained within that single file. In other words, no external imports are supported. Some Java clients (to my working knowledge) have this limitation. This obviously presents a problem when trying to create services exposed for consumption and interop by these clients. Note: You can download the full source code for this sample from here To illustrate this point, lets say we have a simple service that looks like: Service Contract public interface IService1 { [OperationContract] [FaultContract(typeof(DataFault))] string GetData(DataModel1 model); [OperationContract] [FaultContract(typeof(DataFault))] string GetMoreData(DataModel2 model); } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Service Implementation/Behaviour public class Service1 : IService1 { public string GetData(DataModel1 model) { return string.Format("Some Field was: {0} and another field was {1}", model.SomeField,model.AnotherField); } public string GetMoreData(DataModel2 model) { return string.Format("Name: {0}, age: {1}", model.Name, model.Age); } } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Configuration File <system.serviceModel> <services> <service name="SingleWSDL_WcfService.Service1" behaviorConfiguration="SingleWSDL_WcfService.Service1Behavior"> <!-- ...std/default data omitted for brevity..... --> <endpoint address ="" binding="wsHttpBinding" contract="SingleWSDL_WcfService.IService1" > ....... </services> <behaviors> <serviceBehaviors> <behavior name="SingleWSDL_WcfService.Service1Behavior"> ........ </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } When WCF is asked to produce a WSDL for this service, it will produce a file that looks something like this (note: some sections omitted for brevity): <?xml version="1.0" encoding="utf-8" ?> - <wsdl:definitions name="Service1" targetNamespace="http://tempuri.org/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" ...... namespace definitions omitted for brevity + &lt;wsp:Policy wsu:Id="WSHttpBinding_IService1_policy"> ... multiple policy items omitted for brevity </wsp:Policy> - <wsdl:types> - <xsd:schema targetNamespace="http://tempuri.org/Imports"> <xsd:import schemaLocation="http://localhost:2370/HostingSite/Service-default.svc?xsd=xsd0" namespace="http://tempuri.org/" /> <xsd:import schemaLocation="http://localhost:2370/HostingSite/Service-default.svc?xsd=xsd3" namespace="Http://SingleWSDL/Fault" /> <xsd:import schemaLocation="http://localhost:2370/HostingSite/Service-default.svc?xsd=xsd1" namespace="http://schemas.microsoft.com/2003/10/Serialization/" /> <xsd:import schemaLocation="http://localhost:2370/HostingSite/Service-default.svc?xsd=xsd2" namespace="http://SingleWSDL/Model1" /> <xsd:import schemaLocation="http://localhost:2370/HostingSite/Service-default.svc?xsd=xsd4" namespace="http://SingleWSDL/Model2" /> </xsd:schema> </wsdl:types> + <wsdl:message name="IService1_GetData_InputMessage"> .... </wsdl:message> - <wsdl:operation name="GetData"> ..... </wsdl:operation> - <wsdl:service name="Service1"> ....... </wsdl:service> </wsdl:definitions> The above snippet from the WSDL shows the external links and references that are generated by WCF for a relatively simple service. Note the xsd:import statements that reference external XSD definitions which are also generated by WCF. In order to get WCF to produce a single WSDL file, we first need to follow some good practices when it comes to WCF service definitions. Step 1: Define a namespace for your service contract. [ServiceContract(Namespace="http://SingleWSDL/Service1")] public interface IService1 { ...... } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Normally you would not use a literal string and may instead define a constant to use in your own application for the namespace. When this is applied and we generate the WSDL, we get the following statement inserted into the document: <wsdl:import namespace="http://SingleWSDL/Service1" location="http://localhost:2370/HostingSite/Service-default.svc?wsdl=wsdl0" /> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } All the previous imports have gone. If we follow this link, we will see that the XSD imports are now in this external WSDL file. Not really any benefit for our purposes. Step 2: Define a namespace for your service behaviour [ServiceBehavior(Namespace = "http://SingleWSDL/Service1")] public class Service1 : IService1 { ...... } As you can see, the namespace of the service behaviour should be the same as the service contract interface to which it implements. Failure to do these tasks will cause WCF to emit its default http://tempuri.org namespace all over the place and cause WCF to still generate import statements. This is also true if the namespace of the contract and behaviour differ. If you define one and not the other, defaults kick in, and you’ll find extra imports generated. While each of the previous 2 steps wont cause any less import statements to be generated, you will notice that namespace definitions within the WSDL have identical, well defined names. Step 3: Define a binding namespace In the configuration file, modify the endpoint configuration line item to iunclude a bindingNamespace attribute which is the same as that defined on the service behaviour and service contract <endpoint address="" binding="wsHttpBinding" contract="SingleWSDL_WcfService.IService1" bindingNamespace="http://SingleWSDL/Service1"> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } However, this does not completely solve the issue. What this will do is remove the WSDL import statements like this one: <wsdl:import namespace="http://SingleWSDL/Service1" location="http://localhost:2370/HostingSite/Service-default.svc?wsdl" /> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } from the generated WSDL. Finally…. the magic…. Step 4: Use a custom endpoint behaviour to read in external imports and include in the main WSDL output. In order to force WCF to output a single WSDL with all the required definitions, we need to define a custom WSDL Export extension that can be applied to any endpoints. This requires implementing the IWsdlExportExtension and IEndpointBehavior interfaces and then reading in any imported schemas, and adding that output to the main, flattened WSDL to be output. Sounds like fun right…..? Hmmm well maybe not. This step sounds a little hairy, but its actually quite easy thanks to some kind individuals who have already done this for us. As far as I know, there are 2 available implementations that we can easily use to perform the import and “WSDL flattening”.  WCFExtras which is on codeplex and FlatWsdl by Thinktecture. Both implementations actually do exactly the same thing with the imports and provide an endpoint behaviour, however FlatWsdl does a little more work for us by providing a ServiceHostFactory that we can use which automatically attaches the requisite behaviour to our endpoints for us. To use this in an IIS hosted service, we can modify the .SVC file to specify this ne factory to use like so: <%@ ServiceHost Language="C#" Debug="true" Service="SingleWSDL_WcfService.Service1" Factory="Thinktecture.ServiceModel.Extensions.Description.FlatWsdlServiceHostFactory" %> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Within a service application or another form of executable such as a console app, we can simply create an instance of the custom service host and open it as we normally would as shown here: FlatWsdlServiceHost host = new FlatWsdlServiceHost(typeof(Service1)); host.Open(); And we are done. WCF will now generate one single WSDL file that contains all he WSDL imports and data/XSD imports. You can download the full source code for this sample from here Hope this has helped you. Note: Please note that I have not extensively tested this in a number of different scenarios so no guarantees there.

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• Making WCF Output a single WSDL file for interop purposes.

  By default, when WCF emits a WSDL definition for your services, it can often contain many links to others related schemas that need to be imported. For the most part, this is fine. WCF clients understand this type of schema without issue, and it conforms to the requisite standards as far as WSDL definitions go. However, some non Microsoft stacks will only work with a single WSDL file and require that all definitions for the service(s) (port types, messages, operation etc) are contained within that single file. In other words, no external imports are supported. Some Java clients (to my working knowledge) have this limitation. This obviously presents a problem when trying to create services exposed for consumption and interop by these clients. Note: You can download the full source code for this sample from here To illustrate this point, lets say we have a simple service that looks like: Service Contract public interface IService1 { [OperationContract] [FaultContract(typeof(DataFault))] string GetData(DataModel1 model); [OperationContract] [FaultContract(typeof(DataFault))] string GetMoreData(DataModel2 model); } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Service Implementation/Behaviour public class Service1 : IService1 { public string GetData(DataModel1 model) { return string.Format("Some Field was: {0} and another field was {1}", model.SomeField,model.AnotherField); } public string GetMoreData(DataModel2 model) { return string.Format("Name: {0}, age: {1}", model.Name, model.Age); } } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Configuration File <system.serviceModel> <services> <service name="SingleWSDL_WcfService.Service1" behaviorConfiguration="SingleWSDL_WcfService.Service1Behavior"> <!-- ...std/default data omitted for brevity..... --> <endpoint address ="" binding="wsHttpBinding" contract="SingleWSDL_WcfService.IService1" > ....... </services> <behaviors> <serviceBehaviors> <behavior name="SingleWSDL_WcfService.Service1Behavior"> ........ </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } When WCF is asked to produce a WSDL for this service, it will produce a file that looks something like this (note: some sections omitted for brevity): <?xml version="1.0" encoding="utf-8" ?> - <wsdl:definitions name="Service1" targetNamespace="http://tempuri.org/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" ...... namespace definitions omitted for brevity + <wsp:Policy wsu:Id="WSHttpBinding_IService1_policy"> ... multiple policy items omitted for brevity </wsp:Policy> - <wsdl:types> - <xsd:schema targetNamespace="http://tempuri.org/Imports"> <xsd:import schemaLocation="http://localhost:2370/HostingSite/Service-default.svc?xsd=xsd0" namespace="http://tempuri.org/" /> <xsd:import schemaLocation="http://localhost:2370/HostingSite/Service-default.svc?xsd=xsd3" namespace="Http://SingleWSDL/Fault" /> <xsd:import schemaLocation="http://localhost:2370/HostingSite/Service-default.svc?xsd=xsd1" namespace="http://schemas.microsoft.com/2003/10/Serialization/" /> <xsd:import schemaLocation="http://localhost:2370/HostingSite/Service-default.svc?xsd=xsd2" namespace="http://SingleWSDL/Model1" /> <xsd:import schemaLocation="http://localhost:2370/HostingSite/Service-default.svc?xsd=xsd4" namespace="http://SingleWSDL/Model2" /> </xsd:schema> </wsdl:types> + <wsdl:message name="IService1_GetData_InputMessage"> .... </wsdl:message> - <wsdl:operation name="GetData"> ..... </wsdl:operation> - <wsdl:service name="Service1"> ....... </wsdl:service> </wsdl:definitions> The above snippet from the WSDL shows the external links and references that are generated by WCF for a relatively simple service. Note the xsd:import statements that reference external XSD definitions which are also generated by WCF. In order to get WCF to produce a single WSDL file, we first need to follow some good practices when it comes to WCF service definitions. Step 1: Define a namespace for your service contract. [ServiceContract(Namespace="http://SingleWSDL/Service1")] public interface IService1 { ...... } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Normally you would not use a literal string and may instead define a constant to use in your own application for the namespace. When this is applied and we generate the WSDL, we get the following statement inserted into the document: <wsdl:import namespace="http://SingleWSDL/Service1" location="http://localhost:2370/HostingSite/Service-default.svc?wsdl=wsdl0" /> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } All the previous imports have gone. If we follow this link, we will see that the XSD imports are now in this external WSDL file. Not really any benefit for our purposes. Step 2: Define a namespace for your service behaviour [ServiceBehavior(Namespace = "http://SingleWSDL/Service1")] public class Service1 : IService1 { ...... } As you can see, the namespace of the service behaviour should be the same as the service contract interface to which it implements. Failure to do these tasks will cause WCF to emit its default http://tempuri.org namespace all over the place and cause WCF to still generate import statements. This is also true if the namespace of the contract and behaviour differ. If you define one and not the other, defaults kick in, and youll find extra imports generated. While each of the previous 2 steps wont cause any less import statements to be generated, you will notice that namespace definitions within the WSDL have identical, well defined names. Step 3: Define a binding namespace In the configuration file, modify the endpoint configuration line item to iunclude a bindingNamespace attribute which is the same as that defined on the service behaviour and service contract <endpoint address="" binding="wsHttpBinding" contract="SingleWSDL_WcfService.IService1" bindingNamespace="http://SingleWSDL/Service1"> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } However, this does not completely solve the issue. What this will do is remove the WSDL import statements like this one: <wsdl:import namespace="http://SingleWSDL/Service1" location="http://localhost:2370/HostingSite/Service-default.svc?wsdl" /> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } from the generated WSDL. Finally. the magic. Step 4: Use a custom endpoint behaviour to read in external imports and include in the main WSDL output. In order to force WCF to output a single WSDL with all the required definitions, we need to define a custom WSDL Export extension that can be applied to any endpoints. This requires implementing the IWsdlExportExtension and IEndpointBehavior interfaces and then reading in any imported schemas, and adding that output to the main, flattened WSDL to be output. Sounds like fun right..? Hmmm well maybe not. This step sounds a little hairy, but its actually quite easy thanks to some kind individuals who have already done this for us. As far as I know, there are 2 available implementations that we can easily use to perform the import and WSDL flattening.  WCFExtras which is on codeplex and FlatWsdl by Thinktecture. Both implementations actually do exactly the same thing with the imports and provide an endpoint behaviour, however FlatWsdl does a little more work for us by providing a ServiceHostFactory that we can use which automatically attaches the requisite behaviour to our endpoints for us. To use this in an IIS hosted service, we can modify the .SVC file to specify this ne factory to use like so: <%@ ServiceHost Language="C#" Debug="true" Service="SingleWSDL_WcfService.Service1" Factory="Thinktecture.ServiceModel.Extensions.Description.FlatWsdlServiceHostFactory" %> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Within a service application or another form of executable such as a console app, we can simply create an instance of the custom service host and open it as we normally would as shown here: FlatWsdlServiceHost host = new FlatWsdlServiceHost(typeof(Service1)); host.Open(); And we are done. WCF will now generate one single WSDL file that contains all he WSDL imports and data/XSD imports. You can download the full source code for this sample from here Hope this has helped you. Note: Please note that I have not extensively tested this in a number of different scenarios so no guarantees there.Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How to prevent Android bluetooth RFCOMM connection from dying immediately after .connect()?

  - by Gilead

  I'm trying to connect to a Zeemote (http://zeemote.com/) gaming controller from Moto Droid running 2.0.1 firmware. The test application below does connect to the device (LED flashes) but connection is dropped immediately after that. I can connect to the device perfectly fine using bluez tools (log attached as well). I'm quite at a loss here, I work on it for so long that I ran out of ideas so any help would be very much appreciated. Thanks, Max =========================================== Code: public class ZeeTest extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); try { test(); } catch (IOException e) { e.printStackTrace(); } } public void test() throws IOException { BluetoothDevice zee = BluetoothAdapter.getDefaultAdapter(). getRemoteDevice("00:1C:4D:02:A6:55"); Log.d("ZeeTest", "++++ Creating socket"); BluetoothSocket sock = zee.createRfcommSocketToServiceRecord( UUID.fromString("8e1f0cf7-508f-4875-b62c-fbb67fd34812")); Log.d("ZeeTest", "++++ Connecting"); sock.connect(); Log.d("ZeeTest", "++++ Connected"); final InputStream in = sock.getInputStream(); new Thread() { @Override public void run() { byte[] buffer = new byte[32]; int bytes = 0; int x = 0; Log.d("ZeeTest", "++++ Listening..."); while (x < 200) { x++; try { bytes = in.read(buffer); Log.d("ZeeTest", "++++ Read "+ bytes +" bytes"); } catch (IOException e) { // java.io.IOException: Software caused connection abort if (x % 50 == 0) { Log.d("ZeeTest", "Tried "+ x +" times ("+ bytes +")"); } try { Thread.sleep(100); } catch (InterruptedException ie) {} } } Log.d("ZeeTest", "++++ Done: thread exit"); } }.start(); Log.d("ZeeTest", "++++ Done: test()"); } } =========================================== Log: I/ActivityManager( 1169): Start proc zee.test for activity zee.test/.ZeeTest: pid=4294 uid=10084 gids={3002, 3001, 3003} I/dalvikvm( 4294): Debugger thread not active, ignoring DDM send (t=0x41504e4d l=38) D/dalvikvm( 4287): LinearAlloc 0x0 used 640700 of 5242880 (12%) I/dalvikvm( 4294): Debugger thread not active, ignoring DDM send (t=0x41504e4d l=20) D/ZeeTest ( 4294): ++++ Creating socket D/ZeeTest ( 4294): ++++ Connecting E/BluetoothEventLoop.cpp( 1169): event_filter: Received signal org.bluez.Device:PropertyChanged from /org/bluez/1240/hci0/dev_00_1C_4D_02_A6_55 I/usbd ( 1068): process_usb_uevent_message(): buffer = add@/devices/virtual/bluetooth/hci0/hci0:1 I/usbd ( 1068): main(): call select(...) E/BluetoothEventLoop.cpp( 1169): event_filter: Received signal org.bluez.Adapter:DeviceFound from /org/bluez/1240/hci0 V/BluetoothEventRedirector( 1242): Received android.bluetooth.device.action.FOUND V/BluetoothEventRedirector( 1242): Received android.bleutooth.device.action.UUID D/ZeeTest ( 4294): ++++ Connected D/ZeeTest ( 4294): ++++ Done: test() D/ZeeTest ( 4294): ++++ Listening... I/ActivityManager( 1169): Displayed activity zee.test/.ZeeTest: 2296 ms (total 2296 ms) E/BluetoothEventLoop.cpp( 1169): event_filter: Received signal org.bluez.Device:PropertyChanged from /org/bluez/1240/hci0/dev_00_1C_4D_02_A6_55 I/usbd ( 1068): process_usb_uevent_message(): buffer = remove@/devices/virtual/bluetooth/hci0/hci0:1 I/usbd ( 1068): main(): call select(...) V/BluetoothEventRedirector( 1242): Received android.bleutooth.device.action.UUID D/ZeeTest ( 4294): Tried 50 times (0) D/ZeeTest ( 4294): Tried 100 times (0) D/ZeeTest ( 4294): Tried 150 times (0) D/ZeeTest ( 4294): Tried 200 times (0) D/ZeeTest ( 4294): ++++ Done: thread exit =========================================== Terminal log: $ sdptool browse Inquiring ... Browsing 00:1C:4D:02:A6:55 ... $ sdptool records 00:1C:4D:02:A6:55 Service Name: Zeemote Service RecHandle: 0x10015 Service Class ID List: UUID 128: 8e1f0cf7-508f-4875-b62c-fbb67fd34812 Protocol Descriptor List: "L2CAP" (0x0100) "RFCOMM" (0x0003) Channel: 1 Language Base Attr List: code_ISO639: 0x656e encoding: 0x6a base_offset: 0x100 $ rfcomm connect /dev/tty10 00:1C:4D:02:A6:55 Connected /dev/rfcomm0 to 00:1C:4D:02:A6:55 on channel 1 Press CTRL-C for hangup # rfcomm show /dev/tty10 rfcomm0: 00:1F:3A:E4:C8:40 - 00:1C:4D:02:A6:55 channel 1 connected [reuse-dlc release-on-hup tty-attached] # cat /dev/tty10 (nothing here) # hcidump HCI sniffer - Bluetooth packet analyzer ver 1.42 device: hci0 snap_len: 1028 filter: 0xffffffff < HCI Command: Create Connection (0x01|0x0005) plen 13 > HCI Event: Command Status (0x0f) plen 4 > HCI Event: Connect Complete (0x03) plen 11 < HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2 > HCI Event: Read Remote Supported Features (0x0b) plen 11 < ACL data: handle 11 flags 0x02 dlen 10 L2CAP(s): Info req: type 2 > HCI Event: Command Status (0x0f) plen 4 > HCI Event: Page Scan Repetition Mode Change (0x20) plen 7 > HCI Event: Max Slots Change (0x1b) plen 3 < HCI Command: Remote Name Request (0x01|0x0019) plen 10 > HCI Event: Command Status (0x0f) plen 4 > ACL data: handle 11 flags 0x02 dlen 16 L2CAP(s): Info rsp: type 2 result 0 Extended feature mask 0x0000 < ACL data: handle 11 flags 0x02 dlen 12 L2CAP(s): Connect req: psm 3 scid 0x0040 > HCI Event: Number of Completed Packets (0x13) plen 5 > ACL data: handle 11 flags 0x02 dlen 16 L2CAP(s): Connect rsp: dcid 0x04fb scid 0x0040 result 1 status 2 Connection pending - Authorization pending > HCI Event: Remote Name Req Complete (0x07) plen 255 > ACL data: handle 11 flags 0x02 dlen 16 L2CAP(s): Connect rsp: dcid 0x04fb scid 0x0040 result 0 status 0 Connection successful < ACL data: handle 11 flags 0x02 dlen 16 L2CAP(s): Config req: dcid 0x04fb flags 0x00 clen 4 MTU 1013 (events are properly received using bluez)

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• Iphone SDK - adding UITableView to UIView

  - by Shashi

  Hi, I am trying to learn how to use different views, for this sample test app, i have a login page, upon successful logon, the user is redirected to a table view and then upon selection of an item in the table view, the user is directed to a third page showing details of the item. the first page works just fine, but the problem occurs when i go to the second page, the table shown doesn't have title and i cannot add title or toolbar or anything other than the content of the tables themselves. and when i click on the item, needless to say nothing happens. no errors as well. i am fairly new to programming and have always worked on Java but never on C(although i have some basic knowledge of C) and Objective C is new to me. Here is the code. import @interface NavigationTestAppDelegate : NSObject { UIWindow *window; UIViewController *viewController; IBOutlet UITextField *username; IBOutlet UITextField *password; IBOutlet UILabel *loginError; //UINavigationController *navigationController; } @property (nonatomic, retain) IBOutlet UIViewController *viewController; @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet UITextField *username; @property (nonatomic, retain) IBOutlet UITextField *password; @property (nonatomic, retain) IBOutlet UILabel *loginError; -(IBAction) login; -(IBAction) hideKeyboard: (id) sender; @end import "NavigationTestAppDelegate.h" import "RootViewController.h" @implementation NavigationTestAppDelegate @synthesize window; @synthesize viewController; @synthesize username; @synthesize password; @synthesize loginError; pragma mark - pragma mark Application lifecycle -(IBAction) hideKeyboard: (id) sender{ [sender resignFirstResponder]; } (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after app launch //RootViewController *rootViewController = [[RootViewController alloc] init]; //[window addSubview:[navigationController view]]; [window addSubview:[viewController view]]; [window makeKeyAndVisible]; return YES; } -(IBAction) login { RootViewController *rootViewController = [[RootViewController alloc] init]; //NSString *user = [[NSString alloc] username. if([username.text isEqualToString:@"test"]&&[password.text isEqualToString:@"test"]){ [window addSubview:[rootViewController view]]; //[window addSubview:[navigationController view]]; [window makeKeyAndVisible]; //rootViewController.awakeFromNib; } else { loginError.text = @"LOGIN ERROR"; [window addSubview:[viewController view]]; [window makeKeyAndVisible]; } } (void)applicationWillTerminate:(UIApplication *)application { // Save data if appropriate } pragma mark - pragma mark Memory management (void)dealloc { //[navigationController release]; [viewController release]; [window release]; [super dealloc]; } @end import @interface RootViewController : UITableViewController { IBOutlet NSMutableArray *views; } @property (nonatomic, retain) IBOutlet NSMutableArray * views; @end // // RootViewController.m // NavigationTest // // Created by guest on 4/23/10. // Copyright MyCompanyName 2010. All rights reserved. // import "RootViewController.h" import "OpportunityOne.h" @implementation RootViewController @synthesize views; //@synthesize navigationViewController; pragma mark - pragma mark View lifecycle (void)viewDidLoad { views = [ [NSMutableArray alloc] init]; OpportunityOne *opportunityOneController; for (int i=1; i<=20; i++) { opportunityOneController = [[OpportunityOne alloc] init]; opportunityOneController.title = [[NSString alloc] initWithFormat:@"Opportunity %i",i]; [views addObject:[NSDictionary dictionaryWithObjectsAndKeys: [[NSString alloc] initWithFormat:@"Opportunity %i",i], @ "title", opportunityOneController, @"controller", nil]]; self.title=@"GPS"; } /*UIBarButtonItem *temporaryBarButtonItem = [[UIBarButtonItem alloc] init]; temporaryBarButtonItem.title = @"Back"; self.navigationItem.backBarButtonItem = temporaryBarButtonItem; [temporaryBarButtonItem release]; */ //self.title =@"Global Platform for Sales"; [super viewDidLoad]; //[temporaryBarButtonItem release]; //[opportunityOneController release]; // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem; } pragma mark - pragma mark Table view data source // Customize the number of sections in the table view. - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } // Customize the number of rows in the table view. - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [views count]; } // Customize the appearance of table view cells. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } // Configure the cell. cell.textLabel.text = [[views objectAtIndex:indexPath.row] objectForKey:@"title"]; return cell; } pragma mark - pragma mark Table view delegate (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { //UIViewController *targetViewController = [[views objectAtIndex:indexPath.row] objectForKey:@"controller"]; UIViewController *targetViewController = [[views objectAtIndex:indexPath.row] objectForKey:@"controller"]; [[self navigationController] pushViewController:targetViewController animated:YES]; } pragma mark - pragma mark Memory management (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Relinquish ownership any cached data, images, etc that aren't in use. } (void)viewDidUnload { // Relinquish ownership of anything that can be recreated in viewDidLoad or on demand. // For example: self.myOutlet = nil; } (void)dealloc { [views release]; [super dealloc]; } @end Wow, i was finding it real hard to post the code. i apologize for the bad formatting, but i just couldn't get past the formatting rules for this text editor. Thanks, Shashi

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• Inheritance Mapping Strategies with Entity Framework Code First CTP5 Part 1: Table per Hierarchy (TPH)

  - by mortezam

  A simple strategy for mapping classes to database tables might be “one table for every entity persistent class.” This approach sounds simple enough and, indeed, works well until we encounter inheritance. Inheritance is such a visible structural mismatch between the object-oriented and relational worlds because object-oriented systems model both “is a” and “has a” relationships. SQL-based models provide only "has a" relationships between entities; SQL database management systems don’t support type inheritance—and even when it’s available, it’s usually proprietary or incomplete. There are three different approaches to representing an inheritance hierarchy: Table per Hierarchy (TPH): Enable polymorphism by denormalizing the SQL schema, and utilize a type discriminator column that holds type information. Table per Type (TPT): Represent "is a" (inheritance) relationships as "has a" (foreign key) relationships. Table per Concrete class (TPC): Discard polymorphism and inheritance relationships completely from the SQL schema.I will explain each of these strategies in a series of posts and this one is dedicated to TPH. In this series we'll deeply dig into each of these strategies and will learn about "why" to choose them as well as "how" to implement them. Hopefully it will give you a better idea about which strategy to choose in a particular scenario. Inheritance Mapping with Entity Framework Code FirstAll of the inheritance mapping strategies that we discuss in this series will be implemented by EF Code First CTP5. The CTP5 build of the new EF Code First library has been released by ADO.NET team earlier this month. EF Code-First enables a pretty powerful code-centric development workflow for working with data. I’m a big fan of the EF Code First approach, and I’m pretty excited about a lot of productivity and power that it brings. When it comes to inheritance mapping, not only Code First fully supports all the strategies but also gives you ultimate flexibility to work with domain models that involves inheritance. The fluent API for inheritance mapping in CTP5 has been improved a lot and now it's more intuitive and concise in compare to CTP4. A Note For Those Who Follow Other Entity Framework ApproachesIf you are following EF's "Database First" or "Model First" approaches, I still recommend to read this series since although the implementation is Code First specific but the explanations around each of the strategies is perfectly applied to all approaches be it Code First or others. A Note For Those Who are New to Entity Framework and Code-FirstIf you choose to learn EF you've chosen well. If you choose to learn EF with Code First you've done even better. To get started, you can find a great walkthrough by Scott Guthrie here and another one by ADO.NET team here. In this post, I assume you already setup your machine to do Code First development and also that you are familiar with Code First fundamentals and basic concepts. You might also want to check out my other posts on EF Code First like Complex Types and Shared Primary Key Associations. A Top Down Development ScenarioThese posts take a top-down approach; it assumes that you’re starting with a domain model and trying to derive a new SQL schema. Therefore, we start with an existing domain model, implement it in C# and then let Code First create the database schema for us. However, the mapping strategies described are just as relevant if you’re working bottom up, starting with existing database tables. I’ll show some tricks along the way that help you dealing with nonperfect table layouts. Let’s start with the mapping of entity inheritance. -- The Domain ModelIn our domain model, we have a BillingDetail base class which is abstract (note the italic font on the UML class diagram below). We do allow various billing types and represent them as subclasses of BillingDetail class. As for now, we support CreditCard and BankAccount: Implement the Object Model with Code First As always, we start with the POCO classes. Note that in our DbContext, I only define one DbSet for the base class which is BillingDetail. Code First will find the other classes in the hierarchy based on Reachability Convention. public abstract class BillingDetail  {     public int BillingDetailId { get; set; }     public string Owner { get; set; }             public string Number { get; set; } } public class BankAccount : BillingDetail {     public string BankName { get; set; }     public string Swift { get; set; } } public class CreditCard : BillingDetail {     public int CardType { get; set; }                     public string ExpiryMonth { get; set; }     public string ExpiryYear { get; set; } } public class InheritanceMappingContext : DbContext {     public DbSet<BillingDetail> BillingDetails { get; set; } } This object model is all that is needed to enable inheritance with Code First. If you put this in your application you would be able to immediately start working with the database and do CRUD operations. Before going into details about how EF Code First maps this object model to the database, we need to learn about one of the core concepts of inheritance mapping: polymorphic and non-polymorphic queries. Polymorphic Queries LINQ to Entities and EntitySQL, as object-oriented query languages, both support polymorphic queries—that is, queries for instances of a class and all instances of its subclasses, respectively. For example, consider the following query: IQueryable<BillingDetail> linqQuery = from b in context.BillingDetails select b; List<BillingDetail> billingDetails = linqQuery.ToList(); Or the same query in EntitySQL: string eSqlQuery = @"SELECT VAlUE b FROM BillingDetails AS b"; ObjectQuery<BillingDetail> objectQuery = ((IObjectContextAdapter)context).ObjectContext                                                                          .CreateQuery<BillingDetail>(eSqlQuery); List<BillingDetail> billingDetails = objectQuery.ToList(); linqQuery and eSqlQuery are both polymorphic and return a list of objects of the type BillingDetail, which is an abstract class but the actual concrete objects in the list are of the subtypes of BillingDetail: CreditCard and BankAccount. Non-polymorphic QueriesAll LINQ to Entities and EntitySQL queries are polymorphic which return not only instances of the specific entity class to which it refers, but all subclasses of that class as well. On the other hand, Non-polymorphic queries are queries whose polymorphism is restricted and only returns instances of a particular subclass. In LINQ to Entities, this can be specified by using OfType<T>() Method. For example, the following query returns only instances of BankAccount: IQueryable<BankAccount> query = from b in context.BillingDetails.OfType<BankAccount>() select b; EntitySQL has OFTYPE operator that does the same thing: string eSqlQuery = @"SELECT VAlUE b FROM OFTYPE(BillingDetails, Model.BankAccount) AS b"; In fact, the above query with OFTYPE operator is a short form of the following query expression that uses TREAT and IS OF operators: string eSqlQuery = @"SELECT VAlUE TREAT(b as Model.BankAccount)                       FROM BillingDetails AS b                       WHERE b IS OF(Model.BankAccount)"; (Note that in the above query, Model.BankAccount is the fully qualified name for BankAccount class. You need to change "Model" with your own namespace name.) Table per Class Hierarchy (TPH)An entire class hierarchy can be mapped to a single table. This table includes columns for all properties of all classes in the hierarchy. The concrete subclass represented by a particular row is identified by the value of a type discriminator column. You don’t have to do anything special in Code First to enable TPH. It's the default inheritance mapping strategy: This mapping strategy is a winner in terms of both performance and simplicity. It’s the best-performing way to represent polymorphism—both polymorphic and nonpolymorphic queries perform well—and it’s even easy to implement by hand. Ad-hoc reporting is possible without complex joins or unions. Schema evolution is straightforward. Discriminator Column As you can see in the DB schema above, Code First has to add a special column to distinguish between persistent classes: the discriminator. This isn’t a property of the persistent class in our object model; it’s used internally by EF Code First. By default, the column name is "Discriminator", and its type is string. The values defaults to the persistent class names —in this case, “BankAccount” or “CreditCard”. EF Code First automatically sets and retrieves the discriminator values. TPH Requires Properties in SubClasses to be Nullable in the Database TPH has one major problem: Columns for properties declared by subclasses will be nullable in the database. For example, Code First created an (INT, NULL) column to map CardType property in CreditCard class. However, in a typical mapping scenario, Code First always creates an (INT, NOT NULL) column in the database for an int property in persistent class. But in this case, since BankAccount instance won’t have a CardType property, the CardType field must be NULL for that row so Code First creates an (INT, NULL) instead. If your subclasses each define several non-nullable properties, the loss of NOT NULL constraints may be a serious problem from the point of view of data integrity. TPH Violates the Third Normal FormAnother important issue is normalization. We’ve created functional dependencies between nonkey columns, violating the third normal form. Basically, the value of Discriminator column determines the corresponding values of the columns that belong to the subclasses (e.g. BankName) but Discriminator is not part of the primary key for the table. As always, denormalization for performance can be misleading, because it sacrifices long-term stability, maintainability, and the integrity of data for immediate gains that may be also achieved by proper optimization of the SQL execution plans (in other words, ask your DBA). Generated SQL QueryLet's take a look at the SQL statements that EF Code First sends to the database when we write queries in LINQ to Entities or EntitySQL. For example, the polymorphic query for BillingDetails that you saw, generates the following SQL statement: SELECT  [Extent1].[Discriminator] AS [Discriminator],  [Extent1].[BillingDetailId] AS [BillingDetailId],  [Extent1].[Owner] AS [Owner],  [Extent1].[Number] AS [Number],  [Extent1].[BankName] AS [BankName],  [Extent1].[Swift] AS [Swift],  [Extent1].[CardType] AS [CardType],  [Extent1].[ExpiryMonth] AS [ExpiryMonth],  [Extent1].[ExpiryYear] AS [ExpiryYear] FROM [dbo].[BillingDetails] AS [Extent1] WHERE [Extent1].[Discriminator] IN ('BankAccount','CreditCard') Or the non-polymorphic query for the BankAccount subclass generates this SQL statement: SELECT  [Extent1].[BillingDetailId] AS [BillingDetailId],  [Extent1].[Owner] AS [Owner],  [Extent1].[Number] AS [Number],  [Extent1].[BankName] AS [BankName],  [Extent1].[Swift] AS [Swift] FROM [dbo].[BillingDetails] AS [Extent1] WHERE [Extent1].[Discriminator] = 'BankAccount' Note how Code First adds a restriction on the discriminator column and also how it only selects those columns that belong to BankAccount entity. Change Discriminator Column Data Type and Values With Fluent API Sometimes, especially in legacy schemas, you need to override the conventions for the discriminator column so that Code First can work with the schema. The following fluent API code will change the discriminator column name to "BillingDetailType" and the values to "BA" and "CC" for BankAccount and CreditCard respectively: protected override void OnModelCreating(System.Data.Entity.ModelConfiguration.ModelBuilder modelBuilder) {     modelBuilder.Entity<BillingDetail>()                 .Map<BankAccount>(m => m.Requires("BillingDetailType").HasValue("BA"))                 .Map<CreditCard>(m => m.Requires("BillingDetailType").HasValue("CC")); } Also, changing the data type of discriminator column is interesting. In the above code, we passed strings to HasValue method but this method has been defined to accepts a type of object: public void HasValue(object value); Therefore, if for example we pass a value of type int to it then Code First not only use our desired values (i.e. 1 & 2) in the discriminator column but also changes the column type to be (INT, NOT NULL): modelBuilder.Entity<BillingDetail>()             .Map<BankAccount>(m => m.Requires("BillingDetailType").HasValue(1))             .Map<CreditCard>(m => m.Requires("BillingDetailType").HasValue(2)); SummaryIn this post we learned about Table per Hierarchy as the default mapping strategy in Code First. The disadvantages of the TPH strategy may be too serious for your design—after all, denormalized schemas can become a major burden in the long run. Your DBA may not like it at all. In the next post, we will learn about Table per Type (TPT) strategy that doesn’t expose you to this problem. References ADO.NET team blog Java Persistence with Hibernate book a { text-decoration: none; } a:visited { color: Blue; } .title { padding-bottom: 5px; font-family: Segoe UI; font-size: 11pt; font-weight: bold; padding-top: 15px; } .code, .typeName { font-family: consolas; } .typeName { color: #2b91af; } .padTop5 { padding-top: 5px; } .padTop10 { padding-top: 10px; } p.MsoNormal { margin-top: 0in; margin-right: 0in; margin-bottom: 10.0pt; margin-left: 0in; line-height: 115%; font-size: 11.0pt; font-family: "Calibri" , "sans-serif"; }

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• [OpenGL ES - Android] Better way to generate tiles

  - by Inoe

  Hi ! I'll start by saying that i'm REALLY new to OpenGL ES (I started yesterday =), but I do have some Java and other languages experience. I've looked a lot of tutorials, of course Nehe's ones and my work is mainly based on that. As a test, I started creating a "tile generator" in order to create a small Zelda-like game (just moving a dude in a textured square would be awsome :p). So far, I have achieved a working tile generator, I define a char map[][] array to store wich tile is on : private char[][] map = { {0, 0, 20, 11, 11, 11, 11, 4, 0, 0}, {0, 20, 16, 12, 12, 12, 12, 7, 4, 0}, {20, 16, 17, 13, 13, 13, 13, 9, 7, 4}, {21, 24, 18, 14, 14, 14, 14, 8, 5, 1}, {21, 22, 25, 15, 15, 15, 15, 6, 2, 1}, {21, 22, 23, 0, 0, 0, 0, 3, 2, 1}, {21, 22, 23, 0, 0, 0, 0, 3, 2, 1}, {26, 0, 0, 0, 0, 0, 0, 3, 2, 1}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 1} }; It's working but I'm no happy with it, I'm sure there is a beter way to do those things : 1) Loading Textures : I create an ugly looking array containing the tiles I want to use on that map : private int[] textures = { R.drawable.herbe, //0 R.drawable.murdroite_haut, //1 R.drawable.murdroite_milieu, //2 R.drawable.murdroite_bas, //3 R.drawable.angledroitehaut_haut, //4 R.drawable.angledroitehaut_milieu, //5 }; (I cutted this on purpose, I currently load 27 tiles) All of theses are stored in the drawable folder, each one is a 16*16 tile. I then use this array to generate the textures and store them in a HashMap for a later use : int[] tmp_tex = new int[textures.length]; gl.glGenTextures(textures.length, tmp_tex, 0); texturesgen = tmp_tex; //Store the generated names in texturesgen for(int i=0; i < textures.length; i++) { //Bitmap bmp = BitmapFactory.decodeResource(context.getResources(), textures[i]); InputStream is = context.getResources().openRawResource(textures[i]); Bitmap bitmap = null; try { //BitmapFactory is an Android graphics utility for images bitmap = BitmapFactory.decodeStream(is); } finally { //Always clear and close try { is.close(); is = null; } catch (IOException e) { } } // Get a new texture name // Load it up this.textureMap.put(new Integer(textures[i]),new Integer(i)); int tex = tmp_tex[i]; gl.glBindTexture(GL10.GL_TEXTURE_2D, tex); //Create Nearest Filtered Texture gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR); //Different possible texture parameters, e.g. GL10.GL_CLAMP_TO_EDGE gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_REPEAT); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_REPEAT); //Use the Android GLUtils to specify a two-dimensional texture image from our bitmap GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0); bitmap.recycle(); } I'm quite sure there is a better way to handle that... I just was unable to figure it. If someone has an idea, i'm all ears. 2) Drawing the tiles What I did was create a single square and a single texture map : /** The initial vertex definition */ private float vertices[] = { -1.0f, -1.0f, 0.0f, //Bottom Left 1.0f, -1.0f, 0.0f, //Bottom Right -1.0f, 1.0f, 0.0f, //Top Left 1.0f, 1.0f, 0.0f //Top Right }; private float texture[] = { //Mapping coordinates for the vertices 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f }; Then, in my draw function, I loop through the map to define the texture to use (after pointing to and enabling the buffers) : for(int y = 0; y < Y; y++){ for(int x = 0; x < X; x++){ tile = map[y][x]; try { //Get the texture from the HashMap int textureid = ((Integer) this.textureMap.get(new Integer(textures[tile]))).intValue(); gl.glBindTexture(GL10.GL_TEXTURE_2D, this.texturesgen[textureid]); } catch(Exception e) { return; } //Draw the vertices as triangle strip gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, vertices.length / 3); gl.glTranslatef(2.0f, 0.0f, 0.0f); //A square takes 2x so I move +2x before drawing the next tile } gl.glTranslatef(-(float)(2*X), -2.0f, 0.0f); //Go back to the begining of the map X-wise and move 2y down before drawing the next line } This works great by I really think that on a 1000*1000 or more map, it will be lagging as hell (as a reminder, this is a typical Zelda world map : http://vgmaps.com/Atlas/SuperNES/LegendOfZelda-ALinkToThePast-LightWorld.png ). I've read things about Vertex Buffer Object and DisplayList but I couldn't find a good tutorial and nodoby seems to be OK on wich one is the best / has the better support (T1 and Nexus One are ages away). I think that's it, I've putted a lot of code but I think it helps. Thanks in advance !

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• Inheritance Mapping Strategies with Entity Framework Code First CTP5: Part 3 – Table per Concrete Type (TPC) and Choosing Strategy Guidelines

  - by mortezam

  This is the third (and last) post in a series that explains different approaches to map an inheritance hierarchy with EF Code First. I've described these strategies in previous posts: Part 1 – Table per Hierarchy (TPH) Part 2 – Table per Type (TPT)In today’s blog post I am going to discuss Table per Concrete Type (TPC) which completes the inheritance mapping strategies supported by EF Code First. At the end of this post I will provide some guidelines to choose an inheritance strategy mainly based on what we've learned in this series. TPC and Entity Framework in the Past Table per Concrete type is somehow the simplest approach suggested, yet using TPC with EF is one of those concepts that has not been covered very well so far and I've seen in some resources that it was even discouraged. The reason for that is just because Entity Data Model Designer in VS2010 doesn't support TPC (even though the EF runtime does). That basically means if you are following EF's Database-First or Model-First approaches then configuring TPC requires manually writing XML in the EDMX file which is not considered to be a fun practice. Well, no more. You'll see that with Code First, creating TPC is perfectly possible with fluent API just like other strategies and you don't need to avoid TPC due to the lack of designer support as you would probably do in other EF approaches. Table per Concrete Type (TPC)In Table per Concrete type (aka Table per Concrete class) we use exactly one table for each (nonabstract) class. All properties of a class, including inherited properties, can be mapped to columns of this table, as shown in the following figure: As you can see, the SQL schema is not aware of the inheritance; effectively, we’ve mapped two unrelated tables to a more expressive class structure. If the base class was concrete, then an additional table would be needed to hold instances of that class. I have to emphasize that there is no relationship between the database tables, except for the fact that they share some similar columns. TPC Implementation in Code First Just like the TPT implementation, we need to specify a separate table for each of the subclasses. We also need to tell Code First that we want all of the inherited properties to be mapped as part of this table. In CTP5, there is a new helper method on EntityMappingConfiguration class called MapInheritedProperties that exactly does this for us. Here is the complete object model as well as the fluent API to create a TPC mapping: public abstract class BillingDetail {     public int BillingDetailId { get; set; }     public string Owner { get; set; }     public string Number { get; set; } }          public class BankAccount : BillingDetail {     public string BankName { get; set; }     public string Swift { get; set; } }          public class CreditCard : BillingDetail {     public int CardType { get; set; }     public string ExpiryMonth { get; set; }     public string ExpiryYear { get; set; } }      public class InheritanceMappingContext : DbContext {     public DbSet<BillingDetail> BillingDetails { get; set; }              protected override void OnModelCreating(ModelBuilder modelBuilder)     {         modelBuilder.Entity<BankAccount>().Map(m =>         {             m.MapInheritedProperties();             m.ToTable("BankAccounts");         });         modelBuilder.Entity<CreditCard>().Map(m =>         {             m.MapInheritedProperties();             m.ToTable("CreditCards");         });                 } } The Importance of EntityMappingConfiguration ClassAs a side note, it worth mentioning that EntityMappingConfiguration class turns out to be a key type for inheritance mapping in Code First. Here is an snapshot of this class: namespace System.Data.Entity.ModelConfiguration.Configuration.Mapping {     public class EntityMappingConfiguration<TEntityType> where TEntityType : class     {         public ValueConditionConfiguration Requires(string discriminator);         public void ToTable(string tableName);         public void MapInheritedProperties();     } } As you have seen so far, we used its Requires method to customize TPH. We also used its ToTable method to create a TPT and now we are using its MapInheritedProperties along with ToTable method to create our TPC mapping. TPC Configuration is Not Done Yet!We are not quite done with our TPC configuration and there is more into this story even though the fluent API we saw perfectly created a TPC mapping for us in the database. To see why, let's start working with our object model. For example, the following code creates two new objects of BankAccount and CreditCard types and tries to add them to the database: using (var context = new InheritanceMappingContext()) {     BankAccount bankAccount = new BankAccount();     CreditCard creditCard = new CreditCard() { CardType = 1 };                      context.BillingDetails.Add(bankAccount);     context.BillingDetails.Add(creditCard);     context.SaveChanges(); } Running this code throws an InvalidOperationException with this message: The changes to the database were committed successfully, but an error occurred while updating the object context. The ObjectContext might be in an inconsistent state. Inner exception message: AcceptChanges cannot continue because the object's key values conflict with another object in the ObjectStateManager. Make sure that the key values are unique before calling AcceptChanges. The reason we got this exception is because DbContext.SaveChanges() internally invokes SaveChanges method of its internal ObjectContext. ObjectContext's SaveChanges method on its turn by default calls AcceptAllChanges after it has performed the database modifications. AcceptAllChanges method merely iterates over all entries in ObjectStateManager and invokes AcceptChanges on each of them. Since the entities are in Added state, AcceptChanges method replaces their temporary EntityKey with a regular EntityKey based on the primary key values (i.e. BillingDetailId) that come back from the database and that's where the problem occurs since both the entities have been assigned the same value for their primary key by the database (i.e. on both BillingDetailId = 1) and the problem is that ObjectStateManager cannot track objects of the same type (i.e. BillingDetail) with the same EntityKey value hence it throws. If you take a closer look at the TPC's SQL schema above, you'll see why the database generated the same values for the primary keys: the BillingDetailId column in both BankAccounts and CreditCards table has been marked as identity. How to Solve The Identity Problem in TPC As you saw, using SQL Server’s int identity columns doesn't work very well together with TPC since there will be duplicate entity keys when inserting in subclasses tables with all having the same identity seed. Therefore, to solve this, either a spread seed (where each table has its own initial seed value) will be needed, or a mechanism other than SQL Server’s int identity should be used. Some other RDBMSes have other mechanisms allowing a sequence (identity) to be shared by multiple tables, and something similar can be achieved with GUID keys in SQL Server. While using GUID keys, or int identity keys with different starting seeds will solve the problem but yet another solution would be to completely switch off identity on the primary key property. As a result, we need to take the responsibility of providing unique keys when inserting records to the database. We will go with this solution since it works regardless of which database engine is used. Switching Off Identity in Code First We can switch off identity simply by placing DatabaseGenerated attribute on the primary key property and pass DatabaseGenerationOption.None to its constructor. DatabaseGenerated attribute is a new data annotation which has been added to System.ComponentModel.DataAnnotations namespace in CTP5: public abstract class BillingDetail {     [DatabaseGenerated(DatabaseGenerationOption.None)]     public int BillingDetailId { get; set; }     public string Owner { get; set; }     public string Number { get; set; } } As always, we can achieve the same result by using fluent API, if you prefer that: modelBuilder.Entity<BillingDetail>()             .Property(p => p.BillingDetailId)             .HasDatabaseGenerationOption(DatabaseGenerationOption.None); Working With The Object Model Our TPC mapping is ready and we can try adding new records to the database. But, like I said, now we need to take care of providing unique keys when creating new objects: using (var context = new InheritanceMappingContext()) {     BankAccount bankAccount = new BankAccount()      {          BillingDetailId = 1                          };     CreditCard creditCard = new CreditCard()      {          BillingDetailId = 2,         CardType = 1     };                      context.BillingDetails.Add(bankAccount);     context.BillingDetails.Add(creditCard);     context.SaveChanges(); } Polymorphic Associations with TPC is Problematic The main problem with this approach is that it doesn’t support Polymorphic Associations very well. After all, in the database, associations are represented as foreign key relationships and in TPC, the subclasses are all mapped to different tables so a polymorphic association to their base class (abstract BillingDetail in our example) cannot be represented as a simple foreign key relationship. For example, consider the the domain model we introduced here where User has a polymorphic association with BillingDetail. This would be problematic in our TPC Schema, because if User has a many-to-one relationship with BillingDetail, the Users table would need a single foreign key column, which would have to refer both concrete subclass tables. This isn’t possible with regular foreign key constraints. Schema Evolution with TPC is Complex A further conceptual problem with this mapping strategy is that several different columns, of different tables, share exactly the same semantics. This makes schema evolution more complex. For example, a change to a base class property results in changes to multiple columns. It also makes it much more difficult to implement database integrity constraints that apply to all subclasses. Generated SQLLet's examine SQL output for polymorphic queries in TPC mapping. For example, consider this polymorphic query for all BillingDetails and the resulting SQL statements that being executed in the database: var query = from b in context.BillingDetails select b; Just like the SQL query generated by TPT mapping, the CASE statements that you see in the beginning of the query is merely to ensure columns that are irrelevant for a particular row have NULL values in the returning flattened table. (e.g. BankName for a row that represents a CreditCard type). TPC's SQL Queries are Union Based As you can see in the above screenshot, the first SELECT uses a FROM-clause subquery (which is selected with a red rectangle) to retrieve all instances of BillingDetails from all concrete class tables. The tables are combined with a UNION operator, and a literal (in this case, 0 and 1) is inserted into the intermediate result; (look at the lines highlighted in yellow.) EF reads this to instantiate the correct class given the data from a particular row. A union requires that the queries that are combined, project over the same columns; hence, EF has to pad and fill up nonexistent columns with NULL. This query will really perform well since here we can let the database optimizer find the best execution plan to combine rows from several tables. There is also no Joins involved so it has a better performance than the SQL queries generated by TPT where a Join is required between the base and subclasses tables. Choosing Strategy GuidelinesBefore we get into this discussion, I want to emphasize that there is no one single "best strategy fits all scenarios" exists. As you saw, each of the approaches have their own advantages and drawbacks. Here are some rules of thumb to identify the best strategy in a particular scenario: If you don’t require polymorphic associations or queries, lean toward TPC—in other words, if you never or rarely query for BillingDetails and you have no class that has an association to BillingDetail base class. I recommend TPC (only) for the top level of your class hierarchy, where polymorphism isn’t usually required, and when modification of the base class in the future is unlikely. If you do require polymorphic associations or queries, and subclasses declare relatively few properties (particularly if the main difference between subclasses is in their behavior), lean toward TPH. Your goal is to minimize the number of nullable columns and to convince yourself (and your DBA) that a denormalized schema won’t create problems in the long run. If you do require polymorphic associations or queries, and subclasses declare many properties (subclasses differ mainly by the data they hold), lean toward TPT. Or, depending on the width and depth of your inheritance hierarchy and the possible cost of joins versus unions, use TPC. By default, choose TPH only for simple problems. For more complex cases (or when you’re overruled by a data modeler insisting on the importance of nullability constraints and normalization), you should consider the TPT strategy. But at that point, ask yourself whether it may not be better to remodel inheritance as delegation in the object model (delegation is a way of making composition as powerful for reuse as inheritance). Complex inheritance is often best avoided for all sorts of reasons unrelated to persistence or ORM. EF acts as a buffer between the domain and relational models, but that doesn’t mean you can ignore persistence concerns when designing your classes. SummaryIn this series, we focused on one of the main structural aspect of the object/relational paradigm mismatch which is inheritance and discussed how EF solve this problem as an ORM solution. We learned about the three well-known inheritance mapping strategies and their implementations in EF Code First. Hopefully it gives you a better insight about the mapping of inheritance hierarchies as well as choosing the best strategy for your particular scenario. Happy New Year and Happy Code-Firsting! References ADO.NET team blog Java Persistence with Hibernate book a { color: #5A99FF; } a:visited { color: #5A99FF; } .title { padding-bottom: 5px; font-family: Segoe UI; font-size: 11pt; font-weight: bold; padding-top: 15px; } .code, .typeName { font-family: consolas; } .typeName { color: #2b91af; } .padTop5 { padding-top: 5px; } .padTop10 { padding-top: 10px; } .exception { background-color: #f0f0f0; font-style: italic; padding-bottom: 5px; padding-left: 5px; padding-top: 5px; padding-right: 5px; }

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• CodePlex Daily Summary for Thursday, March 01, 2012

  CodePlex Daily Summary for Thursday, March 01, 2012Popular ReleasesMetodología General Ajustada - MGA: 01.09.08: Cambios John: Cambios en el MDI: Habilitación del menú e ícono de Imprimir. Deshabilitación de menú Ayuda y opciones de Importar y Exportar del menú Proyectos temporalmente. Integración con código de Crystal Report. Validaciones con Try-Catch al generar los reportes, personalización de los formularios en estilos y botones y validación de selección de tipo de reporte. Creación de instalador con TODOS los cambios y la creación de las carpetas asociadas a los RPT.WatchersNET CKEditor™ Provider for DotNetNuke®: CKEditor Provider 1.14.01: Whats NewAdded New Plugin "Ventrian News Articles Link Selector" to select an Article Link from the News Article Module (This Plugin is not visible by default in your Toolbar, you need to manually add the 'newsarticleslinks' to your toolbarset) http://www.watchersnet.de/Portals/0/screenshots/dnn/CKEditorNewsArticlesLinks.png File-Browser: Added Paging to the Files List. You can define the Page Size in the Options (Default Value: 20) http://www.watchersnet.de/Portals/0/screenshots/dnn/CKEdito...MyRouter (Virtual WiFi Router): MyRouter 1.0 (Beta): A friendlier User Interface. A logger file to catch exceptions so you may send it to use to improve and fix any bugs that may occur. A feedback form because we always love hearing what you guy's think of MyRouter. Check for update menu item for you to stay up to date will the latest changes. Facebook fan page so you may spread the word and share MyRouter with friends and family And Many other exciting features were sure your going to love!WPF Sound Visualization Library: WPF SVL 0.3 (Source, Binaries, Examples, Help): Version 0.3 of WPFSVL. This includes three new controls: an equalizer, a digital clock, and a time editor.Thai Flood Watch: Thai Flood Watch - Source: non commercial use only ** This project supported by Department of Computer Science KhonKaen University Thailand.ZXing.Net: ZXing.Net 0.4.0.0: sync with rev. 2196 of the java version important fix for RGBLuminanceSource generating barcode bitmaps Windows Phone demo client (only tested with emulator, because I don't have a Windows Phone) Barcode generation support for Windows Forms demo client Webcam support for Windows Forms demo clientOrchard Project: Orchard 1.4: Please read our release notes for Orchard 1.4: http://docs.orchardproject.net/Documentation/Orchard-1-4-Release-Notes.NET Assembly Information: Assembly Information 2.1.0.1: - Fixed the issue in which AnyCPU binaries were shown as 32bit - Added support to show the errors in-case if some dlls failed to load.FluentData -Micro ORM with a fluent API that makes it simple to query a database: FluentData version 1.2: New features: - QueryValues method - Added support for automapping to enumerations (both int and string are supported). Fixed 2 reported issues.NetSqlAzMan - .NET SQL Authorization Manager: 3.6.0.15: 3.6.0.15 28-Feb-2012 • Fix: The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state. Work Item 10435: http://netsqlazman.codeplex.com/workitem/10435 • Fix: Made StorageCache thread safe. Thanks to tangrl. • Fix: Members property of SqlAzManApplicationGroup is not functioning. Thanks to tangrl. Work Item 10267: http://netsqlazman.codeplex.com/workitem/10267 • Fix: Indexer are making database calls. Thanks to t...SCCM Client Actions Tool: Client Actions Tool v1.1: SCCM Client Actions Tool v1.1 is the latest version. It comes with following changes since last version: Added stop button to stop the ongoing process. Added action "Query update status". Added option "saveOnlineComputers" in config.ini to enable saving list of online computers from last session. Default value for "LatestClientVersion" set to SP2 R3 (4.00.6487.2157). Wuauserv service manual startup mode is considered healthy on Windows 7. Errors are now suppressed in checkReleases...Kinect PowerPoint Control: Kinect PowerPoint Control v1.1: Updated for Kinect SDK 1.0.SharpCompress - a fully native C# library for RAR, 7Zip, Zip, Tar, GZip, BZip2: SharpCompress 0.8: API Updates: SOLID Extract Method for Archives (7Zip and RAR). ExtractAllEntries method on Archive classes will extract archives as a streaming file. This can offer better 7Zip extraction performance if any of the entries are solid. The IsSolid method on 7Zip archives will return true if any are solid. Removed IExtractionListener was removed in favor of events. Unit tests show example. Bug fixes: PPMd passes tests plus other fixes (Thanks Pavel) Zip used to always write a Post Descri...Social Network Importer for NodeXL: SocialNetImporter(v.1.3): This new version includes: - Download new networks for Facebook fan pages. - New options for downloading more posts - Bug fixes To use the new graph data provider, do the following: Unzip the Zip file into the "PlugIns" folder that can be found in the NodeXL installation folder (i.e "C:\Program Files\Social Media Research Foundation\NodeXL Excel Template\PlugIns") Open NodeXL template and you can access the new importer from the "Import" menuASP.NET REST Services Framework: Release 1.1 - Standard version: Beginning from v1.1 the REST-services Framework is compatible with ASP.NET Routing model as well with CRUD (Create, Read, Update, and Delete) principle. These two are often important when building REST API functionality within your application. It also includes ability to apply Filters to a class to target all WebRest methods, as well as some performance enhancements. New version includes Metadata Explorer providing ability exploring the existing services that becomes essential as the number ...SQL Live Monitor: SQL Live Monitor 1.31: A quick fix to make it this version work with SQL 2012. Version 2 already has 2012 working, but am still developing the UI in version 2, so this is just an interim fix to allow user to monitor SQL 2012.Content Slider Module for DotNetNuke: 01.02.00: This release has the following updates and new features: Feature: One-Click Enabling of Pager Setting Feature: Cache Sliders for Performance Feature: Configurable Cache Setting Enhancement: Transitions can be Selected Bug: Secure Folder Images not Viewable Bug: Sliders Disappear on Postback Bug: Remote Images Cause Error Bug: Deleted Images Cause Error System Requirements DotNetNuke v06.00.00 or newer .Net Framework v3.5 SP1 or newer SQL Server 2005 or newerImage Resizer for Windows: Image Resizer 3 Preview 3: Here is yet another iteration toward what will eventually become Image Resizer 3. This release is stable. However, I'm calling it a preview since there are still many features I'd still like to add before calling it complete. Updated on February 28 to fix an issue with installing on multi-user machines. As usual, here is my progress report. Done Preview 3 Fix: 3206 3076 3077 5688 Fix: 7420 Fix: 7527 Fix: 7576 7612 Preview 2 6308 6309 Fix: 7339 Fix: 7357 Preview 1 UI...Finestra Virtual Desktops: 2.5.4500: This is a bug fix release for version 2.5. It fixes several things and adds a couple of minor features. See the 2.5 release notes for more information on the major new features in that version. Important - If Finestra crashes on startup for you, you must install the Visual C++ 2010 runtime from http://www.microsoft.com/download/en/details.aspx?id=5555. Fixes a bug with window animations not refreshing the screen on XP and with DWM off Fixes a bug with with crashing on XP due to a bug in t...Media Companion: MC 3.432b Release: General Now remembers window location. Catching a few more exceptions when an image is blank TV A couple of UI tweaks Movies Fixed the actor name displaying HTML Fixed crash when using Save files as "movie.nfo", "movie.tbn", & "fanart.jpg" New CSV template for HTML output function Added <createdate> tag for HTML output A couple of UI tweaks Known Issues Multiepisodes are not handled correctly in MC. The created nfo is valid, but they are not displayed in MC correctly & saving the...New Projectsabac: abac cn websiteAION Launcher: simple aion launcher...just edit the background image of your choosing inside the code and other things such as the links for the buttons and the ip adress and port of the serverAXTFSTool: Dynamics AX tool that connects to your project's TFS and lists the objects your colleagues have changed. Written in C#, still under development and improvements. Useful for team leaders, deployment managers, etc.cookieTopo: Topo map viewerCrmFetchKit.js: Simple Library at allows the execution of fetchxml queries via JavaScript for Dynamics CRM 2011 (using the new WCF endpoints). Like the CrmRestKit this framework uses the promise/A capacities of jQuery. The code and the idea for this framework bases on the CrmServiceToolkit (http://crmtoolkit.codeplex.com/) developed by Daniel Cai. cy univerX engine: ????????DNSAPI.NET: A common API for managing DNS servers on Windows. This project is based on the work I started back in 2002 when I needed to create a web front-end for Windows' DNS server using the .Net framework. The plan is to expand on the project and include support for the BIND server on Windows too. ego.net: ego.netfdTFS: Team Foundation Server Source Control Plugin for FlashDevelopGeoWPS: GeoWPS is an implementation of the OGC WPS. It will be developed in C#. IThink: A new project.King Garden: Boy King's .net practical projects.King Garret: Boy King's .net learning projects.LottoCheck: Follow LottoNot-Terraria: This is a like terraria game but NOT terrariaPassword Protector: Password Protector SharePoint 2010 BlobCache Manager: Manage your web application's blobcache settings directly in the central administration.SharePoint 2010 SilverLight Multiple File Uploader: SharePoint 2010 SilverLight Multiple File Uploader for Documents Libraries with MetaData.Sharepoint Tool Collection: I want to Integrate Various Utilities of Sharepoint at one place. It is for easy working of user or developer. Ex-1. A utility which takes some params & csv file and upload 100s of items on the sharepoint list easily. Ex-2 A utility to upload documents in a library. etc.SQLCLR Cmd Exec Framework Example: For users of MS SQL Server, xp_cmdshell is a utility that we usually want to have disabled. However there are still cases where calling a command line is needed. This project provides an framework/example to make command line calls. It is not meant as an xp_cmdshell replacement but as a workaround.Symmetric Designs Python 3.2: Symmetric Designs for Python 3.2 helps graphical artists to design and develop their own designs freestyle. It uses the pygame module for Python 3.2. It can also be analysed in order to get a grasp of graphics programming in Python.Terminsoft open CLR libraries: Terminsoft open CLR libraries. The first is Terminsoft.Intervals, intended for modeling the sets of intervals with elements, the comparison operation is defined for. The second is Terminsoft.Syntax, intended for text parsing and transformation and built upon regular expressions.Thai Flood Watch: Thai Flood Watch provides useful information, up-to-date and visual access to the major canal in Bangkok, Thailand using data from department of drainage and sewerage. Easily monitor river and canal flow information in Bangkok area, right from your hand.TheNerd: Sample video game source code. Using Sunburn.Unity.WebAPI: A library that allows simple Integration of Microsoft's Unity IoC container with ASP.NET's WebAPI. This project includes a bespoke DependencyResolver that creates a child container per HTTP request and disposes of all registered IDisposable instances at the end of the request.Wholemy.RemoteTouch: The project is a remote touch-sensitive keyboard with a customizable interface which allows to supplement control of another computer, regardless of the wires. For example, if you have not so fast Tablet PC - a client and a fast desktop computer - the server using the network.WindowPlace: WindowPlace makes it possible to save Window positions and sizes to a profile. Switching between profiles will effortlessly move and resize your windows. Help improve productivity - especially for multi-monitor systems. Developed in C# using WPF and a few Windows API calls in the background. WP Error Manager (Devv.Core.WPErrorManager): Library to log, handle and report errors on Windows Phone 7 apps. Fully customizable and extremely easy to implement. Works with any WP7 app. Tested with the emulator, Nokia Lumia 800 and Samsung Focus Flash.WPMatic: Windows Phone7 App to manage Homematic (eQ-3) Devices. The App is like the Homematic Central Configuration Unit (CCU) in German.www.Nabaza.com Freeware and Ebooks: www.Nabaza.com Freeware and Ebooks by William R. NabazaZap: Zap is a light weight .NET communication framework. It is designed for programs running in local area network. Zap provides code generation tool that enables user to call remote methods, add/remote event listener to remote objects, while hides the lower details.

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• Using an alternate search platform in Commerce Server 2009

  - by Lewis Benge

  Although Microsoft Commerce Server 2009's architecture is built upon Microsoft SQL Server, and has the full power of the SQL Full Text Indexing Search Platform, there are time however when you may require a richer or alternate search platform. One of these scenarios if when you want to implement a faceted (refinement) search into your site, which provides dynamic refinements based on the search results dataset. Faceted search is becoming popular in most online retail environments as a way of providing an enhanced user experience when browsing a larger catalogue. This is powerful for two reasons, firstly with a traditional search it is down to a user to think of a search term suitable for the product they are trying to find. This typically will not return similar products or help in any way to refine a larger dataset. Faceted searches on the other hand provide a comprehensive list of product properties, grouped together by similarity to help the user narrow down the results returned, as the user progressively restricts the search criteria by selecting additional criteria to search again, these facets needs to continually refresh. The whole experience allows users to explore alternate brands, price-ranges, or find products they hadn't initially thought of or where looking for in a bid to enhance cross sell in the retail environment. The second advantage of this type of search from a business perspective is also to harvest the search result to start to profile your user. Even though anonymous users may routinely visit your site, and will not necessarily register or complete a transaction to build up marketing data- profiling, you can still achieve the same result by recording search facets used within the search sequence. Below is a faceted search scenario generated from eBay using the search term "server". By creating a search profile of clicking through Computer & Networking -> Servers -> Dell - > New and recording this information against my user profile you can start to predict with a lot more certainty what types of products I am interested in. This will allow you to apply shopping-cart analysis against your search data and provide great cross-sale or advertising opportunity, or personalise the user experience based on your prediction of what the user may be interested in. This type of search is extremely beneficial in e-Commerce environments but achieving it out of the box with Commerce Server and SQL Full Text indexing can be challenging. In many deployments it is often easier to use an alternate search platform such as Microsoft's FAST, Apache SOLR, or Endecca, however you still want these products to integrate natively into Commerce Server to ensure that up-to-date inventory information is presented, profile information is generated, and you provide a consistant API. To do so we make the most of the Commerce Server extensibilty points called operation sequence components. In this example I will be talking about Apache Solr hosted on Apache Tomcat, in this specific example I have used the SolrNet C# library to interface to the Java platform. Also I am not going to talk about Solr configuration of indexing – but in a production envionrment this would typically happen by using Powershell to call the Commerce Server management webservice to export your catalog as XML, apply an XSLT transform to the file to make it conform to SOLR and use a simple HTTP Post to send it to the search enginge for indexing. Essentially a sequance component is a step in a serial workflow used to call a data repository (which in most cases is usually the Commerce Server pipelines or databases) and map to and from a Commerce Entity object whilst enforcing any business rules. So the first step in the process is to add a new class library to your existing Commerce Server site. You will need to use a new library as Sequence Components will need to be strongly named to be deployed. Once you are inside of your new project, add a new class file and add a reference to the Microsoft.Commerce.Providers, Microsoft.Commerce.Contracts and the Microsoft.Commerce.Broker assemblies. Now make your new class derive from the base object Microsoft.Commerce.Providers.Components.OperationSequanceComponent and overide the ExecuteQueryMethod. Your screen will then look something similar ot this: As all we are doing on this component is conducting a search we are only interested in the ExecuteQuery method. This method accepts three arguments, queryOperation, operationCache, and response. The queryOperation will be the object in which we receive our search parameters, the cache allows access to the Commerce Server cache allowing us to store regulary accessed information, and the response object is the object which we will return the result of our search upon. Inside this method is simply where we are going to inject our logic for our third party search platform. As I am not going to explain the inner-workings of actually making a SOLR call, I'll simply provide the sample code here. I would highly recommend however looking at the SolrNet wiki as they have some great explinations of how the API works. What you will find however is that there are some further extensions required when attempting to integrate a custom search provider. Firstly you out of the box the CommerceQueryOperation you will receive into the method when conducting a search against a catalog is specifically geared towards a SQL Full Text Search with properties such as a Where clause. To make the operation you receive more relevant you will need to create another class, this time derived from Microsoft.Commerce.Contract.Messages.CommerceSearchCriteria and within this you need to detail the properties you will require to allow you to submit as parameters to the SOLR search API. My exmaple looks like this: [DataContract(Namespace = "http://schemas.microsoft.com/microsoft-multi-channel-commerce-foundation/types/2008/03")] public class CommerceCatalogSolrSearch : CommerceSearchCriteria { private Dictionary<string, string> _facetQueries;   public CommerceCatalogSolrSearch() { _facetQueries = new Dictionary<String, String>();   }     public Dictionary<String, String> FacetQueries { get { return _facetQueries; } set { _facetQueries = value; } }   public String SearchPhrase{ get; set; } public int PageIndex { get; set; } public int PageSize { get; set; } public IEnumerable<String> Facets { get; set; }   public string Sort { get; set; }   public new int FirstItemIndex { get { return (PageIndex-1)*PageSize; } }   public int LastItemIndex { get { return FirstItemIndex + PageSize; } } }  To allow you to construct a CommerceQueryOperation call within the API you will also need to construct another class to derived from Microsoft.Commerce.Common.MessageBuilders.CommerceSearchCriteriaBuilder and is simply used to construct an instance of the CommerceQueryOperation you have just created and expose the properties you want set. My Message builder looks like this: public class CommerceCatalogSolrSearchBuilder : CommerceSearchCriteriaBuilder { private CommerceCatalogSolrSearch _solrSearch;   public CommerceCatalogSolrSearchBuilder() { _solrSearch = new CommerceCatalogSolrSearch(); }   public String SearchPhrase { get { return _solrSearch.SearchPhrase; } set { _solrSearch.SearchPhrase = value; } }   public int PageIndex { get { return _solrSearch.PageIndex; } set { _solrSearch.PageIndex = value; } }   public int PageSize { get { return _solrSearch.PageSize; } set { _solrSearch.PageSize = value; } }   public Dictionary<String,String> FacetQueries { get { return _solrSearch.FacetQueries; } set { _solrSearch.FacetQueries = value; } }   public String[] Facets { get { return _solrSearch.Facets.ToArray(); } set { _solrSearch.Facets = value; } } public override CommerceSearchCriteria ToSearchCriteria() { return _solrSearch; } }  Once you have these two classes in place you can now safely cast the CommerceOperation you receive as an argument of the overidden ExecuteQuery method in the SequenceComponent to the CommerceCatalogSolrSearch operation you have just created, e.g. public CommerceCatalogSolrSearch TryGetSearchCriteria(CommerceOperation operation) { var searchCriteria = operation as CommerceQueryOperation; if (searchCriteria == null) throw new Exception("No search criteria present");   var local = (CommerceCatalogSolrSearch) searchCriteria.SearchCriteria; if (local == null) throw new Exception("Unexpected Search Criteria in Operation");   return local; }  Now you have all of your search parameters present, you can go off an call the external search platform API. You will of-course get proprietry objects returned, so the next step in the process is to convert the results being returned back into CommerceEntities. You do this via another extensibility point within the Commerce Server API called translatators. Translators are another separate class, this time derived inheriting the interface Microsoft.Commerce.Providers.Translators.IToCommerceEntityTranslator . As you can imaginge this interface is specific for the conversion of the object TO a CommerceEntity, you will need to implement a separate interface if you also need to go in the opposite direction. If you implement the required method for the interace you will get a single translate method which has a source onkect, destination CommerceEntity, and a collection of properties as arguments. For simplicity sake in this example I have hard-coded the mappings, however best practice would dictate you map the objects using your metadatadefintions.xml file . Once complete your translator would look something like the following: public class SolrEntityTranslator : IToCommerceEntityTranslator { #region IToCommerceEntityTranslator Members   public void Translate(object source, CommerceEntity destinationCommerceEntity, CommercePropertyCollection propertiesToReturn) { if (source.GetType().Equals(typeof (SearchProduct))) { var searchResult = (SearchProduct) source;   destinationCommerceEntity.Id = searchResult.ProductId; destinationCommerceEntity.SetPropertyValue("DisplayName", searchResult.Title); destinationCommerceEntity.ModelName = "Product";   } }  Once you have a translator in place you can then safely map the results of your search platform into Commerce Entities and attach them on to the CommerceResponse object in a fashion similar to this: foreach (SearchProduct result in matchingProducts) { var destinationEntity = new CommerceEntity(_returnModelName);   Translator.ToCommerceEntity(result, destinationEntity, _queryOperation.Model.Properties); response.CommerceEntities.Add(destinationEntity); }  In SOLR I actually have two objects being returned – a product, and a collection of facets so I have an additional translator for facet (which maps to a custom facet CommerceEntity) and my facet response from SOLR is passed into the Translator helper class seperatley. When all of this is pieced together you have sucessfully completed the extensiblity point coding. You would have created a new OperationSequanceComponent, a custom SearchCritiera object and message builder class, and translators to convert the objects into Commerce Entities. Now you simply need to configure them, and can start calling them in your code. Make sure you sign you assembly, compile it and identiy its signature. Next you need to put this a reference of your new assembly into the Channel.Config configuration file replacing that of the existing SQL Full Text component: You will also need to add your translators to the Translators node of your Channel.Config too: Lastly add any custom CommerceEntities you have developed to your MetaDataDefintions.xml file. Your configuration is now complete, and you should now be able to happily make a call to the Commerce Foundation API, which will act as a proxy to your third party search platform and return back CommerceEntities of your search results. If you require data to be enriched, or logged, or any other logic applied then simply add further sequence components into the OperationSequence (obviously keeping the search response first) to the node of your Channel.Config file. Now to call your code you simply request it as per any other CommerceQuery operation, but taking into account you may be receiving multiple types of CommerceEntity returned: public KeyValuePair<FacetCollection ,List<Product>> DoFacetedProductQuerySearch(string searchPhrase, string orderKey, string sortOrder, int recordIndex, int recordsPerPage, Dictionary<string, string> facetQueries, out int totalItemCount) { var products = new List<Product>(); var query = new CommerceQuery<CatalogEntity, CommerceCatalogSolrSearchBuilder>();   query.SearchCriteria.PageIndex = recordIndex; query.SearchCriteria.PageSize = recordsPerPage; query.SearchCriteria.SearchPhrase = searchPhrase; query.SearchCriteria.FacetQueries = facetQueries;     totalItemCount = 0; CommerceResponse response = SiteContext.ProcessRequest(query.ToRequest()); var queryResponse = response.OperationResponses[0] as CommerceQueryOperationResponse;   // No results. Return the empty list if (queryResponse != null && queryResponse.CommerceEntities.Count == 0) return new KeyValuePair<FacetCollection, List<Product>>();   totalItemCount = (int)queryResponse.TotalItemCount;   // Prepare a multi-operation to retrieve the product variants var multiOperation = new CommerceMultiOperation();     //Add products to results foreach (Product product in queryResponse.CommerceEntities.Where(x => x.ModelName == "Product")) { var productQuery = new CommerceQuery<Product>(Product.ModelNameDefinition); productQuery.SearchCriteria.Model.Id = product.Id; productQuery.SearchCriteria.Model.CatalogId = product.CatalogId;   var variantQuery = new CommerceQueryRelatedItem<Variant>(Product.RelationshipName.Variants);   productQuery.RelatedOperations.Add(variantQuery);   multiOperation.Add(productQuery); }   CommerceResponse variantsResponse = SiteContext.ProcessRequest(multiOperation.ToRequest()); foreach (CommerceQueryOperationResponse queryOpResponse in variantsResponse.OperationResponses) { if (queryOpResponse.CommerceEntities.Count() > 0) products.Add(queryOpResponse.CommerceEntities[0]); }   //Get facet collection FacetCollection facetCollection = queryResponse.CommerceEntities.Where(x => x.ModelName == "FacetCollection").FirstOrDefault();     return new KeyValuePair<FacetCollection, List<Product>>(facetCollection, products); }    ..And that is it – simply a few classes and some configuration will allow you to extend the Commerce Server query operations to call a third party search platform, whilst still maintaing a unifed API in the remainder of your code. This logic stands for any extensibility within CommerceServer, which requires excution in a serial fashioon such as call to LOB systems or web service to validate or enrich data. Feel free to use this example on other applications, and if you have any questions please feel free to e-mail and I'll help out where I can!

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