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• Cucumber testing with rails on mongoid-gridfs

  - by Deepak Lamichhane

  I am getting this weird error while running cucumber test: ERROR Mongo::OperationFailure: Database command 'filemd5' failed: {"errmsg"="exception: best guess plan requested, but scan and order required: query: { files_id: ObjectId('4d1abab3a15c84139c00006e') } order: { files_id: 1, n: 1 } choices: { $natural: 1 } ", "code"=13284, "ok"=0.0} I have a list of similar scenarios, where first scenario passes but all the other following scenario fails. I searched for it and I found that there is problem with indexing. But, I am not sure about what query to write. Furthermore, I can add the query on the mongo of the development. I want to make sure that the indexing is done in test too. If anyone has any idea on this, feel free.

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• What do you do when you feel you need a variatic list comprehension?

  - by cspyr0

  I would like to make a method where I could give it a list of lengths and it would return all combinations of cartesian coordinates up to those lengths. Easier to explain with an example: cart [2,5] Prelude> [ [0,0],[0,1],[0,2],[0,3],[0,4],[1,0],[1,1],[1,2],[1,3],[1,4] ] cart [2,2,2] Prelude> [ [0,0,0],[0,0,1],[0,1,0],[0,1,1],[1,0,0],[1,0,1],[1,1,0],[1,1,1] ] A simple list comprehension won't work because I don't know how long the lists are going to be. While I love Haskell's simplicity for many problems, this is one that I could write procedurally (in C or something) in 5 minutes whereas Haskell gives me an aneurysm! A solution to this specific problem would help me out a lot; I'd also love to hear about your thought processes when tackling stuff like this.

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• Avoiding Nested Queries

  - by Midhat

  How Important is it to avoid nested queries. I have always learnt to avoid them like a plague. But they are the most natural thing to me. When I am designing a query, the first thing I write is a nested query. Then I convert it to joins, which sometimes takes a lot of time to get right. And rarely gives a big performance improvement (sometimes it does) So are they really so bad. Is there a way to use nested queries without temp tables and filesort

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• Better performance to Query the DB or Cache small result sets?

  - by user169867

  Say I need to populate 4 or 5 dropdowns w/ items from a database. Each drop down will have < 15 items in it. These items almost never change. Now I could query the DB each time the page is accessed or I could grab the values from a custom class that would check to see if they already exist in ASP.Net's cache and only if they don't query the DB to update the cache. It's trivial for me to write but I'm unsure if the performace would be better or not. I think it would be (although not likely anything huge). What do you think?

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• Display array values from web service method

  - by chupinette

  Hello all! I'm new to web services and im actually trying to learn how to develop one in C#. I have the following method in my web service which actually displays an array of int when i test it. [WebMethod] public int[] FindID(string str1,string str2) { Customer obj = new Customer(); obj.FindMatch(str1,str2); return obj.customer_id; } Now in my web application in which i have a button, the code is as below: Dim obj As localhost.Service = New localhost.Service Dim str1 As String = Session("str1") Dim str2 As String = Session("str2") Response.Write(obj.FindID(str1, str2)) The problem is that only the first value from the array is being displayed. Can anyone please help me to solve this problem?

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• Get pointer to member function from within member function in C++

  - by Eli

  Currently in the program I am attempting to write I need to be able to get a pointer to a member function within a member function of the same class. The pointer needs to be passed to a function as a void (*)(). Example: //CallFunc takes a void (*)() argument class testClass { public: void aFunc2; void aFunc1; } void testClass:aFunc2(){ callFunc(this.*aFunc1); // How should this be done? } void testClass:aFunc1(){ int someVariable = 1; } I'm trying to do this in GCC 4.0.1. Also, the member function being called can't be static because it references non-static variables in the class that it is part of.

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• Writing datatable to database file, one record at a time in C#

  - by Kevin

  Hi! I want to write a C# program that will read a row from a datatable (named loadDT) and update a database file (named Forecasts.mdb). My datatable looks like this (each day's value is a number representing kilowatts usage forecast): Hour Day1 Day2 Day3 Day4 Day5 Day6 Day7 1 519 520 524 498 501 476 451 My database file looks like this: Day Hour KWForecast 1 1 519 2 1 520 3 1 524 ... and so on. Basically, I want to be able to read one row from the datatable, and then extrapolate that out to my database file, one record at a time. Each row from the datatable will result in seven records written to the database file. Any ideas on how to go about this? I can connect to my database, the connection string works, and I can update and delete from the database. I just can't wrap my head around how to do this one record at a time. Thanks in advance for any help and advice.

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• Godaddy's Code sign certificate and MIDlet

  - by abc

  i have developed an application in java (J2ME), and i want trusted domain for that application using goDaddy's certificate. can i obtain it ? let me re describe the full scenario. i have developed an application.in which i want FILE IO operations to be done without the permission of user (for every read write, it means user will be asked only once.) so to obtain that i want trusted domain for my application. for that i need to sign my application using code sign certificate. now go Daddy's certificate is not listed under Nokia 3110Classic, so i have externally added it in CA list. but still its showing app signing option disabled. so my question is can i obtain trusted domain using the goDaddy's code sign certificate ?

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• Reading Images only from Camera

  - by Ankit

  I wanted to read images only from the Camera folder of the device. Since the folder might be different for different devices, how can I write a simple application for it). So far I have written the following code, which does read from Camera folder, but it also reads from other places on sdcard as well. Cursor childCursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, MediaStore.Images.ImageColumns._ID, null); do { ImageView image = new ImageView(); image.setImageURI(Uri.withAppendedPath(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, ""+ childCursor.getString( childCursor.getColumnIndex( MediaStore.Images.ImageColumns._ID ))); <some other code> } while (childCursor.moveToNext()); How can I create a generic app and filter on Camera Images before displaying. Any help is appreciated.

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• How to collect user opinions about software

  - by alga

  I have written a small .net Windows Forms application. And now I decided to get opinions or comments from users. User will just write something in a input form and click a send button. I want to use the most easiest way. I don't want to host any webservices or another applications for gathering the information. Also I don't have a database. Nothing. I just want to know what people think about the application. How would you do it?

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• Socket programming and telnet with VB.net

  - by Mike

  I'm writing a GUI-based app in VB.net that talks to a LambdaMOO server via telnet, sends commands to display the object hierarchy, then parses the output and creates a visual representation of the object hierarchy. So my question is: is there some kind of "telnet client" class for .NET to simplify the sending and receiving of data, or do I have to write my own using the socket API? Does Mono have something like this? Barring an easy solution, does anyone have a good tutorial they can point to for telnet client programming in VB.net?

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• Parsing log files in a folder in ColdFusion

  - by Simon Guo

  The problem is there is a folder ./log/ containing the files like: jan2010.xml, feb2010.xml, mar2010.xml, jan2009.xml, feb2009.xml, mar2009.xml ... each xml file would like: <root><record name="bob" spend="20"></record>...(more records)</root> I want to write a piece of ColdFusion code (log.cfm) that simply parsing those xml files. For the front end I would let user to choose a year, then the click submit button. All the content in that year will be show up in separate table by month. Each table shows the total money spent for each person. like: person cost bob 200 mike 300 Total 500 Thanks.

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• SOCKET chat C# with private messaging

  - by Sergei

  I want to create SOCKET chat(server + clients) with private messaging. When client write smth to stream, he should notify server that it is private message for user X, how can i do this? Actually i can do smth like this: string command = "PRIV|" + txtMessage.Text; swSender.WriteLine(command); but i think it isn't good, for example if user wants send message like our "PRIV|" flag it will be errors public class TestChat { private StreamWriter swSender; private IPAddress ipAddr; private void InitializeandSend() { //ip from text box ipAddr = IPAddress.Parse(txtIp.Text); // Start a new TCP connections to the chat server tcpServer = new TcpClient(); tcpServer.Connect(ipAddr, 1986); //... //sending message from text box swSender.WriteLine(txtMessage.Text); swSender.Flush(); } }

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• image with json and iphone

  - by alecnash

  Hi, I've got some images saved inside a db in a server and want to use them for my iphone. I created a php file so I can access them with json, got some questions though. I save all the text data from the db to a nsdictonary and it works fine. For the images should I use nsdata? Should I write a new php file for getting the image or is one enough because I am using an array to store my objects and then I use json_encode($arr) for json. Is it ok to store data to an array or is everything gonna crash?

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• jquery get the index of a row?

  - by KnockKnockWhosThere

  I'm trying to write a function that will do something if the the row index is 0, and then something else if the row index is greater than 0. The zero part is working, but I can't figure out the syntax for rows that have an index greater than 0. For the tr[0] row, I'm doing this: if($("#mytable > tbody > tr ").index(0)) { ... I tried: if($("#mytable > tbody > tr ").index() > 0 ) { But, that didn't work?

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• calling a function without knowing the number of parameters in advance

  - by Sourabh Bose

  suppose i have a dll with 2 functions.name of dll="dll1" f1(int a, int b, int c); f2(int a); my program would take the funtion name ,the dll name and a "list" of parameters as input. how would i call the appropriate function with its appropriate parameters. i.e, if input is dll1 f1 list(5,8,9) this would require me to call f1 with 3 parameters if input was dll1 f2 list(8) it would require me to call f2 with one parameter how would i call the function without knowing the number of parameters in advance. further clarification: how do I write code that will call any function with all its arguments by building the argument list dynamically using some other source of information

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• How to access USB ports in java

  - by Petezah

  Hi I'm trying to write a java application that accesses the usb ports to some read and writes to a device connected through usb. The problem I face is that I don't know what exactly to use in java to do such a thing. I searched online a found something called jusb but all the post seem fairly old. Currently I'm using the RXTX libraries but I sometimes run into some sync error. When I use C# to do the equivalent it requires far less code and I don't face any of the same sync error. My question is there anything built into the latest version of the JRE I can use to access the usb ports that is just as easy as the equivalent C# code? Sorry if the question isn't too clear, I'm fairly noob with coding usb IO.

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• For Loop help In a Hash Cracker Homework.

  - by aaron burns

  On the homework I am working on we are making a hash cracker. I am implementing it so as to have my cracker. java call worker.java. Worker.java implements Runnable. Worker is to take the start and end of a list of char, the hash it is to crack, and the max length of the password that made the hash. I know I want to do a loop in run() BUT I cannot think of how I would do it so it would go to the given max pasword length. I have posted the code I have so far. Any directions or areas I should look into.... I thought there was a way to do this with a certain way to write the loop but I don't know or can't find the correct syntax. Oh.. also. In main I divide up so x amount of threads can be chosen and I know that as of write now it only works for an even number of the 40 possible char given. package HashCracker; import java.util.*; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class Cracker { // Array of chars used to produce strings public static final char[] CHARS = "abcdefghijklmnopqrstuvwxyz0123456789.,-!".toCharArray(); public static final int numOfChar=40; /* Given a byte[] array, produces a hex String, such as "234a6f". with 2 chars for each byte in the array. (provided code) */ public static String hexToString(byte[] bytes) { StringBuffer buff = new StringBuffer(); for (int i=0; i<bytes.length; i++) { int val = bytes[i]; val = val & 0xff; // remove higher bits, sign if (val<16) buff.append('0'); // leading 0 buff.append(Integer.toString(val, 16)); } return buff.toString(); } /* Given a string of hex byte values such as "24a26f", creates a byte[] array of those values, one byte value -128..127 for each 2 chars. (provided code) */ public static byte[] hexToArray(String hex) { byte[] result = new byte[hex.length()/2]; for (int i=0; i<hex.length(); i+=2) { result[i/2] = (byte) Integer.parseInt(hex.substring(i, i+2), 16); } return result; } public static void main(String args[]) throws NoSuchAlgorithmException { if(args.length==1)//Hash Maker { //create a byte array , meassage digestand put password into it //and get out a hash value printed to the screen using provided methods. byte[] myByteArray=args[0].getBytes(); MessageDigest hasher=MessageDigest.getInstance("SHA-1"); hasher.update(myByteArray); byte[] digestedByte=hasher.digest(); String hashValue=Cracker.hexToString(digestedByte); System.out.println(hashValue); } else//Hash Cracker { ArrayList<Thread> myRunnables=new ArrayList<Thread>(); int numOfThreads = Integer.parseInt(args[2]); int charPerThread=Cracker.numOfChar/numOfThreads; int start=0; int end=charPerThread-1; for(int i=0; i<numOfThreads; i++) { //creates, stores and starts threads. Runnable tempWorker=new Worker(start, end, args[1], Integer.parseInt(args[1])); Thread temp=new Thread(tempWorker); myRunnables.add(temp); temp.start(); start=end+1; end=end+charPerThread; } } } import java.util.*; public class Worker implements Runnable{ private int charStart; private int charEnd; private String Hash2Crack; private int maxLength; public Worker(int start, int end, String hashValue, int maxPWlength) { charStart=start; charEnd=end; Hash2Crack=hashValue; maxLength=maxPWlength; } public void run() { byte[] myHash2Crack_=Cracker.hexToArray(Hash2Crack); for(int i=charStart; i<charEnd+1; i++) { Cracker.numOfChar[i]////// this is where I am stuck. } } }

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• Prevent Casual Piracy for Simple Utility

  - by Chad

  I've written a small utility that I wish to sell for less than $10. My primary concern is "casual piracy". The scenario that plays out in my mind is this: User buys the program, enjoys using it and tells their friends. The friends copy the application to their USB drives and take it home - using the application for free (maybe never realizing they should have purchased it. Since I've got absolutely no protection built in, it would just be a simple copy'n paste to pirate the app. The users who would be using the app are in close proximity to each other (work in the same environment), so casual piracy would likely occur frequently. Any ideas? Keeping in mind the app is cheap (partly to reduce casual piracy), and the level of effort to write the app hasn't been very demanding. Update: the app will run on any system that supports .NET 3.5.

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• I have many processes in my usecase , is this normal ?

  - by BugKiller

  Hi, I'm working now on a big system that consists of many subsystems , each subsystem depends on the other. I wrote a usecase for this system , but I note that I have many processes in my usecase ( more than 40 processes ! ) . it looks like this : Group subsystem: add Group. remove Group. join to Group. upload file. create poll. remove file. remove poll. write post/topic close post. edit post. .... Messages Centers send message view inbox read message. and so on .. each user interacts with these processes . How can I reduce the number of these processes? Is it possible to divide the usecase processes into many pages?

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• php preg_match pattern to extract a specific information, regex

  - by Michael

  I need to extract a specific Id from a html document but the problem is that the id must not "be used". Here is the html content http://pastebin.com/wF2dx8JZ As you may see there are different html blocks . Some of them contain the "Used" word so I need to extract only the first id which is not used. Basically I can write a simple pattern like : $pattern = "/javascript:tw(.*))/"; preg_match_all($pattern, $content, $matches); $id = $matches[1][0]; However in this case I'm also getting the "ids" which are used so I don't know how to exclude them from the equation . Any idea would be highly appreciated.

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• Jquery and Ajax to Dynamically load IFrame

  - by JCHASE11

  I have a script that dynamically loads iframes inside a webpage. You can see the demo here: DEMO I want to use jquery to achieve the same rseult, but with a nice sliding effect. Basically, I have 10 links on a page. When the link is clicked, I want the iframe window to load in the new content and apply an effect to the transition. Does anyone know of any plugins that exist for this. I am not experienced enough to write a script from scratch, so any help would be much appreciated!

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• Silverlight data-driven application with NHibernate

  - by Tigraine

  Hi Guys, this is more of a subjective Question, but I'll ask it anyway. I'm about to develop a very data-centric application that has to run inside the browser. The frontend will be Silverlight, backed by a Fluent NHibernate service that runs server side. The problem here is: Wherever I look for data-driven silverlight app I wind up finding Silverlight RIA services examples, but nothing on how to build this without some ADO.NET stuff involved. I have little to no knowledge in WCF so far, but from the limited research I did it seems like WCF is pretty much the only way to let the client talk to the server. Are there any tutorials/best practices on how to write a Silverlight MVVM app that provides CRUD for a non-EF database? Suggestions would be very much appreciated. Thanks PS: I can't use .NET remoting. The backend has to run on IIS6 :(

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• Pattern Matching in Columns

  - by Chronicles

  File 1 A11;F1;BMW A23;F2;BMW B12;F3;BMW H11;F4;JBW File 2 P01;A1;0;0--00 ;123;456;150 P01;A11;0;0--00 ;123;444;208 P01;B12;0;0--00 ;123;111;36 P01;V11;0;0--00 ;123;787;33.9 Output -;-;-;P01;A1;0;0--00 ;123;456;150 A11;F1;BMW;P01;A11;0;0--00 ;123;444;208 B12;F3;BMW;P01;B12;0;0--00 ;123;111;36 -;-;-;P01;V11;0;0--00 ;123;787;33.9 I TRIED awk 'FNR==NR {a[$2] = $0; next }{ if($1 in a) {p=$1;$1="";print a[p],$0}}' File1 File2 But didnt work. Basically I want to get the details from FILE 1 and compare with FILE2 (master list) . Example : A1 in FILE2 was not available in FILE1 , so in output file we have “-“ for 1st three fields and rest from FILE2 . Now, we have A11 and we got the detail in FILE1. So we write details of A11 from both File 1 & 2

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• Set date format in ruby model (sinatra/datamapper)

  - by Gearóid

  Hi, I have a ruby model that contains a date attribue which I'd like to be able to pass in as a parameter in the format dd/MM/yyyy. However, my sqlite3 db stores the data in yyyy-MM-dd format so when a date like 20/10/2010 gets passed in, it will not be read to the database. I am using the Sinatra framework and using haml for the markup creation. Do I need to write a helper that takes the date string and converts it to the correct format for the db? Or can I set a format type on the models attribute? Thanks.

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