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• Active Directory: trouble adding new DC

  - by ethrbunny

  I have a domain with 3 DCs. One is starting to fail so I brought up a new one. All are running Win 2003. Problem: there appear to be replication issues between the 4 machines but I can't figure out what's causing this. All are registered with the DNS as identically as I can make them. How do I know there is a problem? Nagios is telling me that the other 3 DCs are having KCCEvent errors and the new machine is reporting "failed connectivity" errors. Doing dcdiag on the new machine reports: the host could not be resolved to an IP address. This seems crazy as I log into it using the DNS name. I can ping it from the other three machines using this DNS name as well. repadmin /showreps from the new machine says its seeing the other 3 machines. Doing the same from one of the older machines doesn't show the new machine. I've tried netdiag /repair numerous times. No luck. There are no firewalls running on any of the machines. If I look at Domain info via MMC (on the new machine) it appears that all the information is current. Users, computers, DCs.. its all there. Im puzzled as to what step(s) I've missed in adding this new machine. Suggestions? EDIT: dcdiag from non-working: C:\Documents and Settings\Administrator.BME>dcdiag Domain Controller Diagnosis Performing initial setup: Done gathering initial info. Doing initial required tests Testing server: Default-First-Site-Name\YELLOW Starting test: Connectivity The host 312ce6ea-7909-4e15-aff6-45c3d1d9a0d9._msdcs.server.edu could not be resolved to an IP address. Check the DNS server, DHCP, server name, etc Although the Guid DNS name (312ce6ea-7909-4e15-aff6-45c3d1d9a0d9._msdcs.server.edu) couldn't be resolved, the server name (yellow.server.edu) resolved to the IP address (10.127.24.79) and was pingable. Check that the IP address is registered correctly with the DNS server. ......................... YELLOW failed test Connectivity Doing primary tests Testing server: Default-First-Site-Name\YELLOW Skipping all tests, because server YELLOW is not responding to directory service requests Running partition tests on : Schema Starting test: CrossRefValidation ......................... Schema passed test CrossRefValidation Starting test: CheckSDRefDom ......................... Schema passed test CheckSDRefDom Running partition tests on : Configuration Starting test: CrossRefValidation ......................... Configuration passed test CrossRefValidation Starting test: CheckSDRefDom ......................... Configuration passed test CheckSDRefDom Running partition tests on : bme Starting test: CrossRefValidation ......................... bme passed test CrossRefValidation Starting test: CheckSDRefDom ......................... bme passed test CheckSDRefDom Running enterprise tests on : server.edu Starting test: Intersite ......................... server.edu passed test Intersite Starting test: FsmoCheck ......................... server.edu passed test FsmoCheck dcdiag from working: P:\>dcdiag Domain Controller Diagnosis Performing initial setup: Done gathering initial info. Doing initial required tests Testing server: Default-First-Site-Name\AD1 Starting test: Connectivity ......................... AD1 passed test Connectivity Doing primary tests Testing server: Default-First-Site-Name\AD1 Starting test: Replications ......................... AD1 passed test Replications Starting test: NCSecDesc ......................... AD1 passed test NCSecDesc Starting test: NetLogons ......................... AD1 passed test NetLogons Starting test: Advertising ......................... AD1 passed test Advertising Starting test: KnowsOfRoleHolders ......................... AD1 passed test KnowsOfRoleHolders Starting test: RidManager ......................... AD1 passed test RidManager Starting test: MachineAccount ......................... AD1 passed test MachineAccount Starting test: Services ......................... AD1 passed test Services Starting test: ObjectsReplicated ......................... AD1 passed test ObjectsReplicated Starting test: frssysvol ......................... AD1 passed test frssysvol Starting test: frsevent ......................... AD1 passed test frsevent Starting test: kccevent ......................... AD1 passed test kccevent Starting test: systemlog ......................... AD1 passed test systemlog Starting test: VerifyReferences ......................... AD1 passed test VerifyReferences Running partition tests on : Schema Starting test: CrossRefValidation ......................... Schema passed test CrossRefValidation Starting test: CheckSDRefDom ......................... Schema passed test CheckSDRefDom Running partition tests on : Configuration Starting test: CrossRefValidation ......................... Configuration passed test CrossRefValidation Starting test: CheckSDRefDom ......................... Configuration passed test CheckSDRefDom Running partition tests on : bme Starting test: CrossRefValidation ......................... bme passed test CrossRefValidation Starting test: CheckSDRefDom ......................... bme passed test CheckSDRefDom Running enterprise tests on : server.edu Starting test: Intersite ......................... server.edu passed test Intersite Starting test: FsmoCheck ......................... server.edu passed test FsmoCheck P:\>

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• Creating a multi-tenant application using PostgreSQL's schemas and Rails

  - by ramon.tayag

  Stuff I've already figured out I'm learning how to create a multi-tenant application in Rails that serves data from different schemas based on what domain or subdomain is used to view the application. I already have a few concerns answered: How can you get subdomain-fu to work with domains as well? Here's someone that asked the same question which leads you to this blog. What database, and how will it be structured? Here's an excellent talk by Guy Naor, and good question about PostgreSQL and schemas. I already know my schemas will all have the same structure. They will differ in the data they hold. So, how can you run migrations for all schemas? Here's an answer. Those three points cover a lot of the general stuff I need to know. However, in the next steps I seem to have many ways of implementing things. I'm hoping that there's a better, easier way. Finally, to my question When a new user signs up, I can easily create the schema. However, what would be the best and easiest way to load the structure that the rest of the schemas already have? Here are some questions/scenarios that might give you a better idea. Should I pass it on to a shell script that dumps the public schema into a temporary one, and imports it back to my main database (pretty much like what Guy Naor says in his video)? Here's a quick summary/script I got from the helpful #postgres on freenode. While this will probably work, I'm gonna have to do a lot of stuff outside of Rails, which makes me a bit uncomfortable.. which also brings me to the next question. Is there a way to do this straight from Ruby on Rails? Like create a PostgreSQL schema, then just load the Rails database schema (schema.rb - I know, it's confusing) into that PostgreSQL schema. Is there a gem/plugin that has these things already? Methods like "create_pg_schema_and_load_rails_schema(the_new_schema_name)". If there's none, I'll probably work at making one, but I'm doubtful about how well tested it'll be with all the moving parts (especially if I end up using a shell script to create and manage new PostgreSQL schemas). Thanks, and I hope that wasn't too long! UPDATE May 11, 2010 11:26 GMT+8 Since last night I've been able to get a method to work that creates a new schema and loads schema.rb into it. Not sure if what I'm doing is correct (seems to work fine, so far) but it's a step closer at least. If there's a better way please let me know. module SchemaUtils def self.add_schema_to_path(schema) conn = ActiveRecord::Base.connection conn.execute "SET search_path TO #{schema}, #{conn.schema_search_path}" end def self.reset_search_path conn = ActiveRecord::Base.connection conn.execute "SET search_path TO #{conn.schema_search_path}" end def self.create_and_migrate_schema(schema_name) conn = ActiveRecord::Base.connection schemas = conn.select_values("select * from pg_namespace where nspname != 'information_schema' AND nspname NOT LIKE 'pg%'") if schemas.include?(schema_name) tables = conn.tables Rails.logger.info "#{schema_name} exists already with these tables #{tables.inspect}" else Rails.logger.info "About to create #{schema_name}" conn.execute "create schema #{schema_name}" end # Save the old search path so we can set it back at the end of this method old_search_path = conn.schema_search_path # Tried to set the search path like in the methods above (from Guy Naor) # conn.execute "SET search_path TO #{schema_name}" # But the connection itself seems to remember the old search path. # If set this way, it works. conn.schema_search_path = schema_name # Directly from databases.rake. # In Rails 2.3.5 databases.rake can be found in railties/lib/tasks/databases.rake file = "#{Rails.root}/db/schema.rb" if File.exists?(file) Rails.logger.info "About to load the schema #{file}" load(file) else abort %{#{file} doesn't exist yet. It's possible that you just ran a migration!} end Rails.logger.info "About to set search path back to #{old_search_path}." conn.schema_search_path = old_search_path end end

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• jQuery Validate - require at least one field in a group to be filled

  - by Nathan Long

  I'm using the excellent jQuery Validate Plugin to validate some forms. On one form, I need to ensure that the user fills in at least one of a group of fields. I think I've got a pretty good solution, and wanted to share it. Please suggest any improvements you can think of. Finding no built-in way to do this, I searched and found Rebecca Murphey's custom validation method, which was very helpful. I improved this in three ways: To let you pass in a selector for the group of fields To let you specify how many of that group must be filled for validation to pass To show all inputs in the group as passing validation as soon as one of them passes validation. So you can say "at least X inputs that match selector Y must be filled." The end result is a rule like this: partnumber: { require_from_group: [2,".productinfo"] } //The partnumber input will validate if //at least 2 `.productinfo` inputs are filled For best results, put this rule AFTER any formatting rules for that field (like "must contain only numbers", etc). This way, if the user gets an error from this rule and starts filling out one of the fields, they will get immediate feedback about the formatting required without having to fill another field first. Item #3 assumes that you're adding a class of .checked to your error messages upon successful validation. You can do this as follows, as demonstrated here. success: function(label) { label.html(" ").addClass("checked"); } As in the demo linked above, I use CSS to give each span.error an X image as its background, unless it has the class .checked, in which case it gets a check mark image. Here's my code so far: jQuery.validator.addMethod("require_from_group", function(value, element, options) { // From the options array, find out what selector matches // our group of inputs and how many of them should be filled. numberRequired = options[0]; selector = options[1]; var commonParent = $(element).parents('form'); var numberFilled = 0; commonParent.find(selector).each(function(){ // Look through fields matching our selector and total up // how many of them have been filled if ($(this).val()) { numberFilled++; } }); if (numberFilled >= numberRequired) { // This part is a bit of a hack - we make these // fields look like they've passed validation by // hiding their error messages, etc. Strictly speaking, // they haven't been re-validated, though, so it's possible // that we're hiding another validation problem. But there's // no way (that I know of) to trigger actual re-validation, // and in any case, any other errors will pop back up when // the user tries to submit the form. // If anyone knows a way to re-validate, please comment. // // For imputs matching our selector, remove error class // from their text. commonParent.find(selector).removeClass('error'); // Also look for inserted error messages and mark them // with class 'checked' var remainingErrors = commonParent.find(selector) .next('label.error').not('.checked'); remainingErrors.text("").addClass('checked'); // Tell the Validate plugin that this test passed return true; } // The {0} in the next line is the 0th item in the options array }, jQuery.format("Please fill out at least {0} of these fields.")); Questions? Comments?

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• Small performance test on a web service

  - by vtortola

  Hi, I'm trying to develop a small application that test how many requests per second can my service support but I think I'm doing something wrong. The service is in an early development stage, but I'd like to have this test handy in order to check in time to time I'm not doing something that decrease the performance. The problem is that I cannot get the web server or the database server go to the 100% of CPU. I'm using three different computers, in one is the web server (WinSrv Standard 2008 x64 IIS7), in other the database (Win 2K - SQL Server 2005) and the last is my computer (Win7 x64 ultimate), where I'll run the test. The computers are connected through a 100 ethernet switch. The request POST is 9 bytes and the response will be 842 bytes. The test launches several threads, and each thread has a "while" loop, in each loop it creates a WebRequest object, performs a call, increment a common counter and waits between 1 and 5 millisencods, then it do it again: static Int32 counter = 0; static void Main(string[] args) { ServicePointManager.DefaultConnectionLimit = 250; Console.WriteLine("Ready. Press any key..."); Console.ReadKey(); Console.WriteLine("Running..."); String localhost = "localhost"; String linuxmono = "192.168.1.74"; String server= "192.168.1.5:8080"; DateTime start = DateTime.Now; Random r = new Random(DateTime.Now.Millisecond); for (int i = 0; i < 50; i++) { new Thread(new ParameterizedThreadStart(Test)).Start(server); Thread.Sleep(r.Next(1, 3)); } Thread.Sleep(2000); while (true) { Console.WriteLine("Request per second :" + counter/DateTime.Now.Subtract(start).TotalSeconds ); Thread.Sleep(3000); } } public static void Test(Object ip) { Guid guid = Guid.NewGuid(); Random r = new Random(DateTime.Now.Millisecond); while (true) { String test = "<lalala/>"; WebRequest req = WebRequest.Create("http://" + (String)ip + "/WebApp/"+guid.ToString()+"/Data/Tables=whatever"); req.Method = "POST"; req.ContentType = "application/xml"; req.Credentials = new NetworkCredential("aaa", "aaa","domain"); Byte[] array = Encoding.UTF8.GetBytes(test); req.ContentLength = array.Length; using (Stream reqStream = req.GetRequestStream()) { reqStream.Write(array, 0, array.Length); reqStream.Close(); } using (Stream responseStream = req.GetResponse().GetResponseStream()) { String response = new StreamReader(responseStream).ReadToEnd(); if (response.Length != 842) Console.Write(" EEEE "); } Interlocked.Increment(ref counter); Thread.Sleep(r.Next(1,5)); } } If I run the test neither of the computers do an excesive CPU usage. Let's say I get a X requests per second, if I run the console application two times at the same moment, I get X/2 request per second in each one... but still the web server is on 30% of CPU, the database server on 25%... I've tried to remove the thread.sleep in the loop, but it doesn't make a big difference. I'd like to put the machines to the maximun, to check how may requests per second they can provide. I guessed that I could do it in this way... but apparently I'm missing something here... What is the problem? Kind regards.

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• OpenGL/SharpGL - Points only on -near surface of Ortho projection?

  - by FTLPhysicsGuy

  When you create points using three dimensions for each point and you use an Ortho projection to view the points, would there be a reason that only the points on the -near surface would appear? For example, if you use (the SharpGL method) gl.Ortho(0, width, height, 0, -10, 10), only the points at z=10 (because the near surface is at -10) actually show up. I'm currently using SharpGL - but I'm hoping the issue I'm having isn't with that particular implementation/library. EDIT: I'm adding the code below that demonstrates the issue. Note that this example requires SharpGL and is in fact a modification of a WPF sample project that comes with the current SharpGL source code (the original sample project is called TwoDSample). The project requires a MainWindow.xaml and a MainWindow.xaml.cs. Here's the xaml: <Window x:Class="TwoDSample.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525" xmlns:my="clr-namespace:SharpGL.WPF;assembly=SharpGL.WPF"> <Grid> <my:OpenGLControl Name="openGLControl1" OpenGLDraw="openGLControl1_OpenGLDraw" OpenGLInitialized="openGLControl1_OpenGLInitialized" Resized="openGLControl1_Resized"/> </Grid> </Window> Here is the code behind: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using SharpGL.Enumerations; namespace TwoDSample { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } // NOTE: I use this to restrict the openGLControl1_OpenGLDraw method to // drawing only once after m_drawCount is set to zero; int m_drawCount = 0; private void openGLControl1_OpenGLDraw(object sender, SharpGL.SceneGraph.OpenGLEventArgs args) { // NOTE: Only draw once after m_drawCount is set to zero if (m_drawCount < 1) { // Get the OpenGL instance. var gl = args.OpenGL; gl.Color(1f, 0f, 0f); gl.PointSize(2.0f); // Draw 10000 random points. gl.Begin(BeginMode.Points); Random random = new Random(); for (int i = 0; i < 10000; i++) { double x = 10 + 400 * random.NextDouble(); double y = 10 + 400 * random.NextDouble(); double z = (double)random.Next(-10, 0); // Color the point according to z value gl.Color(0f, 0f, 1f); // default to blue if (z == -10) gl.Color(1f, 0f, 0f); // Red for z = -10 else if (z == -1) gl.Color(0f, 1f, 0f); // Green for z = -1 gl.Vertex(x, y, z); } gl.End(); m_drawCount++; } } private void openGLControl1_OpenGLInitialized(object sender, SharpGL.SceneGraph.OpenGLEventArgs args) { } private void openGLControl1_Resized(object sender, SharpGL.SceneGraph.OpenGLEventArgs args) { // NOTE: force the draw routine to happen again when resize occurs m_drawCount = 0; // Get the OpenGL instance. var gl = args.OpenGL; // Create an orthographic projection. gl.MatrixMode(MatrixMode.Projection); gl.LoadIdentity(); // NOTE: Basically no matter what I do, the only points I see are those at // the "near" surface (with z = -zNear)--in this case, I only see green points gl.Ortho(0, openGLControl1.ActualWidth, openGLControl1.ActualHeight, 0, 1, 10); // Back to the modelview. gl.MatrixMode(MatrixMode.Modelview); } } }

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• Android: How to track down the origin of a InflateException?

  - by Janusz

  While starting my application I get the following warning in Logcat: 04-09 10:28:17.830: WARN/WindowManager(52): Exception when adding starting window 04-09 10:28:17.830: WARN/WindowManager(52): android.view.InflateException: Binary XML file line #24: Error inflating class <unknown> 04-09 10:28:17.830: WARN/WindowManager(52): at android.view.LayoutInflater.createView(LayoutInflater.java:513) 04-09 10:28:17.830: WARN/WindowManager(52): at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56) 04-09 10:28:17.830: WARN/WindowManager(52): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563) 04-09 10:28:17.830: WARN/WindowManager(52): at android.view.LayoutInflater.inflate(LayoutInflater.java:385) 04-09 10:28:17.830: WARN/WindowManager(52): at android.view.LayoutInflater.inflate(LayoutInflater.java:320) 04-09 10:28:17.830: WARN/WindowManager(52): at android.view.LayoutInflater.inflate(LayoutInflater.java:276) 04-09 10:28:17.830: WARN/WindowManager(52): at com.android.internal.policy.impl.PhoneWindow.generateLayout(PhoneWindow.java:2153) 04-09 10:28:17.830: WARN/WindowManager(52): at com.android.internal.policy.impl.PhoneWindow.installDecor(PhoneWindow.java:2207) 04-09 10:28:17.830: WARN/WindowManager(52): at com.android.internal.policy.impl.PhoneWindow.getDecorView(PhoneWindow.java:1395) 04-09 10:28:17.830: WARN/WindowManager(52): at com.android.internal.policy.impl.PhoneWindowManager.addStartingWindow(PhoneWindowManager.java:818) 04-09 10:28:17.830: WARN/WindowManager(52): at com.android.server.WindowManagerService$H.handleMessage(WindowManagerService.java:8794) 04-09 10:28:17.830: WARN/WindowManager(52): at android.os.Handler.dispatchMessage(Handler.java:99) 04-09 10:28:17.830: WARN/WindowManager(52): at android.os.Looper.loop(Looper.java:123) 04-09 10:28:17.830: WARN/WindowManager(52): at com.android.server.WindowManagerService$WMThread.run(WindowManagerService.java:531) 04-09 10:28:17.830: WARN/WindowManager(52): Caused by: java.lang.reflect.InvocationTargetException 04-09 10:28:17.830: WARN/WindowManager(52): at android.widget.FrameLayout.<init>(FrameLayout.java:79) 04-09 10:28:17.830: WARN/WindowManager(52): at java.lang.reflect.Constructor.constructNative(Native Method) 04-09 10:28:17.830: WARN/WindowManager(52): at java.lang.reflect.Constructor.newInstance(Constructor.java:446) 04-09 10:28:17.830: WARN/WindowManager(52): at android.view.LayoutInflater.createView(LayoutInflater.java:500) 04-09 10:28:17.830: WARN/WindowManager(52): ... 13 more 04-09 10:28:17.830: WARN/WindowManager(52): Caused by: android.content.res.Resources$NotFoundException: Resource is not a Drawable (color or path): TypedValue{t=0x2/d=0x1010059 a=-1} 04-09 10:28:17.830: WARN/WindowManager(52): at android.content.res.Resources.loadDrawable(Resources.java:1677) 04-09 10:28:17.830: WARN/WindowManager(52): at android.content.res.TypedArray.getDrawable(TypedArray.java:548) 04-09 10:28:17.830: WARN/WindowManager(52): at android.widget.FrameLayout.<init>(FrameLayout.java:91) 04-09 10:28:17.830: WARN/WindowManager(52): ... 17 more My Application starts with the following splash screen: <?xml version="1.0" encoding="utf-8"?> <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:windowBackground="@color/white" android:background="@color/white" android:layout_width="fill_parent" android:layout_height="fill_parent" android:foregroundGravity="center"> <ImageView android:id="@+id/ImageView01" android:layout_width="fill_parent" android:layout_height="fill_parent" android:adjustViewBounds="true" android:scaleType="centerInside" android:src="@drawable/splash" android:layout_gravity="center" /> </ScrollView> Splash is the image that is shown in the splash screen. I have those four folders with for storing drawables in my app: /res/drawable-hdpi /res/drawable-ldpi /res/drawable-mdpi /res/drawable-nodpi the splash image has its own version in the first three of them and is displayed properly. Removing the src property from the ImageView removes the image but not the exception. I'm a little bit lost with where to look for the cause of the exception. I even don't know if this is really an issue in this layout file etc. How would you go about finding the cause for this warning?

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• Inconsistent responses from ISAPI DLL in mod_isapi.

  - by William Leader

  I have a ISAPI dll which I created with Delphi 2009, and I have been able to test that it functions as designed when I run it inside of IIS 5.1. However when I attempt to host the web service from within Apache on Windows XP using mod_isapi, I do not get consistent results. The ISAPI dll implements a very simple SOAP service with two methods. One method is a simple echo service that sends back the string sent to it. The second method is used to send a file to the server using a TSoapAttachement (Mutipart MIME). The interface can be descibes as follows IPdiSvc2 = interface(IInvokable) ['{532DCDD7-D66B-4D2C-924E-2F389D3E0A74}'] function Echo(data:string): string; stdcall; function SendFile(request:TFileDescription; attachment: TSOAPAttachment): TSendFileResponse; stdcall; end; What is interesting is if I only call the echo function Apache handles this without error every time. The webservice only returns an error after calling send File, but not every time. There are three outcomes to calling send file that I have observed: A normal result without an error (HTTP 200 OK). A Soap encoded exception with the message: 'Required white space was missing. Line: 11 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML.' (HTTP 500 Internal Error). This also generates a message in the Apache error.log 'Premature end of script headers: MYISAPI.dll' A Soap encoded exception with the message: 'Access violation at address 01A53D57 in module MYISAPI.dll. Read of address 00000000.' (HTTP 200 OK). What I find interesting is that the second third outcomes still occur if I call echo after calling send file. Calling SendFile, SendFile, SendFile, SendFile results in outcomes 1, 2, 3, 1. Calling Echo, SendFile, SendFile, SendFile results in outcomes 1, 1, 2, 3. Calling SendFile, Echo, Echo, SendFile results in outcomes 1, 2, 3, 1. The pattern I am seing is that after a Successful SendFile, the next to requests result in outcomes 2 and 3 regardless of what those two requests are. My guess is that because Apache uses multiple threads to handle multiple requests that each request is getting handled in a slightly different way, and that the DLL may not have been initialized in the same way for each worker thread. I do not think the problem exists in my code as when I attach the debugger to httpd.exe it does recognize the exceptions but it says the exceptions are in non-delphi code meaning that they are happening before the code inside my DLL has a chance to execute. I suspect it may have something to do with the way I have apache configured. My Apache configuration is the defaults created by the 2.2.15 installer for windows with the following addition: <IfModule isapi_module> AddHandler isapi-handler .dll ISAPILogNotSupported on ISAPIFakeAsync on ISAPIAppendLogToErrors on </IfModule> <IfModule alias_module> ScriptAlias /myisapi/ "C:/path/to/myisapi/" </IfModule> <Directory "C:/path/to/myisapi/"> AllowOverride None Options ExecCGI Order allow,deny Allow from all </Directory>

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• mysql-connector-c++ - ‘get_driver_instance’ is not a member of ‘sql::mysql’

  - by rizzo0917

  I am a beginner at c++ and figured the only way I am going to learn is to get dirty with some code. I am trying to build a program that connects to a mysql database. I am using g++, on linux. With no ide. I run "make" and this is my error: hello.cpp:38: error: ‘get_driver_instance’ is not a member of ‘sql::mysql’ make: *** [hello.o] Error 1 Here is my code including makefile. Any Help would be great! Thanks in advance ###BEGIN hello.cpp### #include <stdlib.h> #include <iostream> #include <sstream> #include <stdexcept> #include "mysql_connection.h" #include <cppconn/driver.h> #include <cppconn/exception.h> #include <cppconn/resultset.h> #include <cppconn/statement.h> #include <cppconn/prepared_statement.h> #define EXAMPLE_HOST "localhost" #define EXAMPLE_USER "root" #define EXAMPLE_PASS "" #define EXAMPLE_DB "world" using namespace std; using namespace sql::mysql; int main(int argc, const char **argv) { string url(argc >= 2 ? argv[1] : EXAMPLE_HOST); const string user(argc >= 3 ? argv[2] : EXAMPLE_USER); const string pass(argc >= 4 ? argv[3] : EXAMPLE_PASS); const string database(argc >= 5 ? argv[4] : EXAMPLE_DB); cout << "Connector/C++ tutorial framework..." << endl; cout << endl; try { sql::Driver *driver; sql::Connection *con; sql::Statement *stmt; driver = sql::mysql::get_driver_instance(); con = driver->connect("tcp://127.0.0.1:3306", "user", "password"); stmt = con->createStatement(); stmt->execute("USE " EXAMPLE_DB); stmt->execute("DROP TABLE IF EXISTS test"); stmt->execute("CREATE TABLE test(id INT, label CHAR(1))"); stmt->execute("INSERT INTO test(id, label) VALUES (1, 'a')"); delete stmt; delete con; } catch (sql::SQLException &e) { /* The MySQL Connector/C++ throws three different exceptions: - sql::MethodNotImplementedException (derived from sql::SQLException) - sql::InvalidArgumentException (derived from sql::SQLException) - sql::SQLException (derived from std::runtime_error) */ cout << "# ERR: SQLException in " << __FILE__; cout << "(" << __FUNCTION__ << ") on line " << __LINE__ << endl; /* Use what() (derived from std::runtime_error) to fetch the error message */ cout << "# ERR: " << e.what(); cout << " (MySQL error code: " << e.getErrorCode(); cout << ", SQLState: " << e.getSQLState() << " )" << endl; return EXIT_FAILURE; } cout << "Done." << endl; return EXIT_SUCCESS; } ###END hello.cpp### ###BEGIN Make File### SRCS := hello.cpp OBJS := $(SRCS:.cpp=.o) CXXFLAGS := -Wall -pedantic INCPATHS := -I/home/user/mysql-connector/include/ LIBPATHS := -L/home/user/mysql-connector/lib/ -L/home/user/mysql-connector-c/lib/ LIBS := -static -lmysqlclient -mysqlcppconn-static EXE := MyExecutable $(EXE): $(OBJS) $(CXX) $(OBJS) $(LIBPATHS) $(LIBS) -o $@ .cpp.o: $(CXX) $(CXXFLAGS) $(INCPATHS) -c $< -o $@ ###End Makefile###

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• Multiple viewport problem

  - by PSilo

  I'm setting up so I can switch between either one or four viewports but I got some trouble. In my bottom right viewport I got camera view, the same camera that I can switch to full view on. The other three viewports are working with fixed locations but the bottom right viewport is compressed on the y scale and half of the picture on the x scale is missing. void display(int what) { if(what==5){glViewport(0, 0, w, h); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); ca.lookAt();} if(what==1){glViewport(0, 0, w/2, h/2); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(75,15,-5,0,5,-5,0,1,0);} if(what==2){glViewport(w/2, h/2, w, h); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0,110,0,20,0,20,1,0,0);} if(what==3){glViewport(w/2, 0, w, h/2); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0f, float(320) / float(240), 0.1f, 100.0f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); ca.lookAt();} if(what==4){glViewport(0, h/2, w/2, h); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(185,75,25,0,28,0,0,1,0);} //glMatrixMode(GL_MODELVIEW); //glLoadIdentity(); ////gluLookAt(cos(shared.time) * shared.distance, 10, sin(shared.time) * shared.distance, 0, 0, 0, 0, 1, 0); // Roterar kameran kring origo genom att skapa en ny vymatris varje bildruta ////ca.orbitYaw(0.05); //ca.lookAt(); glClearColor(0, 0, 0, 1); glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); drawScene(); drawCamera(); glutSwapBuffers(); } void viewport(){ glEnable(GL_SCISSOR_TEST); if(!divided_view_port) { glViewport(0, 0, w, h); glScissor(0,0,640,480); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0f, w / h, 0.1f, 100.0f); display(5); } else { ////////////////////// bottom left - working glViewport(0, 0, w/2, h/2); glScissor(0,0,w/2,h/2); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0f, w / h, 0.1f, 300.0f); display(1); ////////////////////// ////////////////////// top right - working glViewport(w/2, h/2, w, h); glScissor(w/2,h/2,w,h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0f, w / h, 0.1f, 300.0f); display(2); ////////////////////// ////////////////////// bottom right -working glViewport(w/2, 0, w, h/2); glScissor(w/2,0,w,h/2); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0f, w / h, 0.1f, 300.0f); display(3); //////////////////////// ////////////////////////// top left glViewport(0, h/2, w/2, h); glScissor(0,h/2,w/2,h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0f, w / h, 0.1f, 300.0f); display(4); /////////////////////////// } glDisable(GL_SCISSOR_TEST); glMatrixMode(GL_MODELVIEW); }

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• CSG operations on implicit surfaces with marching cubes [SOLVED]

  - by Mads Elvheim

  I render isosurfaces with marching cubes, (or perhaps marching squares as this is 2D) and I want to do set operations like set difference, intersection and union. I thought this was easy to implement, by simply choosing between two vertex scalars from two different implicit surfaces, but it is not. For my initial testing, I tried with two spheres circles, and the set operation difference. i.e A - B. One circle is moving and the other one is stationary. Here's the approach I tried when picking vertex scalars and when classifying corner vertices as inside or outside. The code is written in C++. OpenGL is used for rendering, but that's not important. Normal rendering without any CSG operations does give the expected result. void march(const vec2& cmin, //min x and y for the grid cell const vec2& cmax, //max x and y for the grid cell std::vector<vec2>& tri, float iso, float (*cmp1)(const vec2&), //distance from stationary circle float (*cmp2)(const vec2&) //distance from moving circle ) { unsigned int squareindex = 0; float scalar[4]; vec2 verts[8]; /* initial setup of the grid cell */ verts[0] = vec2(cmax.x, cmax.y); verts[2] = vec2(cmin.x, cmax.y); verts[4] = vec2(cmin.x, cmin.y); verts[6] = vec2(cmax.x, cmin.y); float s1,s2; /********************************** ********For-loop of interest****** *******Set difference between **** *******two implicit surfaces****** **********************************/ for(int i=0,j=0; i<4; ++i, j+=2){ s1 = cmp1(verts[j]); s2 = cmp2(verts[j]); if((s1 < iso)){ //if inside circle1 if((s2 < iso)){ //if inside circle2 scalar[i] = s2; //then set the scalar to the moving circle } else { scalar[i] = s1; //only inside circle1 squareindex |= (1<<i); //mark as inside } } else { scalar[i] = s1; //inside neither circle } } if(squareindex == 0) return; /* Usual interpolation between edge points to compute the new intersection points */ verts[1] = mix(iso, verts[0], verts[2], scalar[0], scalar[1]); verts[3] = mix(iso, verts[2], verts[4], scalar[1], scalar[2]); verts[5] = mix(iso, verts[4], verts[6], scalar[2], scalar[3]); verts[7] = mix(iso, verts[6], verts[0], scalar[3], scalar[0]); for(int i=0; i<10; ++i){ //10 = maxmimum 3 triangles, + one end token int index = triTable[squareindex][i]; //look up our indices for triangulation if(index == -1) break; tri.push_back(verts[index]); } } This gives me weird jaggies: It looks like the CSG operation is done without interpolation. It just "discards" the whole triangle. Do I need to interpolate in some other way, or combine the vertex scalar values? I'd love some help with this. A full testcase can be downloaded HERE EDIT: Basically, my implementation of marching squares works fine. It is my scalar field which is broken, and I wonder what the correct way would look like. Preferably I'm looking for a general approach to implement the three set operations I discussed above, for the usual primitives (circle, rectangle/square, plane)

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• iPhone/Obj-C: Accessing a UIScrollView from a View displayed within it.

  - by Daniel I-S

  I'm writing a simple iPhone app which lets a user access a series of calculators. It consists of the following: UITableViewController (RootViewController), with the list of calculators. UIViewController + UIScrollView (UniversalScroller), which represents an empty scroll view - and has a 'displayedViewController' property. UIViewController (Calculators 1-9), each of which contains a view with controls that represents a particular calculator. Each calculator takes 3-5 values via UITextFields and UISliders, and has a 'calculate' button. They can potentially be taller than 460px(iPhone screen height). The idea is: User taps on a particular menu item in the RootViewController. This loads and inits UniversalScroller, ALSO loads and inits the UIViewcontroller for the particular calculator that was selected, sets the displayedViewController property of UniversalScroller to the newly loaded calculator UIViewcontroller, and pushes the UniversalScroller to the front. When the UniversalScroller hits its 'viewDidLoad' event, it sets its contentSize to the view frame size of its 'displayedViewController' object. It then adds the displayedViewController's view as a subview to itself, and sets its own title to equal that of the displayedViewController. It now displays the calculator, along with the correct title, in a scrollable form. Conceptually (and currently; this stuff has all been implemented already), this works great - I can design the calculators how I see fit, as tall as they end up being, and they will automatically be accommodated and displayed in an appropriately configured UIScrollView. However, there is one problem: The main reason I wanted to display things in a UIScrollView was so that, when the on-screen-keyboard appeared, I could shift the view up to focus on the control that is currently being edited. To do this, I need access to the UniversalScroller object that is holding the current calculator's view. On the beganEditing: event of each control, I intended to use the [UniversalScroller.view scrollRectToVisible: animated:] method to move focus to the correct control. However, I am having trouble accessing the UniversalScroller. I tried assigning a reference to it as a property of each calculator UIViewController, but did't seem to have much luck. I've read about using Delegates but have had trouble working out exactly how they work. I'm looking for one of three things: Some explanation of how I can access the methods of a UIScrollView from a UIViewController whose view is contained within it. or Confirmation of my suspicions that making users scroll on a data entry form is bad, and I should just abandon scrollviews altogether and move the view up and down to the relevant position when the keyboard appears, then back when it disappears. or Some pointers on how I could go about redesigning the calculators (which are basically simple data entry forms using labels, sliders and textfields) to be contained within UITableViewCells (presumably in a UITableView, which I understand is a scrollview deep down) - I read a post on SO saying that that's a more pleasing way to make a data entry form, but I couldn't find any examples of that online. Screenshots would be nice. Anything to make my app more usable and naturally 'iPhone-like', since shuffling labels and textboxes around makes me feel like I am building a winforms app! I've only recently started with this platform and language, and despite being largely an Apple skeptic I definitely see the beauty in the way that it works. Help me solve this problem and I might fall in love completely. Dan

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• drupal - using variable_set, hook block and hook menu to save config values then print out in custom

  - by bert

  I am trying to 1) implement the hook menu and variable_set in the block hook and to solicit and store configuration values from user, 2) then use retrieve configuration values and 3) pass them out into a template using theme hook when page is shown. However I need a bit of a push on step two and three! // ===================== file: my_module.php function my_module_block($op = 'list', $delta = 0, $edit = array()) { switch($op) { case 'list': $blocks[0] = array( 'info' => t('Find Something'), // required value - this shows up in your list of blocks 'region' => 'left', // default region on the page 'weight' => 0, // position the block vertically within its column. 'visibility' => 1, // permit the block to be displayed for a given user. 'status' => TRUE, // enabled ); return $blocks; break; // case configure case 'configure': // not used ? // case save (save configuration values) case 'save': variable_set('my_module_text_bottom', $edit['my_module_text_bottom']); variable_set('my_module_text_top', $edit['my_module_text_top']); break; } } function my_module_menu(){ $items = array(); // add menu items $items['my_module'] = array( // add a menu item here... ); // administration setting - callback my_module_admin $items['admin/settings/my_module'] = array( 'title' => 'Lookup on Something', 'description' => 'Description of my module settings page', 'page callback' => 'drupal_get_form', 'page arguments' => array('my_module_admin'), 'access arguments' => array('access administration pages'), 'type' => MENU_NORMAL_ITEM, ); return $items; } // setup administrative default values (see: site configiration) function my_module_admin() { $form = array(); $form['my_module_text_top'] = array( '#type' => 'textarea', '#title' => t('Text of top of page'), '#default_value' => variable_get('my_module_text_top', 'my_module_text_top: This is configurable text found in the module configuration.'), '#size' => 1024, '#maxlength' => 1024, '#description' => t("text above the Find a Retailer block."), '#required' => TRUE, ); $form['my_module_text_bottom'] = array( '#type' => 'textarea', '#title' => t('Text at bottom of page'), '#default_value' => variable_get('my_module_text_bottom', 'my_module_text_bottom: This is configurable text found in the module configuration.'), '#size' => 1024, '#maxlength' => 1024, '#description' => t("text below the Find a Retailer block."), '#required' => TRUE, ); return system_settings_form($form); } // registering a theme function my_module_theme(){ return array( 'my_module_show' => array( 'arguments' => array('content' => "hello"), 'template' => 'my_module_show' ), ); } // implementing a theme function theme_my_module_show($content){ $output = '<ul>$content</ul>'; return $output; } function my_module(){ $output = ''; $variables = ""; $output .= theme('my_module_show', $variables); return $output; } // ===================== file: my_module_show.tpl.php print $text1; print $text2;

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• BlackBerry - TouchEvent on multiple managers

  - by rupesh

  Hi all i am new to blackberry application development here is my question i am using two verticalfieldmanager "layout" and "manager" in my application. layout has three custom button field and layout is inside manager. i am not able to implement touch event , here is my code: public class MenuScreen extends MainScreen { public MenuScreen() { super(Screen.DEFAULT_CLOSE); Bitmap menuBackgroundImage = Bitmap .getBitmapResource("com/greetings/Images/MenuBackground.jpg"); final VerticalFieldManager layout = new VerticalFieldManager() { public boolean touchEvent(TouchEvent message) { int x = message.getGlobalX(1); int y = message.getGlobalY(1); if (getExtent().contains(x, y)) { int fieldI = getFieldAtLocation(x, y); Field field = getField(fieldI); field.setFocus(); return super.touchEvent(message); } return false; } }; ButtonField categories = new ButtonField("Categories") { public void run() { Dialog.alert("one"); } public boolean touchEvent(TouchEvent message) { int x = message.getX(1); int y = message.getY(1); int w = getWidth(); int h = getHeight(); if (x >= 0 && x <= w && y >= 0 && y <= h) { switch (message.getEvent()) { case TouchEvent.DOWN: setFocus(); return true; case TouchEvent.UNCLICK: run(); return true; } } return false; } }; ButtonField help = new ButtonField("Help") { public void run() { Dialog.alert("help"); } public boolean touchEvent(TouchEvent message) { int x = message.getX(1); int y = message.getY(1); int w = getWidth(); int h = getHeight(); if (x >= 0 && x <= w && y >= 0 && y <= h) { switch (message.getEvent()) { case TouchEvent.DOWN: setFocus(); return true; case TouchEvent.UNCLICK: run(); return true; } } return false; } }; ButtonField developer = new ButtonField("Developer") { public void run() { Dialog.alert("Developer"); } public boolean touchEvent(TouchEvent message) { int x = message.getX(1); int y = message.getY(1); int w = getWidth(); int h = getHeight(); if (x >= 0 && x <= w && y >= 0 && y <= h) { switch (message.getEvent()) { case TouchEvent.DOWN: setFocus(); return true; case TouchEvent.UNCLICK: run(); return true; } } return false; } }; layout.add(categories); layout.add(help); layout.add(developer); VerticalFieldManager manager = new VerticalFieldManager() { protected void sublayout(int width, int height) { width = Display.getWidth(); height = Display.getHeight(); super.sublayout(width, height); setPositionChild(layout, width - 245, height - 350); setExtent(width, height); } }; manager.setBackground(BackgroundFactory .createBitmapBackground(menuBackgroundImage)); manager.add(layout); add(manager); } }

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• Simple C# CSV Excel export class

  - by Chris

  Thought this might be handy for someone, this is an extremely simple CSV export class that I needed. Features: Extremely simple to use Escapes commas and quotes so excel handles them fine Exports date and datetimes in timezone-proof format Without further ado: using System; using System.Data.SqlTypes; using System.IO; using System.Text; using System.Collections.Generic; /// <summary> /// Simple CSV export /// Example: /// CsvExport myExport = new CsvExport(); /// /// myExport.AddRow(); /// myExport["Region"] = "New York, USA"; /// myExport["Sales"] = 100000; /// myExport["Date Opened"] = new DateTime(2003, 12, 31); /// /// myExport.AddRow(); /// myExport["Region"] = "Sydney \"in\" Australia"; /// myExport["Sales"] = 50000; /// myExport["Date Opened"] = new DateTime(2005, 1, 1, 9, 30, 0); /// /// Then you can do any of the following three output options: /// string myCsv = myExport.Export(); /// myExport.ExportToFile("Somefile.csv"); /// byte[] myCsvData = myExport.ExportToBytes(); /// </summary> public class CsvExport { /// <summary> /// To keep the ordered list of column names /// </summary> List<string> fields = new List<string>(); /// <summary> /// The list of rows /// </summary> List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>(); /// <summary> /// The current row /// </summary> Dictionary<string, object> currentRow { get { return rows[rows.Count - 1]; } } /// <summary> /// Set a value on this column /// </summary> public object this[string field] { set { // Keep track of the field names, because the dictionary loses the ordering if (!fields.Contains(field)) fields.Add(field); currentRow[field] = value; } } /// <summary> /// Call this before setting any fields on a row /// </summary> public void AddRow() { rows.Add(new Dictionary<string, object>()); } /// <summary> /// Converts a value to how it should output in a csv file /// If it has a comma, it needs surrounding with double quotes /// Eg Sydney, Australia -> "Sydney, Australia" /// Also if it contains any double quotes ("), then they need to be replaced with quad quotes[sic] ("") /// Eg "Dangerous Dan" McGrew -> """Dangerous Dan"" McGrew" /// </summary> string MakeValueCsvFriendly(object value) { if (value == null) return ""; if (value is INullable && ((INullable)value).IsNull) return ""; if (value is DateTime) { if (((DateTime)value).TimeOfDay.TotalSeconds==0) return ((DateTime)value).ToString("yyyy-MM-dd"); return ((DateTime)value).ToString("yyyy-MM-dd HH:mm:ss"); } string output = value.ToString(); if (output.Contains(",") || output.Contains("\"")) output = '"' + output.Replace("\"", "\"\"") + '"'; return output; } /// <summary> /// Output all rows as a CSV returning a string /// </summary> public string Export() { StringBuilder sb = new StringBuilder(); // The header foreach (string field in fields) sb.Append(field).Append(","); sb.AppendLine(); // The rows foreach (Dictionary<string, object> row in rows) { foreach (string field in fields) sb.Append(MakeValueCsvFriendly(row[field])).Append(","); sb.AppendLine(); } return sb.ToString(); } /// <summary> /// Exports to a file /// </summary> public void ExportToFile(string path) { File.WriteAllText(path, Export()); } /// <summary> /// Exports as raw UTF8 bytes /// </summary> public byte[] ExportToBytes() { return Encoding.UTF8.GetBytes(Export()); } }

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• Summer Programming Plans

  - by Gabe

  I've wanted to start "hacking" for many months now. But I put it off in favor of school and other things. Now, though, I'm free for the summer and want to learn as much as I can. I have a rough idea of what I want to try my hand at, but need some guidance as to what specifically - and how - I should learn. This is my plan so far: 1) Get good at programming in general. I plan to read up on how to think/work like a programmer. I'm waiting for the Pragmatic Programmer to arrive, which will be the first book I read. Q: What other books/ebooks should I look at? What more can I do here? 2) Learn/Improve at HTML/CSS. My first project will be to make a personal website/blog for myself using HTML and CSS. ----Then I hope to write/design articles like Dustin Curtis. After I finish this (and learn a programming language) I'll try to create user-based a user-focused website. Q: It's my understanding that just trying to design/manage websites is a good way to learn/improve at HTML/CSS. Is that all correct? 3) Try music development. This might be a sort of stretch for stackoverflow, but I'm interested in mixing/making techno songs. (Think Justice, or Daft Punk, or MSTRKRFT.) Q: I have a Mac. Any ideas on how I could start/learn music making? Any programs I should download, for instance? 4) My main goal: Learning a web development language/framework. I'm a year into learning/using C++. But what I really want to do is develop websites and web apps. I've searched online, and there seems to be great debate over which language/framework to learn first (and which is best). I think I've narrowed it down to three: Ruby (Rails), Python (Django), and PHP (?). Q #1: Which should I learn and use first? (Reasons?) Q #2: One reason I was leaning towards PHP is that I'm taking a PHP development course next semester. Learning it now would make that course easy. If PHP was not the answer to Q #1, is it worth learning both? Or, would it be better to just focus on PHP for this summer and next semester, and then transition thereafter to a better language? 5) iPhone/iPad Programming (Maybe). I've a number of simple, useful app ideas that I'd like to eventually get too. I just bought a Mac, as well as a few app development books. Q #1: Am I spreading myself thin trying to learn all of the above, and objective-C? Q #2: How much harder/easier is objective-C compared to the above languages? Also, how easy is it to learn obj-C after learning a web development language (and some C++)? Q #3: Yes or no? Should I go for it, or just keeep with #1-4 for now? Also: If you have any tips on how I should learn (or how you learned to hack), I'm all ears. I'd be especially interested in how you planned out learning: did you just hack whenever you felt like it, or did you "study" the language a few hours a day, or something else? Thanks so much, guys.

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• Programmatically swap colors from a loaded bitmap to Red, Green, Blue or Gray, pixel by pixel.

  - by eyeClaxton

  Download source code here: http://www.eyeClaxton.com/download/delphi/ColorSwap.zip I would like to take a original bitmap (light blue) and change the colors (Pixel by Pixel) to the red, green, blue and gray equivalence relation. To get an idea of what I mean, I have include the source code and a screen shot. Any help would be greatly appreciated. If more information is needed, please feel free to ask. If you could take a look at the code below, I have three functions that I'm looking for help on. The functions "RGBToRed, RGBToGreen and RGBToRed" I can't seem to come up with the right formulas. unit MainUnit; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, ExtCtrls, StdCtrls; type TMainFrm = class(TForm) Panel1: TPanel; Label1: TLabel; Panel2: TPanel; Label2: TLabel; Button1: TButton; BeforeImage1: TImage; AfterImage1: TImage; RadioGroup1: TRadioGroup; procedure FormCreate(Sender: TObject); procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; var MainFrm: TMainFrm; implementation {$R *.DFM} function RGBToGray(RGBColor: TColor): TColor; var Gray: Byte; begin Gray := Round( (0.90 * GetRValue(RGBColor)) + (0.88 * GetGValue(RGBColor)) + (0.33 * GetBValue(RGBColor))); Result := RGB(Gray, Gray, Gray); end; function RGBToRed(RGBColor: TColor): TColor; var Red: Byte; begin // Not sure of the algorithm for this color Result := RGB(Red, Red, Red); end; function RGBToGreen(RGBColor: TColor): TColor; var Green: Byte; begin // Not sure of the algorithm for this color Result := RGB(Green, Green, Green); end; function RGBToBlue(RGBColor: TColor): TColor; var Blue: Byte; begin // Not sure of the algorithm for this color Result := RGB(Blue, Blue, Blue); end; procedure TMainFrm.FormCreate(Sender: TObject); begin BeforeImage1.Picture.LoadFromFile('Images\RightCenter.bmp'); end; procedure TMainFrm.Button1Click(Sender: TObject); var Bitmap: TBitmap; I, X: Integer; Color: Integer; begin Bitmap := TBitmap.Create; try Bitmap.LoadFromFile('Images\RightCenter.bmp'); for X := 0 to Bitmap.Height do begin for I := 0 to Bitmap.Width do begin Color := ColorToRGB(Bitmap.Canvas.Pixels[I, X]); case Color of $00000000: ; // Skip any Color Here! else case RadioGroup1.ItemIndex of 0: Bitmap.Canvas.Pixels[I, X] := RGBToBlue(Color); 1: Bitmap.Canvas.Pixels[I, X] := RGBToRed(Color); 2: Bitmap.Canvas.Pixels[I, X] := RGBToGreen(Color); 3: Bitmap.Canvas.Pixels[I, X] := RGBToGray(Color); end; end; end; end; AfterImage1.Picture.Graphic := Bitmap; finally Bitmap.Free; end; end; end. Okay, I apologize for not making it clearer. I'm trying to take a bitmap (blue in color) and swap the blue pixels with another color. Like the shots below.

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• This program runs but not correctly; the numbers aren't right.

  - by user320950

  this program runs but not correctly numbers arent right, i read numbers from a file and then when i am using them in the program they are not right.:brief decription of what i am trying to do can someone tell me if something doesnt look right. this is what i have to do: write a program that determines the grade dispersal for 100 students You are to read the exam scores into three arrays, one array for each exam. You must then calculate how many students scored A’s (90 or above), B’s (80 or above), C’s (70 or above), D’s (60 or above), and F’s (less than 60). Do this for each exam and write the distribution to the screen. // basic file operations #include <iostream> #include <fstream> using namespace std; int read_file_in_array(double exam[100][3]); double calculate_total(double exam1[], double exam2[], double exam3[]); // function that calcualates grades to see how many 90,80,70,60 //void display_totals(); double exam[100][3]; int main() { double go,go2,go3; double exam[100][3],exam1[100],exam2[100],exam3[100]; go=read_file_in_array(exam); go2=calculate_total(exam1,exam2,exam3); //go3=display_totals(); cout << go,go2,go3; return 0; } /* int display_totals() { int grade_total; grade_total=calculate_total(exam1,exam2,exam3); return 0; } */ double calculate_total(double exam1[],double exam2[],double exam3[]) { int calc_tot,above90=0, above80=0, above70=0, above60=0,i,j, fail=0; double exam[100][3]; calc_tot=read_file_in_array(exam); for(i=0;i<100;i++) { for (j=0; j<3; j++) { exam1[i]=exam[100][0]; exam2[i]=exam[100][1]; exam3[i]=exam[100][2]; if(exam[i][j] <=90 && exam[i][j] >=100) { above90++; { if(exam[i][j] <=80 && exam[i][j] >=89) { above80++; { if(exam[i][j] <=70 && exam[i][j] >=79) { above70++; { if(exam[i][j] <=60 && exam[i][j] >=69) { above60++; { if(exam[i][j] >=59) { fail++; } } } } } } } } } } } return 0; } int read_file_in_array(double exam[100][3]) { ifstream infile; int exam1[100]; int exam2[100]; int exam3[100]; infile.open("grades.txt");// file containing numbers in 3 columns if(infile.fail()) // checks to see if file opended { cout << "error" << endl; } int num, i=0,j=0; while(!infile.eof()) // reads file to end of line { for(i=0;i<100;i++) // array numbers less than 100 { for(j=0;j<3;j++) // while reading get 1st array or element infile >> exam[i][j]; infile >> exam[i][j]; infile >> exam[i][j]; cout << exam[i][j] << endl; { if (! (infile >> exam[i][j]) ) cout << exam[i][j] << endl; } exam[i][j]=exam1[i]; exam[i][j]=exam2[i]; exam[i][j]=exam3[i]; } infile.close(); } return 0; }

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• What are ProductCode & UpgradeCode & GUID? How to detect if certain application/library is already i

  - by claws

  I've already gone through: http://stackoverflow.com/questions/211192/check-if-the-application-is-already-installed http://stackoverflow.com/questions/488717/detecting-if-a-program-is-already-installed-with-nsis http://nsis.sourceforge.net/Add_uninstall_information_to_Add/Remove_Programs My questions are little more in depth and little more general. So, as you understood my problem is that I want to check if "Certain Applications" are already installed on the user's machine? I'm generating the installer using Advanced Installer. First few questions: What is Upgrade Code? Advanced installer has option, Product Version (identify by Upgrade Code) What is Product Code? Advanced installer Product Version (identify by Product Code) Component is installed : GUID. What is GUID? All the above three has values like this: {49EB7A6A-1CEF-4A1E-9E89-B9A4993963E3} I don't know what these values are but it seems that computer is recognizing software using this kind of strange ID. My required applications are MySQL DBMS MySQL .NET Connector One fact that I discovered is Upgrade Code & Product Code can be extracted from its "msi installer". MySQL Server Installer = mysql-5.1.43-win32.msi Upgrade Code = {49EB7A6A-1CEF-4A1E-9E89-B9A4993963E3} Product Code = {0ECED7D8-FF53-4DC9-958E-C2177F528DE4} GUID (for component Installed) = ???? Uninstall Path = HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{0ECED7D8-FF53-4DC9-958E-C2177F528DE4} Installer = mysql-5.1.46-win32.msi Upgrade Code = {49EB7A6A-1CEF-4A1E-9E89-B9A4993963E3} Product Code = {EA8FDE5A-2B33-4EDD-B7E7-8D179DF731A5} GUID (for component Installed) = ???? Uninstall Path = HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{EA8FDE5A-2B33-4EDD-B7E7-8D179DF731A5} Installer = mysql-essential-5.1.46-win32.msi Upgrade Code = {49EB7A6A-1CEF-4A1E-9E89-B9A4993963E3} Product Code = {AD33AF2C-6485-4106-B012-1D9CDC88A454} GUID (for component Installed) = ???? Uninstall Path = HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{AD33AF2C-6485-4106-B012-1D9CDC88A454} Installer = mysql-essential-5.1.46-win32.msi Upgrade Code = {49EB7A6A-1CEF-4A1E-9E89-B9A4993963E3} Product Code = {9A4DA7EF-A7B9-4282-90AD-10976AA24E69} GUID (for component Installed) = ???? Uninstall Path = HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{9A4DA7EF-A7B9-4282-90AD-10976AA24E69} Observation from above data: UpgradeCode of a software is constant & is irrespective of its version. ProductCode is version specific & it is used by the MSI internally which is actually reasonable because. MSI allows applications of different versions to be installed side by side. I don't know how to find GUID. MySQL ADO .NET Driver Installer = mysql.data.5.2.5.msi Upgrade Code = --- Product Code = {5FD88490-011C-4DF1-B886-F298D955171B} GUID (for component Installed) = ???? Installer = mysql.data.6.2.2.msi Upgrade Code = --- Product Code = {5FD88490-011C-4DF1-B886-F298D955171B} GUID (for component Installed) = ???? UninstallPath =HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{5FD88490-011C-4DF1-B886-F298D955171B} Installer = mysql.data.6.2.3.msi Upgrade Code = --- Product Code = {5FD88490-011C-4DF1-B886-F298D955171B} GUID (for component Installed) = ???? Observations from above data: - surprisingly, it couldn't find UpgradeCode from installer of mysql.data.*.msi. I wonder why? This contradicts with my above observation. - ProductCode for all different versions is same here. This again contradicts my above observations. -I still don't know how to find GUID. Now, What exactly are these ProductCode & UpgradeCode & GUID. Which denotes what? Why are above observations contradicting? I don't care about versions. I don't want to depend on Application Name then how do I check if MySQL driver & MySQL ADO .NET. Does detection become simple if they are .NET assemblies? How to do then? I don't want to ship the assemblies with my deployed files.

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• Using ASP.NET MVC 2 with Ninject 2 from scratch

  - by Rune Jacobsen

  I just did File - New Project last night on a new project. Ah, the smell of green fields. I am using the just released ASP.NET MVC 2 (i.e. no preview or release candidate, the real thing), and thought I'd get off to a good start using Ninject 2 (also released version) with the MVC extensions. I downloaded the MVC extensions project, opened it in VS2008Sp1, built it in release mode, and then went into the mvc2\build\release folder and copied Ninject.dll and Ninject.Web.Mvc.dll from there to the Libraries folder on my project (so that I can lug them around in source control and always have the right version everywhere). I didn't include the corresponding .xml files - should I? Do they just provide intellisense, or some other function? Not a big deal I believe. Anyhoo, I followed the most up-to-date advice I could find; I referenced the DLLs in my MVC2 project, then went to work on Global.asax.cs. First I made it inherit from NinjectHttpApplication. I removed the Application_Start() method, and overrode OnApplicationStarted() instead. Here is that method: protected override void OnApplicationStarted() { base.OnApplicationStarted(); AreaRegistration.RegisterAllAreas(); RegisterRoutes(RouteTable.Routes); // RegisterAllControllersIn(Assembly.GetExecutingAssembly()); } And I also followed the advice of VS and implemented the CreateKernel method: protected override Ninject.IKernel CreateKernel() { // RegisterAllControllersIn(Assembly.GetExecutingAssembly()); return new StandardKernel(); } That is all. No other modifications to the project. You'll notice that the RegisterAllControllersIn() method is commented out in two places above. I've figured I can run it in three different combinations, all with their funky side effects; Running it like above. I am then presented with the standard "Welcome to ASP.NET MVC" page in all its' glory. However, after this page is displayed correctly in the browser, VS shows me an exception that was thrown. It throws in NinjectControllerFactory.GetControllerInstance(), which was called with a NULL value in the controllerType parameter. Notice that this happens after the /Home page is rendered - I have no idea why it is called again, and by using breakpoints I've already determined that GetControllerInstance() has been successfully called for the HomeController. Why this new call with controllerType as null? I really have no idea. Pressing F5 at this time takes me back to the browser, no complaints there. Uncommenting the RegisterAllControllersIn() method in CreateKernel() This is where stuff is really starting to get funky. Now I get a 404 error. Some times I have also gotten an ArgumentNullException on the RegisterAllControllersIn() line, but that is pretty rare, and I have not been able to reproduce it. Uncommenting the RegisterAllControllers() method in OnApplicationStarted() (And putting the comment back on the one in CreateKernel()) Results in behavior that seems exactly like that in point 1. So to keep from going on forever - is there an exact step-by-step guide on how to set up an MVC 2 project with Ninject 2 (both non-beta release versions) to get the controllers provided by Ninject? Of course I will then start providing some actual stuff for injection (like ISession objects and repositories, loggers etc), but I thought I'd get this working first. Any help will be highly appreciated! (Also posted to the Ninject Google Group)

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• Strange WCF Error - IIS hosted - context being aborted

  - by RandomNoob

  I have a WCF service that does some document conversions and returns the document to the caller. When developing locally on my local dev server, the service is hosted on ASP.NET Development server, a console application invokes the operation and executes within seconds. When I host the service in IIS via a .svc file, two of the documents work correctly, the third one bombs out, it begins to construct the word document using the OpenXml Sdk, but then just dies. I think this has something to do with IIS, but I cannot put my finger on it. There are a total of three types of documents I generate. In a nutshell this is how it works SQL 2005 DB/IBM DB2 - WCF Service written by other developer to expose data. This service only has one endpoint using basicHttpBinding My Service invokes his service, gets the relevant data, uses the Open Xml Sdk to generate a Microsoft Word Document, saves it on a server and returns the path to the user. The word documents are no bigger than 100KB. I am also using basicHttpBinding although I have tried wsHttpBinding with the same results. What is amazing is how fast it is locally, and even more that two of the documents generate just fine, its the third document type that refuses to work. To the error message: An error occured while receiving the HTTP Response to http://myservername.mydomain.inc/MyService/Service.Svc. This could be due to the service endpoint binding not using the HTTP Protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the server shutting down). See server logs for more details. I have spent the last 2 days trying to figure out what is going on, I have tried everything, including changing the maxReceivedMessageSize, maxBufferSize, maxBufferPoolSize, etc etc to large values, I even included: <httpRuntime maxRequestLength="2097151" executionTimeout="120"/> To see maybe if IIS was choking because of that. Programatically the service does nothing special, it just constructs the word documents from the data using the Open Xml Sdk and like I said, locally all 3 documents work when invoked via a console app running locally on the asp.net dev server, i.e. http://localhost:3332/myService.svc When I host it on IIS and I try to get a Windows Forms application to invoke it, I get the error. I know you will ask for logs, so yes I have logging enabled on my Host. And there is no error in the logs, I am logging everything. Basically I invoke two service operations written by another developer. MyOperation calls - HisOperation1 and then HisOperation2, both of those calls give me complex types. I am going to look at his code tomorrow, because he is using LINQ2SQL and there may be some funny business going on there. He is using a variety of collections etc, but the fact that I can run the exact same document, lets call it "Document 3" within seconds when the service is being hosted locally on ASP WebDev Server is what is most odd, why would it run on scaled down Cassini and blow up on IIS? From the log it seems, after calling HisOperation1 and HisOperation2 the service just goes into la-la land dies, there is a application pool (w3wp.exe) error in the Windows Event Log. Faulting application w3wp.exe, version 6.0.3790.1830, stamp 42435be1, faulting module kernel32.dll, version 5.2.3790.3311, stamp 49c5225e, debug? 0, fault address 0x00015dfa. It's classified as .NET 2.0 Runtime error. Any help is appreciated, the lack of sleep is getting to me. Help me Obi-Wan Kenobi, you're my only hope.

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• What git branching models actually work - the final question

  - by UncleCJ

  In our company we have successfully deployed git and we are currently using a simple trunk/release/hotfixes branching model. However, this has it's problems, I have some key issues of confusion in the community which would be awesome to have answered here. Maybe my hopes for an Alexander stroke are too great, quite possibly I'll decompose this question into more manageable issues, but here's my first shot. Workflows / branching models - below are the three main descriptions of this I have seen, but they are partially contradicting each other or don't go far enough to sort out the subsequent issues we've run into (as described below). Thus our team so far defaults to not so great solutions. Are you doing something better? gitworkflows(7) Manual Page (nvie) A successful Git branching model (reinh) A Git Workflow for Agile Teams Merging vs rebasing (tangled vs sequential history) - the bids on this are as confusing as it gets. Should one pull --rebase or wait with merging back to the mainline until your task is finished? Personally I lean towards merging since this preserves a visual illustration of on which base a task was started and finished, and I even prefer merge --no-ff for this purpose. It has other drawbacks however. Also many haven't realized the useful property of merging - that it isn't commutative (merging a topic branch into master does not mean merging master into the topic branch). I am looking for a natural workflow - sometimes mistakes happen because our procedures don't capture a specific situation with simple rules. For example a fix needed for earlier releases should of course be based sufficiently downstream to be possible to merge upstream into all branches necessary (is the usage of these terms clear enough?). However it happens that a fix makes it into the master before the developer realizes it should have been placed further downstream, and if that is already pushed (even worse, merged or something based on it) then the option remaining is cherry-picking, with it's associated perils... What simple rules like such do you use? Also in this is included the awkwardness of one topic branch necessarily excluding other topic branches (assuming they are branched from a common baseline). Developers don't want to finish a feature to start another one feeling like the code they just wrote is not there anymore How to avoid creating merge conflicts (due to cherry-pick)? What seems like a sure way to create a merge conflict is to cherry-pick between branches, they can never be merged again? Would applying the same commit in revert (how to do this?) in either branch possibly solve this situation? This is one reason I do not dare to push for a largely merge-based workflow. How to decompose into topical branches? - We realize that it would be awesome to assemble a finished integration from topic branches, but often work by our developers is not clearly defined (sometimes as simple as "poking around") and if some code has already gone into a "misc" topic, it can not be taken out of there again, according to the question above? How do you work with defining/approving/graduating/releasing your topic branches? Proper procedures like code review and graduating would of course be lovely, but we simply cannot keep things untangled enough to manage this - any suggestions? integration branches, illustration please? Vote and comment as much as you'd like, I'll try to keep the issue page clear and informative enough. Thanks! Below is a list of related topics on stackoverflow I have checked out: What are some good strategies to allow deployed applications to be hotfixable? Workflow description for git usage for in-house development Git workflow for corporate Linux kernel development How do you maintain development code and production code? (thanks for this PDF!) git releases management Git Cherry-pick vs Merge Workflow How to cherry-pick multiple commits How do you merge selective files with git-merge? How to cherry pick a range of commits and merge into another branch ReinH Git Workflow git workflow for making modifications you’ll never push back to origin Cherry-pick a merge Proper Git workflow for combined OS and Private code? Maintaining Project with Git Why cant Git merge file changes with a modified parent/master. Git branching / rebasing good practices When will "git pull --rebase" get me in to trouble?

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• Multibinding File-Paths into a Button ControlTemplate

  - by Bill

  I am trying to develop an application that uses a number of images that are stored in a seperate remote file location. The file-paths to the UI elements are stored within the Application Settings. Although I understand how to access the images from Applications Settings using a MultiBinding and a value converter, I'm not sure how to integrate the Multibinding into the ImageButton ControlTemplate below. Can anyone steer me in the right direction? <Image.Source> <MultiBinding Converter="{StaticResource MyConverter}"> <Binding Source="{StaticResource Properties.Settings}" Path="Default.pathToInterfaceImages" /> <Binding Source="ScreenSaver.png"></Binding> </MultiBinding> </Image.Source> <Button Click="btn_ScreenSaver_Click" Style="{DynamicResource ThreeImageButton}" local:ThreeImageButton.Image="C:\Skins\ScreenSaver_UP.png" local:ThreeImageButton.MouseOverImage="C:\Skins\ScreenSaver_OVER.png" local:ThreeImageButton.PressedImage="C:\Skins\ScreenSaver_DOWN.png"/> <Style x:Key="ThreeImageButton" TargetType="{x:Type Button}"> <Setter Property="FontSize" Value="10"/> <Setter Property="Height" Value="34"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Button}"> <StackPanel Orientation="Horizontal" > <Image Name="PART_Image" Source= "{Binding Path=(local:ThreeImageButton.Image), RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Button}}}" /> </StackPanel> <ControlTemplate.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="Source" Value="{Binding Path=(local:ThreeImageButton.MouseOverImage), RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Button}}}" TargetName="PART_Image"/> </Trigger> <Trigger Property="IsPressed" Value="True"> <Setter Property="Source" Value="{Binding Path=(local:ThreeImageButton.PressedImage), RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Button}}}" TargetName="PART_Image"/> </Trigger> <Trigger Property="IsEnabled" Value="False"> <Setter Property="Source" Value="{Binding Path=(local:ThreeImageButton.Image), RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Button}}}" TargetName="PART_Image"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> public class ThreeImageButton : DependencyObject { // Add three new Dependency Properties to the Button Class to hold the // path to each of the images that are bound to the control, displayed // during normal, mouse-over and pressed states. public static readonly DependencyProperty ImageProperty; public static readonly DependencyProperty MouseOverImageProperty; public static readonly DependencyProperty PressedImageProperty; public static ImageSource GetImage(DependencyObject obj) { return (ImageSource)obj.GetValue(ImageProperty); } public static ImageSource GetMouseOverImage(DependencyObject obj) { return (ImageSource)obj.GetValue(MouseOverImageProperty); } public static ImageSource GetPressedImage(DependencyObject obj) { return (ImageSource)obj.GetValue(PressedImageProperty); } public static void SetImage(DependencyObject obj, ImageSource value) { obj.SetValue(ImageProperty, value); } public static void SetMouseOverImage(DependencyObject obj, ImageSource value) { obj.SetValue(MouseOverImageProperty, value); } public static void SetPressedImage(DependencyObject obj, ImageSource value) { obj.SetValue(PressedImageProperty, value); } // Register each property with the control. static ThreeImageButton() { var metadata = new FrameworkPropertyMetadata((ImageSource)null); ImageProperty = DependencyProperty.RegisterAttached("Image", typeof(ImageSource), typeof(ThreeImageButton), metadata); var metadata1 = new FrameworkPropertyMetadata((ImageSource)null); MouseOverImageProperty = DependencyProperty.RegisterAttached("MouseOverImage", typeof(ImageSource), typeof(ThreeImageButton), metadata1); var metadata2 = new FrameworkPropertyMetadata((ImageSource)null); PressedImageProperty = DependencyProperty.RegisterAttached("PressedImage", typeof(ImageSource), typeof(ThreeImageButton), metadata2); } }

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• Understanding the memory consumption on iPhone

  - by zoul

  Hello! I am working on a 2D iPhone game using OpenGL ES and I keep hitting the 24 MB memory limit – my application keeps crashing with the error code 101. I tried real hard to find where the memory goes, but the numbers in Instruments are still much bigger than what I would expect. I ran the application with the Memory Monitor, Object Alloc, Leaks and OpenGL ES instruments. When the application gets loaded, free physical memory drops from 37 MB to 23 MB, the Object Alloc settles around 7 MB, Leaks show two or three leaks a few bytes in size, the Gart Object Size is about 5 MB and Memory Monitor says the application takes up about 14 MB of real memory. I am perplexed as where did the memory go – when I dig into the Object Allocations, most of the memory is in the textures, exactly as I would expect. But both my own texture allocation counter and the Gart Object Size agree that the textures should take up somewhere around 5 MB. I am not aware of allocating anything else that would be worth mentioning, and the Object Alloc agrees. Where does the memory go? (I would be glad to supply more details if this is not enough.) Update: I really tried to find where I could allocate so much memory, but with no results. What drives me wild is the difference between the Object Allocations (~7 MB) and real memory usage as shown by Memory Monitor (~14 MB). Even if there were huge leaks or huge chunks of memory I forget about, the should still show up in the Object Allocations, shouldn’t they? I’ve already tried the usual suspects, ie. the UIImage with its caching, but that did not help. Is there a way to track memory usage “debugger-style”, line by line, watching each statement’s impact on memory usage? What I have found so far: I really am using that much memory. It is not easy to measure the real memory consumption, but after a lot of counting I think the memory consumption is really that high. My fault. I found no easy way to measure the memory used. The Memory Monitor numbers are accurate (these are the numbers that really matter), but the Memory Monitor can’t tell you where exactly the memory goes. The Object Alloc tool is almost useless for tracking the real memory usage. When I create a texture, the allocated memory counter goes up for a while (reading the texture into the memory), then drops (passing the texture data to OpenGL, freeing). This is OK, but does not always happen – sometimes the memory usage stays high even after the texture has been passed on to OpenGL and freed from “my” memory. This means that the total amount of memory allocated as shown by the Object Alloc tool is smaller than the real total memory consumption, but bigger than the real consumption minus textures (real – textures < object alloc < real). Go figure. I misread the Programming Guide. The memory limit of 24 MB applies to textures and surfaces, not the whole application. The actual red line lies a bit further, but I could not find any hard numbers. The consensus is that 25–30 MB is the ceiling. When the system gets short on memory, it starts sending the memory warning. I have almost nothing to free, but other applications do release some memory back to the system, especially Safari (which seems to be caching the websites). When the free memory as shown in the Memory Monitor goes zero, the system starts killing. I had to bite the bullet and rewrite some parts of the code to be more efficient on memory, but I am probably still pushing it. I

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• WPF Combobox binding: can't change selection.

  - by SteveCav

  After wasting hours on this, following on the heels of my Last Problem, I'm starting to feel that Framework 4 is a master of subtle evil, or my PC is haunted. I have three comboboxes and a textbox on a WPF form, and I have an out-of-the-box Subsonic 3 ActiveRecord DAL. When I load this "edit record" form, the comboboxes fill correctly, they select the correct items, and the textbox has the correct text. I can change the TextBox text and save the record just fine, but the comboboxes CANNOT BE CHANGED. The lists drop down and highlight, but when you click on an item, the item selected stays the same. Here's my XAML: <StackPanel Orientation="Horizontal" Margin="10,10,0,0"> <TextBlock Width="80">Asset</TextBlock> <ComboBox Name="cboAsset" Width="180" DisplayMemberPath="AssetName" SelectedValuePath="AssetID" SelectedValue="{Binding AssetID}" ></ComboBox> </StackPanel> <StackPanel Orientation="Horizontal" Margin="10,10,0,0"> <TextBlock Width="80">Status</TextBlock> <ComboBox Name="cboStatus" Width="180" DisplayMemberPath="JobStatusDesc" SelectedValuePath="JobStatusID" SelectedValue="{Binding JobStatusID}" ></ComboBox> </StackPanel> <StackPanel Orientation="Horizontal" Margin="10,10,0,0"> <TextBlock Width="80">Category</TextBlock> <ComboBox Name="cboCategories" Width="180" DisplayMemberPath="CategoryName" SelectedValuePath="JobCategoryID" SelectedValue="{Binding JobCategoryID}" ></ComboBox> </StackPanel> <StackPanel Orientation="Horizontal" Margin="10,10,0,0"> <TextBlock Width="80">Reason</TextBlock> <TextBox Name="txtReason" Width="380" Text="{Binding Reason}"/> </StackPanel> Here are the relevant snips of my code (intJobID is passed in): SvcMgrDAL.Job oJob; IQueryable<SvcMgrDAL.JobCategory> oCategories = SvcMgrDAL.JobCategory.All().OrderBy(x => x.CategoryName); IQueryable<SvcMgrDAL.Asset> oAssets = SvcMgrDAL.Asset.All().OrderBy(x => x.AssetName); IQueryable<SvcMgrDAL.JobStatus> oStatus = SvcMgrDAL.JobStatus.All(); cboCategories.ItemsSource = oCategories; cboStatus.ItemsSource = oStatus; cboAsset.ItemsSource = oAssets; this.JobID = intJobID; oJob = SvcMgrDAL.Job.SingleOrDefault(x => x.JobID == intJobID); this.DataContext = oJob; Things I've tried: -Explicitly setting IsReadOnly="false" and IsSynchronizedWithCurrentItem="True" -Changing the combobox ItemSources from IQueryables to Lists. -Building my own Job object (plain vanilla entity class). -Every binding mode for the comboboxes. The Subsonic DAL doesn't implement INotifyPropertyChanged, but I don't see as it'd need to for simple binding like this. I just want to be able to pick something from the dropdown and save it. Comparing it with my last problem (link at the top of this message), I seem to have something really wierd with data sources going on. Maybe it's a Subsonic thing?

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• [python] voice communication for python help!

  - by Eric

  Hello! I'm currently trying to write a voicechat program in python. All tips/trick is welcome to do this. So far I found pyAudio to be a wrapper of PortAudio. So I played around with that and got an input stream from my microphone to be played back to my speakers. Only RAW of course. But I can't send RAW-data over the netowrk (due the size duh), so I'm looking for a way to encode it. And I searched around the 'net and stumbled over this speex-wrapper for python. It seems to good to be true, and believe me, it was. You see in pyAudio you can set the size of the chunks you want to take from your input audiobuffer, and in that sample code on the link, it's set to 320. Then when it's encoded, its like ~40 bytes of data per chunk, which is fairly acceptable I guess. And now for the problem. I start a sample program which just takes the input stream, encodes the chunks, decodes them and play them (not sending over the network due testing). If I just let my computer idle and run this program it works great, but as soon as I do something, i.e start Firefox or something, the audio input buffer gets all clogged up! It just grows and then it all crashes and gives me an overflow error on the buffer.. OK, so why am I just taking 320 bytes of the stream? I could just take like 1024 bytes or something and that will easy the pressure on the buffer. BUT. If I give speex 1024 bytes of data to encode/decode, it either crashes and says that thats too big for its buffer. OR it encodes/decodes it, but the sound is very noisy and "choppy" as if it only encoded a tiny bit of that 1024 chunk and the rest is static noise. So the sound sounds like a helicopter, lol. I did some research and it seems that speex only can convert 320 bytes of data at time, and well, 640 for wide-band. But that's the standard? How can I fix this problem? How should I construct my program to work with speex? I could use a middle-buffer tho that takes all available data to read from the buffer, then chunk this up in 320 bits and encode/decode them. But this takes a bit longer time and seems like a very bad solution of the problem.. Because as far as I know, there's no other encoder for python that encodes the audio so it can be sent over the network in acceptable small packages, or? I've been googling for three days now. Also there is this pyMedia library, I don't know if its good to convert to mp3/ogg for this kind of software. Thank in in advance for reading this, hope anyone can help me! (:

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