If you are developing iPhone application and trying to use UIButton on ‘Navigation Bar’ instead of ' ‘difficult to use’ ‘Bar Button Item’, you need a button image that exactly looks like Bar Button.
As I couldn’t find the button background on net, I created it myself using Paint.NET. Here it is for you.
I’ve been associate with an Innovation Lab from quite a some time and observing for life how a genuine ideas turn into a success. Though I’ve never been able to own a killer existing idea, I can still depict some characteristics of successful innovative idea (based on guts but without example or stories - bad bad to convince people).
In order to avoid confusion and/or be inline with OOP concepts, WPF style will not allow you to concatenate multiple style in one control. Instead, you can use ‘BasedOn’ property (of Style element) to inherit from the other style. It is possible to create chain of inheritance but multiple inheritance is not supported by default. Initially I though it is not possible until I came across this amazing link: http://swdeveloper.wordpress.com/2009/01/03/wpf-xaml-multiple-style-inheritance-and-markup-extensions/
It shows use of MarkupExtension to enable inheritance from multiple styles (in actual, your triggers and setters will be merged. Duplicates will be overwritten by the second style that you define)
Happy interfacing!
You get this exception when you try to upload any file in your Vanilla Forum (Version 1) using any Attachment extension :
You are not allowed to upload ‘FileName’. the requested file type: 'FileType’
Add specified type as allowed type. Steps to do so follow here:
Remove check for allowed types. Note that this is not very safe for public forum but it’s ‘ok’ for internal forum with known and responsible user. Steps to do so follow here:
Recently I was got a weird error on my Windows CE code (.NET compact framework) which was asynchronously listening for UDP (or may be same for TCP) messages.
Error Message: The IAsyncResult object was not returned from the corresponding asynchronous method on this class.
CallStack for debug purpose:
at System.Net.Sockets.Socket.EndReceiveFrom()
at BallyTech.SocketListener.UdpSocketListener.OnReceive()
at System.Net.LazyAsyncResult.InvokeCallback()
at WorkerThread.doWork()
at WorkerThread.doWorkI()
at WorkItem.doWork()
at System.Threading.Timer.ring()
When frequently Open/Close UDP sockets, above exception comes while closing one socket and start listening on another socket on the same port. OnReceive method is called (only once) for the previous (closed) socket while doing “Start Listening” on new socket on the same port. As old socket is already dereferenced and closed, you will get above socket exception on EndReceiveFrom or EndReceive method.
In short, you have to ignore the calls of your OnReceive (or similar) for Old socket which you no longer use i.e. closed sockets.
Note that when you call BeginReceiveFrom to start listening for messages, it returns an instance of IAsyncResult. Don’t ignore this and store it into class level private variable (let’s say variable name currentAsyncResult).
Now make modification into your OnReceive method to ignore any message which is not for currentAsyncResult.
private void OnReceive(IAsyncResult ar)
{
try
{
if (ar == currentAynchResult)
{
IPEndPoint ipeSender = new IPEndPoint(IPAddress.Any, 0);
EndPoint epSender = (EndPoint)ipeSender;
//Error comes here if we didn't have (ar == currentAynchResult) check
int bytesRead = udpSocket.EndReceiveFrom(ar, ref epSender);
//process further
}
else
{
//Ignore
}
BeginReceive();
}
catch (Exception ex)
{
//Log exception. Don't throw exception. Most probably BeginReceive failed.
}
}
Happy Networking!
You must be hating OpenCV 2.0 by now :) But don’t worry your pain will go soon (if yes, please write a comment). The biggest pain is that you will have to compile your OpenCV using CMake and all those stuff (as explained here). But if you are content with C or C++ and not interested in debugging inside OpenCV or Python then read further.
Download and Install, Emgu which is actually .NET wrapper for OpenCV but we will just use their precious .lib files which otherwise is pain in neck to generate (Download Emgu from here: http://sourceforge.net/projects/emgucv/)
After Emgu installation, Open Visual Studio and follow these steps:
1. Go to Tool –> Options –> Projects and Solutions –> VC++ Directories
2. Now see a combobox “Show Directories for” and select “Include files” and add, “C:\Program Files\Emgu\Emgu CV\opencv\include\opencv” (verify, as program file location may differ if you are using 64 bit operating system)
3. Now in the same combobox select “Library files” and add, “C:\Program Files\Emgu\Emgu CV\lib\release”
4. Now go to your VC++ project, right click and go to Properties –> Configuration Properties –> Linker –> Input –> Additional Dependencies and add these lib files (which is at C:\Program Files\Emgu\Emgu CV\lib\release) cv200.lib cvaux200.lib cxcore200.lib highgui200.lib (check library name, it may change according to OpenCV version used for the Emgu)
5. That’s it. Done for now. Take shot at compiling your VC++ code downloaded from internet ;)
NOTE: If you are interested in going into OpenCV library code while debugging then this may not be the best solution for you as Emgu only gives release .lib files. You will have to generate ‘debug’ lib files as described in http://mirror2image.wordpress.com/2009/10/20/switching-to-opencv-2-0-with-vs2005/
I am not sure but this same should help to configure VS 2010 also.
namespace System
{
//attributes blah blah blah
public struct Int32 //implements blah blah blah....
{
internal int m_value;
//… other code with methods with ‘int’ as return type or parameter
}
}public struct Int32
{
public Int32 m_value;
public Int32 GetMe()
{
return this;
}
}
public struct Int32
{
// Fields
public int m_value;
// Methods
public unsafe int GetMe()
{
return *(((int*) this));
}
}
