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Author Topic: Setting window icon and heap corruption.  (Read 1401 times)

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TomCatFort

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Setting window icon and heap corruption.
« on: December 03, 2010, 12:49:38 am »
I'm trying to set the icon of my window to match the one that is visible in file explorer. And doing it was a success, but when I closed the window (and after it disappears) i got an error window that my application is stopped working (I was debugging it). Here is my code:
Code: [Select]

using (Bitmap icon = Icon.ExtractAssociatedIcon(Assembly.GetExecutingAssembly().Location).ToBitmap())
{
    unsafe
    {
        BitmapData data = icon.LockBits(new Rectangle(0, 0, icon.Width, icon.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
        byte* ptr = (byte*)data.Scan0;
        int size = data.Width * data.Height * 4;
        byte[] pixels = new byte[size];
        for (int i = 0; i < size; i++)
        {
            pixels[i] = ptr[i];
        }
        //Swap chanels.
        for (int i = 0; i < size / 4; i++)
        {
            byte t = pixels[i * 4 + 0];
            pixels[i * 4 + 0] = pixels[i * 4 + 2];
            pixels[i * 4 + 2] = t;
        }
        SetIcon((uint)icon.Width, (uint)icon.Height, pixels);
        icon.UnlockBits(data);
    }
}

If I comment out that whole code block, everything is fine. It happens even if the SetIcon line is commented out.

Here is the error report in that window:
Code: [Select]

Problem signature:
  Problem Event Name: APPCRASH
  Application Name: AppName.vshost.exe
  Application Version: 10.0.30319.1
  Application Timestamp: 4ba2084b
  Fault Module Name: StackHash_d340
  Fault Module Version: 6.1.7600.16385
  Fault Module Timestamp: 4a5bdb3b
  Exception Code: c0000374
  Exception Offset: 000cdcbb
  OS Version: 6.1.7600.2.0.0.256.1
  Locale ID: 1038
  Additional Information 1: d340
  Additional Information 2: d340cfbcf5d2a1596ea02401d3971e0b
  Additional Information 3: f1b1
  Additional Information 4: f1b10f8b730cb6e83e0c8b6ce5c965b2


I would be happy even if the only thing you can help me is show a way to load it from a png file using C#. To do so I misses a method that is available in C++ if I remember well.

TomCatFort

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Setting window icon and heap corruption.
« Reply #1 on: December 03, 2010, 01:09:49 am »
Interesting! Nothing bad happens if this line does not run:
Code: [Select]

using (Bitmap icon = Icon.ExtractAssociatedIcon(Assembly.GetExecutingAssembly().Location).ToBitmap())

I replaced that line with this:
Code: [Select]

using (Bitmap icon = new Bitmap(32, 32))

Looks like ExtractAssociatedIcon has some problems.