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Editorial Team
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Asked: 2026-06-09T21:31:39+00:00

Why I’m getting A Generic Error occurred in GDI+ Exception ? IntPtr hicon =

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Why I’m getting “A Generic Error occurred in GDI+” Exception ? 

IntPtr hicon = tempBitmap.GetHicon();             
Icon bitmapIcon = Icon.FromHandle(hicon);            
return bitmapIcon;

The error occurred when my application has been running for more than 30 minutes. (I am converting System.Drawing.Bitmap to System.Drawing.Icon every second)

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1 Answer

  1. Editorial Team

    That’s caused by a handle leak. You can diagnose the leak with TaskMgr.exe, Processes tab. View + Select Columns and tick Handles, GDI Objects and USER Objects. Observe these columns while your program is running. If my guess is right, you’ll see the GDI Objects value for your process steadily climbing. When it reaches 10,000 then the show is over, Windows refuses to allow you to leak more objects.

    The Remarks section for Icon.FromHandle says:

    When using this method you must dispose of the resulting icon using the DestroyIcon method in the Win32 API to ensure the resources are released.

    That’s good advice but usually pretty painful to do. You can find a hack to force the Icon object to own the handle, and automatically release it, in this answer. Relevant code is after the “Invoke private Icon constructor” section.

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