Microsoft KB Archive/105520

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ACC1x: GP Fault with PostMessage to an ADK Application

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Q105520

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The information in this article applies to:


 * Microsoft Access Distribution Kit, version 1.1

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SYMPTOMS
If you attempt to close a Microsoft Access Distribution Kit application by sending a WM_CLOSE message from another application using the PostMessage Windows API function call, a general protection (GP) fault will occur.

The sample code

  x = PostMessage(hWnd, WM_CLOSE, 0, 0)

will result in a GP fault when run in languages such as Microsoft Visual Basic, Microsoft Windows C, or Access Basic.

RESOLUTION
Use the WM_DESTROY window message instead of the WM_CLOSE message to close a run-time application. The following sample code demonstrates how to use the WM_DESTROY message:

  x = PostMessage(hWnd, WM_DESTROY, 0, 0)

STATUS
Microsoft has confirmed this to be a problem in the Microsoft Access Distribution Kit version 1.1. This problem no longer occurs in the Microsoft Access Developer's Toolkit version 2.0.