Microsoft KB Archive/105520

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ACC1x: GP Fault with PostMessage() to an ADK Application


The information in this article applies to:

  • Microsoft Access Distribution Kit, version 1.1


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.


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) 


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.


Microsoft Windows version 3.1 "Programmer's Reference," Volume 2

Additional query words: GPF ADK

Keywords : kberrmsg kbprg
Issue type : kbbug
Technology :

Last Reviewed: November 4, 2000
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