Microsoft KB Archive/64329

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INFO: Windows Message-Processing Caveats

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Q64329

3.00 3.10 WINDOWS kbprg

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1

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SUMMARY
Do not call any function that may cause control to yield to another application during the processing of any of the following messages:

  WM_ACTIVATE WM_ACTIVATEAPP WM_CREATE WM_INITDIALOG WM_NCCREATE Certain messages are used to notify applications of some change in Windows's internal status. While processing one of these messages, an application cannot call any function that may result in control being yielded to another application. Forbidden functions include message-processing functions such as MessageBox, DialogBox, GetMessage, and PeekMessage.

Violating this caveat may cause Windows to exhibit strange visual behavior.

Additional query words: 3.00 3.10

Keywords : kb16bitonly kbSDKPlatform kbWndw kbWndwMsg

Issue type : kbinfo

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310