Microsoft KB Archive/110793

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BUG: SetWindowPlacement and ptMin.x or ptMax.x = -1

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Q110793

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The information in this article applies to:


 * Microsoft Win32 Software Development Kit (SDK)
 * Microsoft Windows Software Development Kit (SDK) 3.1

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SYMPTOMS
Passing an X coordinate value of -1 to SetWindowPlacement causes the parameter to be ignored. If ptMinPosition.x is set to -1, SetWindowPlacement won't reset the minimized window coordinate; this is also true for ptMaxPosition.x. This was undocumented in the Windows 3.1 SDK documentation.

CAUSE
This problem is caused by the use of -1 as a special value. A value of -1 in the X coordinate causes the API (application programming interface) to use the window's current coordinate for the specified parameter.

RESOLUTION
This behavior may be a problem for application developers because they may want to set the maximized or minimized horizontal coordinate of a window to -1. To avoid this problem, the developer should trap values of -1, and use a value of -2 or 0 (zero) as appropriate.

STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

Additional query words:

Keywords : kbOSWinNT kbOSWin2000 kbOSWin2000bug kbSDKWin32 kbGrpDSUser kbWndw kbWndwProp

Issue type : kbbug

Technology : kbWin32SDKSearch kbAudDeveloper kbWin3xSearch kbSDKSearch kbWin32sSearch kbWinSDKSearch kbWinSDK310