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

 Last reviewed: November 2, 1995
Article ID: Q110793
The information in this article applies to:
  • Microsoft Windows Software Development Kit (SDK) versions 3.1
  • Microsoft Win32 Application Programming Interface (API) included with: 

        - Microsoft Windows NT versions 3.5 and 3.51
    - Microsoft Windows 95 version 4.0

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

Microsoft has confirmed this to be a bug in the products list above.

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.

Additional reference words: 3.10 3.50 3.51 4.00 95
KBCategory: kbui kbbuglist
KBSubcategory: UsrWndw

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Last reviewed: November 2, 1995
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