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 WM_SIZING

The WM_SIZING message is sent to a window that the user is resizing. By processing this message, an application can monitor the size and position of the drag rectangle and, if needed, change its size or position.

A window receives this message through its WindowProc function.

    LRESULT CALLBACK WindowProc(
      HWND hwnd,       // handle to window
      UINT uMsg,       // WM_SIZING
      WPARAM wParam,   // edge of window
      LPARAM lParam    // drag rectangle (LPRECT)
    );

Parameters

• wParam Specifies which edge of the window is being sized. This parameter can be one or more of the following values. Value Meaning WMSZ_BOTTOM Bottom edge WMSZ_BOTTOMLEFT Bottom-left corner WMSZ_BOTTOMRIGHT Bottom-right corner WMSZ_LEFT Left edge WMSZ_RIGHT Right edge WMSZ_TOP Top edge WMSZ_TOPLEFT Top-left corner WMSZ_TOPRIGHT Top-right corner
• lParam Pointer to a RECT structure with the screen coordinates of the drag rectangle. To change the size or position of the drag rectangle, an application must change the members of this structure.

Return Values

An application should return TRUE if it processes this message.

Requirements

  Windows NT/2000 or later: Requires Windows NT 4.0 or later.
  Windows 95/98/Me: Requires Windows 95 or later.
  Header: Declared in Winuser.h; include Windows.h.

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Notebook exported on Monday, 7 July 2008, 18:56:50 PM Eastern Daylight Time