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 WM_DISPLAYCHANGE

The WM_DISPLAYCHANGE message is sent to all windows when the display resolution has changed.

A window receives this message through its WindowProc function.

    LRESULT CALLBACK WindowProc(
      HWND hwnd,       // handle to window
      UINT uMsg,       // WM_DISPLAYCHANGE
      WPARAM wParam,   // image depth
      LPARAM lParam    // screen resolution
    );

Parameters

• wParam Specifies the new image depth of the display, in bits per pixel.
• lParam The low-order word specifies the horizontal resolution of the screen. The high-order word specifies the vertical resolution of the screen.

Remarks

This message is only sent to top-level windows. For all other windows it is posted.

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