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 WM_DEVMODECHANGE

The WM_DEVMODECHANGE message is sent to all top-level windows whenever the user changes device-mode settings.

A window receives this message through its WindowProc function.

    LRESULT CALLBACK WindowProc(
     HWND hwnd,       // handle to window
     UINT uMsg,       // WM_DEVMODECHANGE
     WPARAM wParam,   // not used
     LPARAM lParam    // device name (LPCTSTR)
    );

Parameters

• wParam
This parameter is not used.
• lParam
Pointer to a string that specifies the device name.

Return Values

An application should return zero if it processes this message.

Remarks

This message cannot be sent directly to a window. To send the WM_DEVMODECHANGE message to all top-level windows, use the SendMessageTimeout function with the hWnd parameter set to HWND_BROADCAST.

Requirements

• Windows NT/2000/XP/Vista: Included in Windows NT 3.1 and later.
• Windows 95/98/Me: Included in Windows 95 and 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