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The WM_QUERYENDSESSION message is sent when the user chooses to end the Windows session or when an application calls the ExitWindows function. If any application returns zero, the Windows session is not ended. Windows stops sending WM_QUERYENDSESSION messages as soon as one application returns zero.

After processing this message, Windows sends the WM_ENDSESSION message with the wParam parameter set to the results of the WM_QUERYENDSESSION message.


nSource = (UINT) wParam;    // source of end-session request 

fLogOff = lParam            // logoff flag 



Reserved for future use.
Value of lParam. Indicates whether the user is logging off or shutting down the system. Supported values include: ENDSESSION_LOGOFF.

Return Values

If an application can terminate conveniently, it should return TRUE; otherwise, it should return FALSE.


By default, the DefWindowProc function returns TRUE for this message.

Windows NT: When an application returns TRUE for this message, it receives the WM_ENDSESSION message and it is terminated, regardless of how the other applications respond to the WM_QUERYENDSESSION message.

Windows 95: After all applications return TRUE for this message, they receive the WM_ENDSESSION and they are terminated.

See Also

DefWindowProc, ExitWindows, WM_ENDSESSION 

file: /Techref/os/win/api/win32/mess/src/msg27_10.htm, 2KB, , updated: 2000/4/7 12:20, local time: 2022/8/17 21:09,

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