WM_ENDSESSION

The WM_ENDSESSION message is sent to an application after the system processes the results of the WM_QUERYENDSESSION message. The WM_ENDSESSION message informs the application whether the session is ending.

WM_ENDSESSION 
fEndSession = (BOOL) wParam;     // end-session flag 
fLogOff =  lParam                // logoff flag 
 

Parameters

fEndSession

Value of wParam. Specifies whether the session is being ended. If the session is being ended, this parameter is TRUE; otherwise, it is FALSE.

fLogOff

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 processes this message, it should return zero.

Remarks

If the fEndSession parameter is TRUE, the session can end any time after all applications have returned from processing this message. Therefore, an application should perform all tasks required for termination before returning from this message.

The application need not call the DestroyWindow or PostQuitMessage function when the session is ending.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in winuser.h.

See Also

System Shutdown Overview, System Shutdown Messages, DestroyWindow, PostQuitMessage, WM_QUERYENDSESSION