ShutDown ou Reboot : WM_QUERYENDSESSION ou WM_ENDSESSION

LRESULTCALLBACKWindowProc(
HWNDhwnd,       // handle to window
UINTuMsg,       // message identifier
WPARAMwParam,   // not used
LPARAMlParam    // logoff option
);

Parameters

hwnd

A handle to the window.

uMsg

The WM_QUERYENDSESSION identifier.

wParam

This parameter is reserved for future use.

lParam

This parameter can be one or more of the following values. If this parameter is 0, the system is shutting down or restarting (it is not possible to determine which event is occurring).

Value	Meaning
ENDSESSION_CLOSEAPP 0x1	The application is using a file that must be replaced, the system is being serviced, or system resources are exhausted. For more information, see Guidelines for Applications.
ENDSESSION_LOGOFF 0x80000000	The user is logging off. For more information, see Logging Off.

Note that this parameter is a bit mask. To test for this value, use a bit-wise operation; do not test for equality.

lParam

If this parameter is zero, the system is shutting down or restarting (it is not possible to determine which event is occurring).

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