How to Log Off the Current User
Applications can use the
ExitWindows or
ExitWindowsEx function to log off the current user.
By default, when an application uses
ExitWindows or
ExitWindowsEx to log off, the system sends the
WM_QUERYENDSESSION message to each window. Applications agree to terminate by returning TRUE
when they receive this message. If any application returns FALSE, the log-off
operation is canceled.
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.
To force all application to terminate, use
ExitWindowsEx, and specify the EXW_FORCE flag. This prevents the system from sending
WM_QUERYENDSESSION messages.
The system also sends the CTRL_LOGOFF_EVENT control signal to every process
during a log-off operation. A console application can register a
HandlerRoutine to process these messages.
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