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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| user32.lib
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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ExitWindowsEx
The ExitWindowsEx function either logs off, shuts down, or shuts down and restarts the system.
BOOL ExitWindowsEx(
UINT uFlags,
| // shutdown operation
| DWORD dwReserved
| // reserved
| );
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Parameters
uFlags
Specifies the type of shutdown. This parameter must be some combination of the
following values:
Value
| Meaning
| EWX_FORCE
| Forces processes to terminate. When this flag is set, Windows does not send
the messages WM_QUERYENDSESSION and WM_ENDSESSION to the applications currently
running in the system. This can cause the applications to lose data. Therefore,
you should only use this flag in an emergency.
| EWX_LOGOFF
| Shuts down all processes running in the security context of the process that
called the ExitWindowsEx function. Then it logs the user off.
| EWX_POWEROFF
| Shuts down the system and turns off the power. The system must support the
power-off feature.
Windows NT: The calling process must have the SE_SHUTDOWN_NAME privilege. For more
information, see the following Remarks section.
Windows 95: Security privileges are not supported or required.
| EWX_REBOOT
| Shuts down the system and then restarts the system.
Windows NT: The calling process must have the SE_SHUTDOWN_NAME privilege. For more
information, see the following Remarks section.
Windows 95: Security privileges are not supported or required.
| EWX_SHUTDOWN
| Shuts down the system to a point at which it is safe to turn off the power.
All file buffers have been flushed to disk, and all running processes have
stopped.
Windows NT: The calling process must have the SE_SHUTDOWN_NAME privilege. For more
information, see the following Remarks section.
Windows 95: Security privileges are not supported or required.
|
dwReserved
Reserved; this parameter is ignored.
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error
information, call GetLastError.
Remarks
The ExitWindowsEx function returns as soon as it has initiated the shutdown. The shutdown or
logoff then proceeds asynchronously.
During a shutdown or log-off operation, applications that are shut down are
allowed a specific amount of time to respond to the shutdown request. If the time
expires, Windows displays a dialog box that allows the user to forcibly shut
down the application, to retry the shutdown, or to cancel the shutdown request.
If the EWX_FORCE value is specified, Windows always forces applications to
close and does not display the dialog box.
The ExitWindowsEx function sends a separate notification message, CTRL_SHUTDOWN_EVENT or
CTRL_LOGOFF_EVENT as the situation warrants, to console processes. A console process
routes these messages to its HandlerRoutine functions, which are added and removed by calls to the SetConsoleCtrlHandler function. ExitWindowsEx sends these notification messages asynchronously; thus, an application cannot
assume that the console notification messages have been handled when a call to ExitWindowsEx returns.
Windows NT: To shut down or restart the system, the calling process must use the AdjustTokenPrivileges function to enable the SE_SHUTDOWN_NAME privilege. For more information about
security privileges, see Privileges.
Windows 95: Security privileges are not supported or required.
See Also
AdjustTokenPrivileges, ExitWindows, HandlerRoutine, SetConsoleCtrlHandler
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