Mega Code Archive
Programmatically logoff a user, shutdown or reboot
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If your program needs to programmatically logoff a user, shutdown or reboot the computer, then you may use the following function with the appropriate parameter:
WinExit(EWX_LOGOFF); // one of these 3 only :-)
WinExit(EWX_REBOOT);
WinExit(EWX_SHUTDOWN);
See the source for the flags EWX_POWEROFF and EWX_FORCE.
The function SetPrivilege() is a necessary helper function.
The other document referenced at the top in the See-Also section is a slight modification of this code snippet, but it works basically the same way.
function SetPrivilege (sPrivilegeName: string; bEnabled: Boolean) : Boolean;
var
TPPrev,
TP : TTokenPrivileges;
Token : THandle;
dwRetLen : DWORD;
begin
result := False;
OpenProcessToken (GetCurrentProcess, TOKEN_ADJUST_PRIVILEGES or TOKEN_QUERY, @Token);
TP.PrivilegeCount := 1;
if LookupPrivilegeValue (nil, PChar (sPrivilegeName), TP.Privileges[0].LUID) then
begin
if bEnabled then
TP.Privileges[0].Attributes := SE_PRIVILEGE_ENABLED
else
TP.Privileges[0].Attributes := 0;
dwRetLen := 0;
result := AdjustTokenPrivileges (Token, False, TP, SizeOf (TPPrev), TPPrev,
dwRetLen)
end;
CloseHandle (Token)
end;
//
// iFlags:
//
// one of the following must be
// specified
//
// EWX_LOGOFF
// EWX_REBOOT
// EWX_SHUTDOWN
//
// following attributes may be
// combined with above flags
//
// EWX_POWEROFF
// EWX_FORCE : terminate processes
//
function WinExit (iFlags: integer) : Boolean;
begin
result := true;
if SetPrivilege ('SeShutdownPrivilege', true) then
begin
if (not ExitWindowsEx (iFlags, 0)) then
begin
// handle errors...
result := False
end;
SetPrivilege ('SeShutdownPrivilege', False)
end
else
begin
// handle errors...
result := False
end
end;
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