NT中的关闭计算机，重新登陆的实现
在NT中要实现以上的功能，首先必须获得SE_SHUTDOWN_NAME权限后，才能调用ExitWindowsEx;这是和Windows95的不同
//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 WinExitInNT( iFlags : integer ) : boolean;
begin
Result := True;
if( SetPrivilege( ''SeShutdownPrivilege''
True ) )then
begin
if( not ExitWindowsEx( iFlags
0 ) )then
begin
Result := False;
end;
SetPrivilege( ''SeShutdownPrivilege''
False )
end
else begin
// handle errors
Result := False;
end;
end;
//Enabled or DisEnabled the SE_SHUTDOWN_NAME privilege
//sPrivilegeName:
// ''SE_SHUTDOWN_NAME''
//bEnabled :
// Enabled or DisEnabled ''SE_SHUTDOWN_NAME'' privilege
function SetPrivilege(sPrivilegeName : string;
bEnabled : boolean )
: boolean;
var
TPPrev
TP : TTokenPrivileges;
Token : THandle;
dwRetLen : DWord;
begin
Result := False;
//opens the access token associated with a process.
OpenProcessToken(
GetCurrentProcess
//handle to process
TOKEN_ADJUST_PRIVILEGES //Required to change the privileges specified in an access token.
or TOKEN_QUERY
//Required to query the contents of an access token.
Token);
TP.PrivilegeCount := 1;
//retrieves the locally unique identifier (LUID) used on a specified system to
//locally represent the specified privilege name.
if( LookupPrivilegeValue(
Nil
//attempts to find the privilege name on the local system.
PChar( sPrivilegeName )
// address of string specifying the privilege
TP.Privileges[ 0 ].LUID ) // address of locally unique identifier
)then
begin
if( bEnabled )then //Give this privileges
begin
TP.Privileges[ 0 ].Attributes := SE_PRIVILEGE_ENABLED;
end
else begin //NOT Give this privileges
TP.Privileges[ 0 ].Attributes := 0;
end;
dwRetLen := 0;
//enables or disables privileges in the specified access token.
Result := AdjustTokenPrivileges(
Token
// handle to token that contains privileges
False
//modifies privileges
TP
// pointer to new privilege information
SizeOf( TPPrev )
// size
in bytes
of the TPPrev buffer
TPPrev
// receives original state of changed privileges
dwRetLen // receives required size of the TPPrev buffer
);
end;
CloseHandle( Token );
end;
