在编写NT服务程序时，为什么不能用FINDWINDOWEX来查找窗口句柄？总是返回0

Question

在编写NT服务程序时，为什么不能用FINDWINDOWEX来查找窗口句柄？总是返回0
procedure TService1.ServiceExecute(Sender: TService);
var
   OldTime1,OldTime2,NewTime:DWORD;
begin
   OldTime2:=GetTickcount
   WHILE NOT Terminated DO begin
      newtime:=GetTickcount;
       if newtime-oldtime2>=700 then begin
        oldtime2:=newtime;
        ReadIni
      end;
      SERVICETHREAD.ProcessRequests(FALSE);
  end;
end;
procedure ReadIni( );
VAR
 INI:TINIFILE;
begin
 ini:=tinifile.Create('E:\MYDELPHI\KillJW\SysSv\KillJWP.INI');
 ini.WriteString('SETUP','NOW',TIMETOSTR(NOW));
 ini.Writestring('SETUP','BARHWND', inttohex(findwindowex(0,0,'SciCalc','计算器'),0));
 ini.free;
end;

Answer 1

服务程序 中很多 事情都做不来！