delphi 程序全屏显示无标题栏，覆盖整个屏幕

delphi 程序全屏显示无标题栏，覆盖整个屏幕，这个在做工控机或屏保时有用的，所以记下

procedure TMainFrm.FormCreate(Sender: TObject);

begin

with MainFrm do begin

{ Position form }
        Top := 0 ;
        Left := 0 ;
        { Go full screen}
        BorderStyle := bsNone ;
        WindowState  := wsmaximized;
        ClientWidth  := Screen.Width ;
        ClientHeight := Screen.Height;
        Refresh;
        SetForegroundWindow(Handle) ;
        SetActiveWindow(Application.Handle) ;

end;

end;