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;