delphi窗体固定在桌面上

procedure WndProc(var Message: TMessage); override;
procedure FormCreate(Sender: TObject);
begin
windows.SetParent(Self.Handle,FindWindowEx(FindWindow('Progman',nil),0,'shelldll_defview',nil));//将窗口设置为屏幕的子窗口
//以下显示桌面
keybd_event(91,0,0,0);
keybd_event(77,0,0,0);
keybd_event(77,0,KEYEVENTF_KEYUP,0);
keybd_event(91,0,KEYEVENTF_KEYUP,0);
end;