procedure TForm1.Button1Click(Sender: TObject);
var
a: TRect;
begin
a.Left := Form1.Left;
a.Top := Form1.Top;
a.Right := Form1.Left + Form1.Width;
a.Bottom := Form1.Top + Form1.Height;
ClipCursor(@a);
end;
转载于:https://www.cnblogs.com/28088191/archive/2008/06/14/1222150.html