unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ComCtrls, ExtCtrls, StdCtrls, ToolWin, Menus;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}


procedure TForm1.FormCreate(Sender: TObject);
var hr :thandle;
begin
     hr:=CreateEllipticRgn(0,0,width,height);//定義橢圓窗口(win API函數(shù))
     setwindowrgn(handle,hr,true); //設(shè)置橢圓窗口
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
     Close;
end;

end.