unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ScktComp;

type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  ServerSocket1:TServerSocket;
implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
    I : integer;
begin
    ListBox1.Items.Clear;
    for I := 0 to 10000 do begin
        ServerSocket1.Close;
        ServerSocket1.Port := I;
        try
            ServerSocket1.Open;
        except
             ListBox1.Items.Add(IntToStr(I) + '端口被打開!');
        end;
    end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
    ServerSocket1:=TServerSocket.Create(self);
    ServerSocket1.Active:=true;
end;

end.