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Delphi

Unit1.pas：源码内容

							unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, ScktComp;
type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    Panel1: TPanel;
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
var
  Form1: TForm1;
  ServerSocket1: TServerSocket;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
  ServerSocket1:=TServerSocket.Create(self);
  ServerSocket1.Active:=true;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
  ServerSocket1.Free;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
  i:integer;
begin
  ListBox1.Items.Clear;
  for i:=1 to 10000 do
    begin
      ServerSocket1.Close;
      ServerSocket1.Port:=i;
      try
        ServerSocket1.Open;
      except
        ListBox1.Items.Add(IntToStr(i)+'端口被打开');
      end;
    end;
end;
end.

						