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二、被控方的程序（Server端）：

ServerSocket1的Port设为：2058。程序界面如下：



源程序如下：

unit main;

interface

uses

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

type

TMainForm = class(TForm)

Panel1: TPanel;

Panel2: TPanel;

Panel3: TPanel;

Memo1: TMemo;

Button1: TButton;

Label1: TLabel;

ServerSocket1: TServerSocket;

procedure ServerSocket1Listen(Sender: TObject;

Socket: TCustomWinSocket);

procedure ServerSocket1ClientConnect(Sender: TObject;

Socket: TCustomWinSocket);

procedure ServerSocket1ClientDisconnect(Sender: TObject;

Socket: TCustomWinSocket);

procedure ServerSocket1ClientRead(Sender: TObject;

Socket: TCustomWinSocket);

procedure Button1Click(Sender: TObject);

procedure FormClose(Sender: TObject; var Action: TCloseAction);

private

procedure UpdateState;//更新当前的连接信息

{ Private declarations }

public

{ Public declarations }

end;

var

MainForm: TMainForm;

implementation

{$R *.DFM}

procedure TMainForm.UpdateState;

begin

Label1.Caption:='在线人数为:'+IntToStr(ServerSocket1.Socket.ActiveConnections);

end;

procedure TMainForm.ServerSocket1Listen(Sender: TObject;

Socket: TCustomWinSocket);

begin

UpdateState;

end;

procedure TMainForm.ServerSocket1ClientConnect(Sender: TObject;

Socket: TCustomWinSocket);

begin

UpdateState;

end;

procedure TMainForm.ServerSocket1ClientDisconnect(Sender: TObject;

Socket: TCustomWinSocket);

begin

UpdateState;
end;

procedure TMainForm.ServerSocket1ClientRead(Sender: TObject;

Socket: TCustomWinSocket);

var

s:string;

begin

s:=Socket.ReceiveText;

Memo1.Lines.Add('从客户端接收的信息为：'+s);

Socket.SendText('接收信息成功！');

end;

procedure TMainForm.Button1Click(Sender: TObject);

begin

if Button1.Caption='启动' then

begin

Button1.Caption:='停止';

ServerSocket1.Active:=False;

ServerSocket1.Active:=True;

end else

begin

Button1.Caption:='启动';

ServerSocket1.Active:=False;

end;

end;

procedure TMainForm.FormClose(Sender: TObject; var Action: TCloseAction);

begin

if ServerSocket1.Active then

ServerSocket1.Active:=False;

end;

end.

　　这样，程序就编写成功。运行一下看看自己的劳动成果吧！先运行Server端的程序，然后再运行Client端的程序。界面如下：


　　以上程序在Delphi 5.0和 window 98下运行通过。

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