最简单的TTcpServer与TTcpClient通信实例-Delphi

interface

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

type
//工作流程:
//程序运行后点[连接]连接TcpClient和TcpServer
//点[发送]将edit1中的文本发送到TcpServer,TcpServer接收到以后添加到Mserver,并回复一条消息.
//TcpClient1收到TcpServer回复的消息后添加到TcpServer
//所有控件都说到了吧?Let's Go!
  TFrmMain = class(TForm) 
    Edit1: TEdit; 
    Button1: TButton;  //连接
    Button2: TButton;  //发送
    Mserver: TMemo;
    MClient: TMemo;
    TcpServer1: TTcpServer;   //active:=True;host:=127.0.0.1;port:=2011;其它默认值
    TcpClient1: TTcpClient;   //remotehost:=127.0.0.1;remoteport:=2011;其它默认值
    procedure TcpServer1Accept(Sender: TObject;
      ClientSocket: TCustomIpClient);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

//这个类实现TTcpClient接收TTcpserver回复的消息
  TClientReceiveThread = class(TThread)
    procedure Execute; override;
  end;

var
  FrmMain: TFrmMain;
  ClientReceiveThread: TClientReceiveThread;

implementation

{$R *.dfm}

procedure TClientReceiveThread.Execute;
begin
  with FrmMain do
  begin
    while TcpClient1.Connected do  //死循环!必须的!!!
      MClient.Lines.Add(TcpClient1.Receiveln);
  end;
end;

//TcpServer1的OnAccept事件
procedure TFrmMain.TcpServer1Accept(Sender: TObject;
  ClientSocket: TCustomIpClient);
var
  s: String;
begin
  while ClientSocket.connected do  //死循环!必须的!!!
  begin
    s := ClientSocket.Receiveln;  //收
    MServer.Lines.Add(s);
    s := DateTimeToStr(Now); 
    ClientSocket.Sendln(s);  //发
  end;
end;

procedure TFrmMain.Button1Click(Sender: TObject);
begin
//连接服务器,如果成功创建客户端接收线程
  if TcpClient1.Connect then ClientReceiveThread := TClientReceiveThread.Create(false);
end;

procedure TFrmMain.Button2Click(Sender: TObject);
begin
  TcpClient1.Sendln(Edit1.Text);
end;

//真的很简单,最后一句话:

end.

转自：http://blog.sina.com.cn/s/blog_5383794d0100nt9u.html