TcpListen和TcpClient的例子

服务端： SERVER    SEND   RECEIVE

   TcpListener tl = new TcpListener(IPAddress.Any, 9999);

         Socket s = tl.AcceptSocket();

         byte[] bt = new byte[1024];

         int count = s.Receive(bt);

         string msg = null;                

         msg = Encoding.Unicode.GetString(bt, 0, count).ToString();

 s.Send(Encoding.Unicode.GetBytes(str));

 tl.Stop();

客户端： CLIENT  SEND   RECEIVE

         TcpClient client = new TcpClient();

   client.Connect("192.168.0.52", 9999);

         client.Client.Send(Encoding.Unicode.GetBytes("get_friend_list"));              

         byte[] word = new byte[1024];

         int count = client.Client.Receive(word);

         string msg = Encoding.Unicode.GetString(word, 0, count).ToString();

   client.Close();