简单P2P聊天

 1 //监听
 2 private void Listen()
 3         {
 4             try
 5             {
 6                 tcpl = new TcpListener(4567);
 7                 tcpl.Start();
 8                 statusBar1.Text = "正在监听";
 9 
10                 while(listenerRun)
11                 {
12                     Socket s = tcpl.AcceptSocket();
13                     Byte[] stream = new Byte[80];
14                     int i=s.Receive(stream) ;
15                     string message = System.Text.Encoding.UTF8.GetString(stream);
16                     richTextBox1.AppendText(message);
17                 }
18             }
19             catch(System.Security.SecurityException)
20             {
21                 MessageBox.Show("防火墙安全错误！","错误",
22                     MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
23             }
24             catch(Exception)
25             {            
26                 statusBar1.Text = "已停止监听！";
27             }
28         }

 1 //发送
 2 private void Send()
 3         {
 4             try
 5             {
 6                 string msg = "<"+textBox3.Text+">"+textBox2.Text;
 7                 TcpClient tcpc = new TcpClient(textBox1.Text, 4567);
 8                 NetworkStream tcpStream = tcpc.GetStream();
 9 
10                 StreamWriter reqStreamW = new StreamWriter(tcpStream);
11                 reqStreamW.Write(msg);
12                 reqStreamW.Flush();
13                 tcpStream.Close();
14                 tcpc.Close();
15                 richTextBox1.AppendText(msg);
16                 textBox2.Clear();
17             }
18             catch(Exception)
19             {
20                 statusBar1.Text = "目标计算机拒绝连接请求！";
21             }
22         }