1 //侦听
 2          private void Listen()
 3         {
 4             try
 5             {
 6                 listener = new TcpListener(5656);
 7                 listener.Start();
 8                 while (listenerRun)
 9                 {
10                     s = listener.AcceptSocket();
11                     Byte[] stream = new Byte[80];
12                     int i = s.Receive(stream);
13                     string message = System.Text.Encoding.UTF8.GetString(stream);
14                     //判断message类型
15                      txtRecord.AppendText(message);
16                     //ReceiveFile();
17                  }
18             }
19             catch (Exception e)
20             {
21                 MessageBox.Show(e.Message);
22             }
23         }
24        
25         //发送信息
26         private void Send()
27         {
28             try
29             {
30                 //信息
31                 string Msg = txtNickName.Text + "\r\n" + txtMsg.Text+"\r\n";
32                 client = new TcpClient(txtIP.Text, 5656);
33                 NetworkStream netStream = client.GetStream();
34                 StreamWriter reqStreamW = new StreamWriter(netStream);
35                 reqStreamW.Write(Msg);
36                 reqStreamW.Flush();
37                 reqStreamW.Close();
38                 client.Close();
39                 txtRecord.AppendText(Msg);
40                 txtMsg.Clear();
41 
42                 //SendFile();
43             }
44             catch (Exception)
45             {
46                 throw;
47             }
48         }

 1 //发送文件
 2         private void SendFile()
 3         {
 4             if (strFile != "")//strFile是全局变量，用于保存发送发的文件路径
 5             {
 6                 //发送传送文件请求
 7                 isFile = true;//isFile是个bool类型的全局变量，初始值为false，当为true是在P2P另一端弹出是否接收文件对话框
 8             }
 9             //对方允许接收文件
10             if (ready == true)//ready是bool类型全局变量，初始值为false，用于判断对方是否接收文件
11             {
12                 //准备发送
13                 FileStream file = new FileStream(strFile, FileMode.Open, FileAccess.Read);
14                 BinaryReader binaryReader = new BinaryReader(file);
15                 byte[] b = new byte[4098];
16                 int data;
17                 txtRecord.AppendText("正在发送文件...");
18                 while ((data=binaryReader.Read(b,0,4098))!=0)
19                 {
20                     client.Client.Send(b, data, SocketFlags.None);
21                 }
22                 client.Client.Shutdown(SocketShutdown.Both);
23                 binaryReader.Close();
24                 file.Close();
25             }
26             else
27             {
28                 txtRecord.AppendText("对方拒绝接收文件!");
29             }
30         }
31         //接收文件
32         private void ReceiveFile()
33         {
34             //对方发送文件
35             if (isFile = true)
36             {
37                 if (MessageBox.Show("对方给你发送文件，是否接收？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
38                 {
39                     if (sfdFile.ShowDialog() == DialogResult.OK)
40                     {
41                         //开始接收文件
42                         sfdFile.FileName = "文件";
43                         txtRecord.AppendText("等待接收文件...");
44                         FileStream fs = new FileStream("D:\\",FileMode.OpenOrCreate,FileAccess.Write);
45                         BinaryWriter binaryWrite = new BinaryWriter(fs);
46                         int count;
47                         byte[] b = new byte[4098];
48                         while ((count=s.Receive(b,4098,SocketFlags.None))!=0)
49                         {
50                             binaryWrite.Write(b, 0, count);
51                         }
52                         binaryWrite.Close();
53                         fs.Close();
54                         txtRecord.AppendText("文件传输完毕!");
55                     }
56                 }
57                 else
58                 {
59                     //拒绝接收文件
60                     ready = false;
61 
62                 }
63 
64                 isFile = false;
65             }
66         }