C#/.Net

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学习这个类，首先需要了解基本的TCP/IP 和UDP 协议，对端口都有一定的理解……

以下是我总结的重要的几点

1.利用Tcp协议编程
1)服务器端：
a)建立TCP监听器TcpListener对象。
TcpListener tl=new TcpListener(端口号);
b)启动监听器
tl.Start();
c）用监听器获取连接进来的套接字（Socket）
Socket s=myList.AcceptSocket();
d)通过Socket的Receive方法获取客户端发送的数据
byte [] result=new byte[1024];
int k=s.Receive(result);
e)通过Socket的Send方法向客户端发送数据
byte[] st=System.Text.Encoding.Default.GetBytes(“text”);
s.Send(st);
f)在通讯结束后，需要释放资源结束监听
s.Close();
tl.Stop();
2)客户端：
a)建立TCP客户端TcpClient对象。
TcpClient tcpclnt = new TcpClient();
b)连接服务器
tcpclnt.Connect(IP地址字符串，端口号);
c）获得客户端网络传输流
Stream stm =tcpclnt.GetStream();
d)通过Stream的Write方法向服务器端发送的数据
e)通过Stream的Read方法读取服务器段发来的数据
f)在通讯结束后，需要释放资源，结束和服务器的连接
tcpclnt.Close();
2.利用UDP协议编程
a)建立UDP客户端UdpClient对象。
UdpClient uc=new UdpClient(端口号);
b)连接对方远程主机
uc.Connect(IP地址，对方远程主机的端口号）;
c)通过uc的Receive方法获取远程主机发送来的数据
IPEndPoint ip=new IPEndPoint(IPAddress.Parse(IP字符串),端口号);
byte[] b=uc.Receive(ref ip);
e)通过uc的Send方法向远程主机发送数据
byte[] st=System.Text.Encoding.Default.GetBytes(“text”);
uc.Send(st);
f)在通讯结束后，需要释放资源
uc.Close();

如果你已在此地址上做了发送数据的socket或tcpclient或udp,那么这个监听和发送在同一个端口上就会发生错误的。

using System; using System.IO; using System.Net; using System.Net.Sockets; using System.Text; class MyTcpListener { public static void Main() { TcpListener server=null; try { // Set the TcpListener on port 13000. Int32 port = 13000; IPAddress localAddr = IPAddress.Parse("127.0.0.1"); // TcpListener server = new TcpListener(port); server = new TcpListener(localAddr, port); // Start listening for client requests. server.Start(); // Buffer for reading data Byte[] bytes = new Byte[256]; String data = null; // Enter the listening loop. while(true) { Console.Write("Waiting for a connection... "); // Perform a blocking call to accept requests. // You could also user server.AcceptSocket() here. TcpClient client = server.AcceptTcpClient(); Console.WriteLine("Connected!"); data = null; // Get a stream object for reading and writing NetworkStream stream = client.GetStream(); int i; // Loop to receive all the data sent by the client. while((i = stream.Read(bytes, 0, bytes.Length))!=0) { // Translate data bytes to a ASCII string. data = System.Text.Encoding.ASCII.GetString(bytes, 0, i); Console.WriteLine("Received: {0}", data); // Process the data sent by the client. data = data.ToUpper(); byte[] msg = System.Text.Encoding.ASCII.GetBytes(data); // Send back a response. stream.Write(msg, 0, msg.Length); Console.WriteLine("Sent: {0}", data); } // Shutdown and end connection client.Close(); } } catch(SocketException e) { Console.WriteLine("SocketException: {0}", e); } finally { // Stop listening for new clients. server.Stop(); } Console.WriteLine("\nHit enter to continue..."); Console.Read(); } }

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