UDP客户端代码 - using System;
- using System.Text;
- using System.Net;
- using System.Net.Sockets;
-
- namespace Client
- {
- class Program
- {
- //客户端 Socket对象
- private static Socket clientSocket;
- //服务器端 终点
- private static EndPoint epServer;
- //接收数据的字符数组
- private static byte[] receiveData;
-
- public static void Main(string[] args)
- {
- //客户端Socket对象实例化
- clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
- //设置服务器端IP地址和对应端口
- IPEndPoint server = new IPEndPoint(IPAddress.Parse("192.168.1.165"), 11000);
- //实例化服务器端 终点
- epServer = (EndPoint)server;
- string msg; //要发送的消息
- byte[] sendData; //要发送的字符串
- while (true) {
- msg = Console.ReadLine(); //输入要发送的消息
- if (msg == "exit") break; //当输入“exit”时,退出客户端程序
- //将消息通过ASCII编码转换为字符数组,
- //如果要发送汉字或其他特殊符号,可以采用UTF-8
- sendData = Encoding.ASCII.GetBytes(msg);
- //开始异步发送消息
- //参数:sendData 要发送的数据
- //参数:0: 要发送数据的起始位置
- //参数:sendData.Length: 要发送数据的字节数
- //参数:SocketFlags.None: 按位组合方式
- //参数:epServer: 接收方设备(包含IP和端口)
- //参数:new AsyncCallback(SendData): 委托
- //参数:null: 请求的状态信息
- clientSocket.BeginSendTo(sendData, 0, sendData.Length, SocketFlags.None,
- epServer, new AsyncCallback(SendData), null);
- //实例化接收数据的字符数组
- //若在声明时已经初始化,此处依然要进行重新初始化
- //当上次接收的数据长度大于本次,则该数组里包含上次接收的残留数据
- //比如:上次接收“你个小逗逼”。本次接收“开玩笑”。
- //则数组中的数据为:“开玩笑逗逼”。
- receiveData = new byte[1024];
- //开始异步接收消息
- //参数部分与异步发送部分对应,基本一致
- clientSocket.BeginReceiveFrom(receiveData, 0, receiveData.Length, SocketFlags.None,
- ref epServer, new AsyncCallback(ReceiveData), null);
- }
- }
-
- //异步发送消息的委托函数
- private static void SendData(IAsyncResult iar)
- {
- //完成异步发送
- clientSocket.EndSend(iar);
- }
-
- //异步接收消息的委托函数
- private static void ReceiveData(IAsyncResult iar)
- {
- //完成异步接收 recv 表示接收到的字节数
- int recv = clientSocket.EndReceive(iar);
- //将接收到的数据打印出来
- Console.WriteLine("Server: " + Encoding.ASCII.GetString(receiveData, 0, recv));
- }
-
- }
- }
复制代码 UDP服务器端代码
- using System;
- using System.Text;
- using System.Net;
- using System.Net.Sockets;
-
- namespace Server
- {
- class AsyncUdpServer
- {
- //服务器端Socket对象
- private static Socket serverSocket;
- //接收数据的字符数组
- private static byte[] receiveData = new byte[1024];
-
- public static void Main(string[] args)
- {
- //实例化服务器端Socket对象
- serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
- //服务器端的IP和端口,IPAddress.Any实际是:0.0.0.0,表示任意,基本上表示本机IP
- IPEndPoint server = new IPEndPoint(IPAddress.Any, 11000);
- //Socket对象跟服务器端的IP和端口绑定
- serverSocket.Bind(server);
- //客户端的IP和端口,端口 0 表示任意端口
- IPEndPoint clients = new IPEndPoint(IPAddress.Any, 0);
- //实例化客户端 终点
- EndPoint epSender = (EndPoint)clients;
- //开始异步接收消息 接收后,epSender存储的是发送方的IP和端口
- serverSocket.BeginReceiveFrom(receiveData, 0, receiveData.Length, SocketFlags.None,
- ref epSender, new AsyncCallback(ReceiveData), epSender);
- Console.WriteLine("Listening...");
- Console.ReadLine();
- }
-
- private static void SendData(IAsyncResult iar)
- {
- serverSocket.EndSend(iar);
- }
-
- private static void ReceiveData(IAsyncResult iar)
- {
- //客户端的IP和端口,端口 0 表示任意端口
- IPEndPoint client = new IPEndPoint(IPAddress.Any, 0);
- //实例化客户端 终点
- EndPoint epSender = (EndPoint)client;
- //结束异步接收消息 recv 表示接收到的字符数
- int recv = serverSocket.EndReceiveFrom(iar, ref epSender);
- //将接收到的数据打印出来,发送方采用什么编码方式,此处就采用什么编码方式 转换成字符串
- Console.WriteLine("Client:" + Encoding.ASCII.GetString(receiveData, 0, recv));
- //定义要发送回客户端的消息,采用ASCII编码,
- //如果要发送汉字或其他特殊符号,可以采用UTF-8
- byte[] sendData = Encoding.ASCII.GetBytes("hello");
- //开始异步发送消息 epSender是上次接收消息时的客户端IP和端口信息
- serverSocket.BeginSendTo(sendData, 0, sendData.Length, SocketFlags.None,
- epSender, new AsyncCallback(SendData), epSender);
- //重新实例化接收数据字节数组
- receiveData = new byte[1024];
- //开始异步接收消息,此处的委托函数是这个函数本身,递归
- serverSocket.BeginReceiveFrom(receiveData, 0, receiveData.Length, SocketFlags.None,
- ref epSender, new AsyncCallback(ReceiveData), epSender);
- }
-
- }
- }
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