C# SOCKET UDP通信实例

服务端：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Net; using System.Net.Sockets; using System.Threading; namespace UdpServer { public partial class UdpServer : Form { //创建一个Thread类 private Thread thread1; //创建一个UdpClient对象，来接收消息 private UdpClient udpReceive; private UdpClient udpSend; public UdpServer() { InitializeComponent(); } private void BtnSend_Click(object sender, EventArgs e) { //初始化UdpClient udpSend = new UdpClient(); //允许发送和接收广播数据报 udpSend.EnableBroadcast = true; //必须使用组播地址范围内的地址 IPEndPoint iep = new IPEndPoint(IPAddress.Parse("224.100.0.10"), 8001); //将发送内容转换为字节数组 byte[] bytes = System.Text.Encoding.UTF8.GetBytes(TbxMessage.Text); //设置重传次数 int retry = 0; while (true) { try { //发送组播信息 udpSend.Send(bytes, bytes.Length, iep); break; } catch { if (retry < 3) { retry++; continue; } else { DialogResult result = MessageBox.Show("发送失败！"); break; } } } //清空TbxMesage中的内容 TbxMessage.Clear(); //光标还原 TbxMessage.Focus(); } private void ReceiveMessage() { //在本机指定的端口接收 IPEndPoint remoteIpEndIPoint = new IPEndPoint(IPAddress.Any, 8002); udpReceive = new UdpClient(remoteIpEndIPoint); IPEndPoint iep = new IPEndPoint(IPAddress.Any, 0); //接收从远程主机发送过来的信息 while (true) { //ref表示引用类型的 IPPoint实例接收消息 byte[] receiveBytes = udpReceive.Receive(ref iep); string returnData = Encoding.UTF8.GetString(receiveBytes); string message = "来自" + iep.ToString() + "的消息"; //显示消息 并以message为消息的标题 DialogResult result = MessageBox.Show(returnData, message); } } private void UdpServer_Load(object sender, EventArgs e) { //初始化该线程并指定线程执行时要调用的方法 thread1 = new Thread(new ThreadStart(ReceiveMessage)); //启动线程 thread1.Start(); } private void UdpServer_FormClosing(object sender, FormClosingEventArgs e) { //关闭UdpClient连接 udpReceive.Close(); udpSend.Close(); //终止线程 thread1.Abort(); } } }

 

客户端：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Net; using System.Net.Sockets; using System.Threading; namespace myUdpClient { public partial class myUdpClient : Form { //创建一个Thread实例 private Thread thread1; //创建一个UdpClient实例 private UdpClient udpReceive; private UdpClient udpSend; private byte[] bytes; //private DialogResult result; public myUdpClient() { InitializeComponent(); } private void myUdpClient_Load(object sender, EventArgs e) { thread1 = new Thread(new ThreadStart(ReceiveMessage)); thread1.Start(); } private void ReceiveMessage() { //在本机指定的端口接收 udpReceive = new UdpClient(8001); //将套接字加入组播组 udpReceive.JoinMulticastGroup(IPAddress.Parse("224.100.0.10"), 50); //接收从远程主机发送过来的信息 IPEndPoint iep = new IPEndPoint(IPAddress.Any, 0); while (true) { //ref表示引用类型的 IPPoint实例接收消息 try { bytes = udpReceive.Receive(ref iep); } catch (SocketException e) { DialogResult result = MessageBox.Show("发送失败！"); } string str = Encoding.UTF8.GetString(bytes, 0, bytes.Length); string message = "来自" + iep.ToString() + "的消息"; //显示消息 并以message为消息的标题 DialogResult res = MessageBox.Show(str, message); } } private void BtnSend_Click(object sender, EventArgs e) { //初始化UdpClient udpSend = new UdpClient(); //实际使用时应将127.0.0.1改为服务器的远程IP IPAddress remoteIPAddress = IPAddress.Parse("127.0.0.1"); IPEndPoint remoteIPEndPoint = new IPEndPoint(remoteIPAddress, 8002); //将发送内容转换为字节数组 byte[] bytes = System.Text.Encoding.UTF8.GetBytes(TbxMessage.Text); //设置重传次数 int retry = 0; while (true) { try { udpSend.Send(bytes, bytes.Length, remoteIPEndPoint); break; } catch (SocketException se) { if (retry < 3) { retry++; continue; } else { DialogResult result = MessageBox.Show("发送失败！"); break; } } } //清空TbxMesage中的内容 TbxMessage.Clear(); //光标还原 TbxMessage.Focus(); //关闭UdpClient } private void myUdpClient_FormClosing(object sender, FormClosingEventArgs e) { //关闭连接 udpReceive.Close(); udpSend.Close(); //终止线程 thread1.Abort(); } } }