C# SOCKET UDP通信实例

最新推荐文章于 2025-05-27 14:09:16 发布

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最新推荐文章于 2025-05-27 14:09:16 发布

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转自:http://blog.youkuaiyun.com/adamchin/article/details/6295010

服务端：

[c-sharp]view plaincopy 
   
 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：

[c-sharp]view plaincopy 
   
 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();  
         }  
     }  
 }  