C # create a UDP server and receive client data

C # create a UDP server and receive client data

Server Object Class Library:

Using System; using System. collections. generic; using System. linq; using System. text; using System. net. sockets; using System. net; using System. threading; using System. IO; namespace UdpChatExample {////// UDP Server Object ///Public class UDPServerClass {public delegate void MessageHandler (string Message); // defines the delegate event public event MessageHandler MessageArrived; public UDPServerClass () {// obtain the available IP address of the Local Machine IPAddress [] ips = Dns. getHostAddresses (Dns. getHostName (); foreach (IPAddress ipa in ips) {if (ipa. addressFamily = AddressFamily. interNetwork) {MyIPAddress = ipa; // obtain the local IP address break;} Note_StringBuilder = new StringBuilder (); PortName = 8080;} public UdpClient ReceiveUdpClient ;////// Listener port name ///Public int PortName ;////// Local address ///Public IPEndPoint LocalIPEndPoint ;////// Log records ///Public StringBuilder Note_StringBuilder ;////// Local IP address ///Public IPAddress MyIPAddress; public void Thread_Listen () {// create a Thread to receive the information sent from the remote host Thread myThread = new Thread (ReceiveData); myThread. isBackground = true; myThread. start ();}////// Receive data ///Private void ReceiveData () {IPEndPoint local = new IPEndPoint (MyIPAddress, PortName); ReceiveUdpClient = new UdpClient (local); IPEndPoint remote = new IPEndPoint (IPAddress. any, 0); while (true) {try {// when you close udpClient, this statement will generate an exception byte [] receiveBytes = ReceiveUdpClient. receive (ref remote); string receiveMessage = Encoding. default. getString (receiveBytes, 0, receiveBytes. length); // receiveMessage = ASCII Encoding. ASCII. getString (receiveBytes, 0, receiveBytes. length); MessageArrived (string. format ("{0} from {1 }:{ 2}", DateTime. now. toString (), remote, receiveMessage); // try // {// Byte [] sendBytes = Encoding. ASCII. getBytes ("Is anybody there? "); // ReceiveUdpClient. send (sendBytes, sendBytes. length, local); // catch (Exception e) // {//} // break;} catch {break ;}}}////// Add log information to Note_StringBuilder ///Public void AddMessage_Note_StringBuilder (){}}}

Simple interface code:

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace UdpChatExample{    public partial class UDPServerForm : Form    {        public UDPServerForm()        {            InitializeComponent();        }        public delegate void DelegateChangeText(string Messages);        void ChangeTxt(string Messages)        {            string SBText = SB.ToString();            SB.Remove(0, SB.Length);            SB.Append(Messages + "\r\n" + SBText);            richTextBox1.Text = SB.ToString();        }        StringBuilder SB = new StringBuilder();        private void UDPServerForm_Load(object sender, EventArgs e)        {        }        UDPServerClass UDPServerClass1;        private void button1_Click(object sender, EventArgs e)        {            UDPServerClass1 = new UDPServerClass();            UDPServerClass1.Thread_Listen();            UDPServerClass1.MessageArrived += new UDPServerClass.MessageHandler(UDPServerClass1_MessageArrived);        }        void UDPServerClass1_MessageArrived(string Message)        {            richTextBox1 .Invoke (new DelegateChangeText(ChangeTxt),Message);        }         private void UDPServerForm_FormClosing(object sender, FormClosingEventArgs e)        {            System.Environment.Exit(System.Environment.ExitCode);        }    }}