C # simple UDP Communication Example and code

1. UDP client

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;using System.Net.Sockets;using System.Net;namespace WindowsFormsApplication14{    public partial class Form1 : Form    {        UdpClient udpClient;        IPEndPoint ipEndPoint;        public Form1()        {            InitializeComponent();            udpClient = new UdpClient(12345);            ipEndPoint = new IPEndPoint(IPAddress.Parse("192.168.1.241"), 60000);        }        private void button1_Click(object sender, EventArgs e)        {            //byte[] mybyte = Encoding.Default.GetBytes("nihao");                        byte[] mybyte = new byte[4];            mybyte[0] = 0x12;            mybyte[1] = 0x00;            mybyte[2] = 0x34;            mybyte[3] = 0x00;                        udpClient.Send(mybyte, mybyte.Length,ipEndPoint);        }    }}

2. UDP Server

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;using System.Net.Sockets;using System.Net;namespace WindowsFormsApplication15{    public partial class Form1 : Form    {        UdpClient udpServer;        IPEndPoint ipEndPoint;        public Form1()        {            InitializeComponent();            udpServer = new UdpClient(23456);            ipEndPoint = new IPEndPoint(new IPAddress(0), 0);        }        private void button1_Click(object sender, EventArgs e)        {                        byte[] data = udpServer.Receive(ref ipEndPoint);            MessageBox.Show ( Encoding.Default.GetString(data));        }    }}

3. Number of current data in the read buffer

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; using System. net. sockets; using System. net; namespace WindowsFormsApplication15 {public partial class Form1: Form {UdpClient udpServer; IPEndPoint ipEndPoint; public Form1 () {InitializeComponent (); udpServer = new UdpClient (23456 ); ipEndPoint = new IPEndPoint (new IPAddress (0), 0);} private void button#click (object sender, EventArgs e) {byte [] outValue = BitConverter. getBytes (0); udpServer. client. IOControl (IOControlCode. dataToRead, null, outValue); MessageBox. show (BitConverter. toInt32 (outValue, 0 )). toString (); // when sending data, it is found that the data is growing, but not more than 8 K. // MessageBox. show (BitConverter. toString (outValue )). toString ());}}}

 

4. The above example is a little complicated. Let's look at the example below. This example also shows how to set up non-blocking Socket communication.

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; using System. net. sockets; using System. net; namespace WindowsFormsApplication15 {public partial class Form1: Form {UdpClient udpServer; IPEndPoint ipEndPoint; public Form1 () {InitializeComponent (); udpServer = new UdpClient (23456 ); ipEndPoint = new IPEndPoint (new IPAddress (0), 0); udpServer. client. blocking = false; // set to non-Blocking mode} private void button#click (object sender, EventArgs e ){