下列范例使用 UdpClient,在通讯端口11000传送UDP 资料包至多点传送位址群组 224.268.100.2。
它传送命令列上指定的信息字串。
using System; using System.Net; using System.Net.Sockets; using System.Text; public class UDPMulticastSender { private static IPAddress GroupAddress = IPAddress.Parse("224.168.100.2"); private static int GroupPort = 11000; private static void Send( String message) { UdpClient sender = new UdpClient(); IPEndPoint groupEP = new IPEndPoint(GroupAddress,GroupPort); try { Console.WriteLine("Sending datagram : {0}", message); byte[] bytes = Encoding.ASCII.GetBytes(message); sender.Send(bytes, bytes.Length, groupEP); sender.Close(); } catch (Exception e) { Console.WriteLine(e.ToString()); } } public static int Main(String[] args) { Send(args[0]); return 0; } }
using System; using System.Net; using System.Net.Sockets; using System.Text; public class UDPMulticastListener { private static readonly IPAddress GroupAddress = IPAddress.Parse("224.168.100.2"); private const int GroupPort = 11000; private static void StartListener() { bool done = false; UdpClient listener = new UdpClient(); IPEndPoint groupEP = new IPEndPoint(GroupAddress,GroupPort); try { listener.JoinMulticastGroup(GroupAddress); listener.Connect(groupEP); while (!done) { Console.WriteLine("Waiting for broadcast"); byte[] bytes = listener.Receive( ref groupEP); Console.WriteLine("Received broadcast from {0} :\n {1}\n", groupEP.ToString(), Encoding.ASCII.GetString(bytes,0,bytes.Length)); } listener.Close(); } catch (Exception e) { Console.WriteLine(e.ToString()); } } public static int Main(String[] args) { StartListener(); return 0; } }
本文提供了一个使用C#实现的UDP多点广播发送与接收的示例代码。该示例展示了如何通过UdpClient在指定端口11000上向多点广播地址224.168.100.2发送消息,并如何接收这些广播消息。
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