C#UDP的多路广播组的发送和接收

来源：互联网发布：网络直播主播作用编辑：程序博客网时间：2024/06/15 17:07

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。

[C#]
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;
}
}

下列范例使用 UdpClient，在通讯端口 11000 监听广播到多点传送位址群组 224.168.100.2 的 UDP 资料包。它接收信息字串，并將信息写入主控台 (Console)。

[C#]
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;
}
}