使用UdpClient收听UPnP广播

问题描述

限时删除！！

仅尝试从本地网络中的设备接收UPnP广播。我确实找到了很多类似的问题，并尝试了很多建议，但没有一个主题能成功。我确实用Wireshark看到了UDP数据包，因此实际上是在我的计算机上收到的。有什么建议？

Just trying to receive a UPnP broadcast from a device in my local network. I did find a lot of similar questions and tried a bunch of suggestions, none of theme where successful. I do see the UDP packets with Wireshark, so they are actually received on my computer. Any suggestions?

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class UDPListener
{
    private const int listenPort = 1900;

    private static void StartListener()
    {
        bool done = false;

        IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Any, listenPort);

        UdpClient listener = new UdpClient();
        listener.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
        listener.Client.Bind(localEndPoint);
        listener.JoinMulticastGroup(IPAddress.Parse("239.255.255.250"));
        listener.MulticastLoopback = true;

        IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, 0);

        try
        {
            while (!done)
            {
                Console.WriteLine("Waiting for broadcast");
                var bytes = listener.Receive(ref groupEP);

                Console.WriteLine("Received broadcast from {0} :\n {1}\n",
                   groupEP.ToString(),
                   Encoding.ASCII.GetString(bytes, 0, bytes.Length));

            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.ToString());
        }
        finally
        {
            listener.Close();
        }
    }

    public static int Main()
    {
        StartListener();

        return 0;
    }
}

推荐答案

感谢尝试错误我通过绑定到多播组时指定本地地址来使其正常工作。我在示例中对地址进行了硬编码，因为它只是一个沙盒应用程序。使用 IPAddress.Any 不起作用。我不知道为什么供将来参考，以及其他可能会寻找类似东西的可怜人：

Thanks to Try and Error I did got it working by specifying my local address while binding to the multicast group. I hardcoded the address in the example since It's is just a sandbox application. Using IPAddress.Any does not work. I don't know exactly why. For future reference and other poor souls who might looking for similar stuff:

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class UDPListener
{
    private static void StartListener()
    {
        bool done = false;

        IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Any, 1900);

        UdpClient listener = new UdpClient();
        listener.Client.Bind(localEndPoint);
        listener.JoinMulticastGroup(IPAddress.Parse("239.255.255.250"), IPAddress.Parse("10.32.4.129"));

        IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, 0);

        try
        {
            while (!done)
            {
                Console.WriteLine("Waiting for broadcast");
                var bytes = listener.Receive(ref groupEP);

                Console.WriteLine("Received broadcast from {0} :\n {1}\n",
                   groupEP.ToString(),
                   Encoding.ASCII.GetString(bytes, 0, bytes.Length));
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.ToString());
        }
        finally
        {
            listener.Close();
        }
    }

    public static int Main()
    {
        StartListener();

        return 0;
    }
}

这篇关于使用UdpClient收听UPnP广播的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

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