使用UdpClient收听UPnP广播

本文介绍了使用UdpClient收听UPnP广播的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

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; } }