Question

感谢您对此问题的任何帮助/反馈。我正在用C＃开发一个异步套接字连接，我想设置一个广播客户端接收器，使它广播本地网络服务器，然后它从本地服务器接收消息。主要问题是首先我想从一个客户端广播到不同的服务器，然后从所有服务器检索IP地址。这是客户端代码的一部分。服务器端工作正常。

public void ButtonConnectOnClick()
    {
        // Init socket Client
        newsock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        newsock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);
        IPAddress ipAddress = IPAddress.Broadcast;  //Parse(txtServerIP.Text);
        IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, BROADCASTPORT);
        epServer = (EndPoint)ipEndPoint;
        string tmp = "hello";
        byteData = Encoding.ASCII.GetBytes(tmp);
        newsock.BeginSendTo(byteData, 0, byteData.Length, SocketFlags.None, epServer, new AsyncCallback(OnSend), null);
        byteData = new byte[1024];
        newsock.BeginReceiveFrom(byteData, 0, byteData.Length, SocketFlags.None, ref epServer, new AsyncCallback(OnReceive), null);
    }

    private void OnSend(IAsyncResult ar)
    {
        try
        {
            newsock.EndSend(ar);
        }
        catch (ObjectDisposedException)
        { }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, null, MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }

    private void OnReceive(IAsyncResult ar)
    {
        try
        {
            newsock.EndReceive(ar);              

            byteData = new byte[1024];

            //Start listening to receive more data from the user
            newsock.BeginReceiveFrom(byteData, 0, byteData.Length, SocketFlags.None, ref epServer, new AsyncCallback(OnReceive), null);
        }
        catch (ObjectDisposedException)
        { }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, null, MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }

Answer 1

一种选择是使用现有的服务发现项目。 ZeroConf是一个完整的.NET实现，基于Apple的Bounjour。利用此框架，您可以启动应用程序并查询所有可用服务及其IP地址。

代码是project documentation的直接副本，但已过帐以显示易用性。

发现（客户端）

    static void Main(string[] args)
    {
        BonjourServiceResolver bsr = new BonjourServiceResolver();
        bsr.ServiceFound += new Network.ZeroConf.ObjectEvent<Network.ZeroConf.IService>(bsr_ServiceFound);
        bsr.Resolve("_daap._tcp");
        Console.ReadLine();
    }

    static void bsr_ServiceFound(Network.ZeroConf.IService item)
    {
        // Here goes the code for what you want to do when a service is discovered
        Console.WriteLine(item);
    }

发布（服务器端）

Service s = new Service();
s.AddAddress(ResolverHelper.GetEndPoint());
s.Protocol = "_touch-able._tcp.local.";
s.Name = "MyName";
s.HostName = s.Addresses[0].DomainName;

//The indexer on the service enables to set metadatas
s["DvNm"] = "PC Remote";
s["RemV"] = "10000";
s["DvTy"] = "iPod";
s["RemN"] = "Remote";
s["txtvers"] = "1";
s["Pair"] = "0000000000000001";

//After setting all this, the only thing left to do is to publish your service
s.Publish();
Thread.Sleep(3600000);
s.Stop();

异步客户端广播接收器

1 个答案: