Unity使用UDP在局域网广播本地IP

使用Unity 在局域网中创建链接,更简便的方法获得服务器IP。  

想到的办法是通过服务器在局域网中广播本地IP地址：

    private static Socket sock;
    private static IPEndPoint iep1;
    private static byte[] data;
    private Thread t;

    public int udpPort = 9050;

    public void BroadcastIP()
    {
        sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

        iep1 = new IPEndPoint(IPAddress.Broadcast, udpPort);

        data = Encoding.ASCII.GetBytes("111");

        sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);

        t = new Thread(BroadcastMessage);
        t.Start();
    }

    private void BroadcastMessage()
    {
        while (true)
        {
            sock.SendTo(data, iep1);

            Thread.Sleep(2000);
        }
    }

在链接端，我们可以通过以下方法获取：

    byte[] data;
    string Error_Message;

    private Thread t;
    public int udpPort = 9050;

    void Awake()
    {
        GetSeverIP();
    }

    void GetSeverIP()
    {
        try
        {
            t = new Thread(Receive);
            t.Start();
        }
        catch (Exception e)
        {
            Debug.LogError("错误信息：" + e.Message);
        }
    }

    Socket sock;
    void Receive()
    {
        sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        IPEndPoint iep = new IPEndPoint(IPAddress.Any, udpPort);
        sock.Bind(iep);
        EndPoint ep = (EndPoint)iep;

        byte[] data = new byte[1024];
        int recv = sock.ReceiveFrom(data, ref ep);
        string stringData = Encoding.ASCII.GetString(data, 0, recv);

        Debug.Log(String.Format("received: {0} from: {1}", stringData, ep.ToString()));

        sock.Close();
    }

这样的话，变方便了很多。