Question

我正在使用system.Net.Socket从服务器向客户端发送和接收消息。但是当多个服务器广播消息然后接收器程序突然关闭时，我正面临问题。

我的广播服务器代码如下..

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

public class Broadcst
{
    public static void Main()
    {
        Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        IPEndPoint iep1 = new IPEndPoint(IPAddress.Broadcast, 9050);
        IPEndPoint iep2 = new IPEndPoint(IPAddress.Parse("192.168.1.255"), 9050);

        string hostname = Dns.GetHostName();
        byte[] data = Encoding.ASCII.GetBytes(hostname);

        sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);
        sock.SendTo(data, iep1);
        sock.SendTo(data, iep2);
        sock.Close();
    }
}

客户的我的接收者代码如下......

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

    public class RecvBroadcst
    {
        public static void Main()
        {
            Socket sock = new Socket(AddressFamily.InterNetwork,
                            SocketType.Dgram, ProtocolType.Udp);

While(true){
  IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9050);
            sock.Bind(iep);
            EndPoint ep = (EndPoint)iep;
            Console.WriteLine("Ready to receive...");

            byte[] data = new byte[1024];
            int recv = sock.ReceiveFrom(data, ref ep);
            string stringData = Encoding.ASCII.GetString(data, 0, recv);
            Console.WriteLine("received: {0}  from: {1}",
                                  stringData, ep.ToString());

            data = new byte[1024];
            recv = sock.ReceiveFrom(data, ref ep);
            stringData = Encoding.ASCII.GetString(data, 0, recv);
            Console.WriteLine("received: {0}  from: {1}",
                                  stringData, ep.ToString());

}
            sock.Close();
        }
    }

那么当有多个服务器广播时，客户端如何收到多个广播消息？

当我再次从服务器发送消息时，其抛出错误如“通常只允许使用每个套接字地址（协议/网络地址/端口）”

Answer 1

您在同一个Socket实例上调用Bind多次使用相同的参数（每次迭代一次）。您应该拨打Bind一次。

Answer 2

我解决了上面代码中的更改与接收方side.i只是绑定套接字的问题每次因此我现在只绑定它一次并且每次只从指定端口迭代传入数据。

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

public class RecvBroadcst
{
    public static void Main()
    {
       Socket sock = new Socket(AddressFamily.InterNetwork,
                           SocketType.Dgram, ProtocolType.Udp);
     //  int port_no=Convert.ToInt32(sock.RemoteEndPoint);


         int portnumber = 9050;

            sock = new Socket(AddressFamily.InterNetwork,
                           SocketType.Dgram, ProtocolType.Udp);
            IPEndPoint iep = new IPEndPoint(IPAddress.Any,portnumber);
            sock.Bind(iep);
            EndPoint ep = (EndPoint)iep;
            Console.WriteLine("Ready to receive...");
          // int port_no = Convert.ToInt32(sock.RemoteEndPoint);
            while (true)
            {

                byte[] data = new byte[1024];
                int recv = sock.ReceiveFrom(data, ref ep);
                string stringData = Encoding.ASCII.GetString(data, 0, recv);
                Console.WriteLine("received: {0}  from: {1}",
                                      stringData, ep.ToString());

                //data = new byte[1024];
                //recv = sock.ReceiveFrom(data, ref ep);
                //stringData = Encoding.ASCII.GetString(data, 0, recv);
                //Console.WriteLine("received: {0}  from: {1}",
                //                      stringData, ep.ToString());

                data = null;
            }
            //portnumber--;


        sock.Close();
    }
}

我刚刚成功了......谢谢你的回复。这有很大的帮助。

当有多个服务器广播时，客户端如何接收多个广播消息？

2 个答案: