Socket Programming (Handing mulitple connections help)

This is a discussion on Socket Programming (Handing mulitple connections help) within the C# Programming forums, part of the General Programming Boards category; I have created a simple basic program that uses sockets but it can only handle one connection, how do I ...

  1. #1
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    Socket Programming (Handing mulitple connections help)

    I have created a simple basic program that uses sockets but it can only handle one connection, how do I make it so it handles multiple connections?

    Server code:
    Code:
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Net.Sockets;
    using System.Net;
    namespace ConsoleApplication2
    {
        class Program
        {
            static void Main(string[] args)
            {
                string input = "";
                string message;
                byte[] buffer=new byte[250];
                IPHostEntry local = Dns.GetHostByName(Dns.GetHostName());
                IPEndPoint iep = new IPEndPoint(local.AddressList[0],8000);
                Socket newServer = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                newServer.Bind(iep);
                newServer.Listen(10);
                Socket newClient = newServer.Accept();
    
    
    
                if (newClient.Connected)
                {
                    newClient.Receive(buffer);
                    message = Encoding.ASCII.GetString(buffer);
                    Console.WriteLine(message);
                    newClient.Send(Encoding.ASCII.GetBytes("Hello client"));
    
                }
                
    
    
    
                newClient.Close();
    
               
            }
        }
    }


    client code:

    Code:
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Net.Sockets;
    using System.Net;
    
    namespace ConsoleApplication3
    {
        class Program
        {
            static void Main(string[] args)
            {
                int number=1;
                string messageClient;
                byte[] bufferClient=new byte[200];
                IPAddress ip = IPAddress.Parse("192.168.30.127");
                IPEndPoint ie = new IPEndPoint(ip, 8000);
                Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                client.Connect(ie);
                
                    if (client.Connected)
                    {
                        client.Send(Encoding.ASCII.GetBytes("hello server"));
                        client.Receive(bufferClient);
                        messageClient = Encoding.ASCII.GetString(bufferClient);
                        Console.WriteLine(messageClient);
                    }
                
               
    
                client.Close();
               
            }
        }
    }

  2. #2
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    you need to put your call to accept() inside a while loop, and spawn a thread for each new connection that you receive.

  3. #3
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    Quote Originally Posted by Elkvis View Post
    you need to put your call to accept() inside a while loop, and spawn a thread for each new connection that you receive.

    ahh okay thanks, what do you mean by thread though, if i wanted to keep track of each single connection could i put them in a dictionary or list of sockets?

  4. #4
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    Quote Originally Posted by shivam1992 View Post
    ahh okay thanks, what do you mean by thread though
    a thread is a lightweight process. look at the System.Threading.Thread class.

    Quote Originally Posted by shivam1992 View Post
    if i wanted to keep track of each single connection could i put them in a dictionary or list of sockets?
    you certainly could, but if you're using threads as I suggest, make sure to follow good thread safety practices, so that only one thread tries to access the collection of sockets at once.

  5. #5
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    If you're intending to have many clients connecting to your server at the same time I recommend you avoid "thread per client" as it will end up slowing your computer down. Instead you could consider a non-blocking solution which would forego the need for additional threads at all.

  6. #6
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    a single-threaded non-blocking model may be better for performance on the server machine, but the perceived performance by the clients could be much much worse. if two clients try to make a request at the same time, one will have to wait for the other while it finishes this could be unpleasant for the clients on long-running requests. one possible solution for this is to spawn a thread for each request, but monitor the raw sockets with a polling loop.

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