socket programming in C#

Question

0.00/5 (No votes)

See more:

How many clients can connect to this server? How do I change the server code?

C#

private void btnserverconect_Click(object sender, EventArgs e)
{
    Form1_Load(sender, e);
}

private void Form1_Load(object sender, EventArgs e)
{
    try {
        server =
            new Socket(AddressFamily.InterNetwork, SocketType.Stream,
                   ProtocolType.Tcp);

        //IPAddress local = IPAddress.Parse("127.0.0.1");
        EndPoint destination = new IPEndPoint(IPAddress.Any, 8000);
        server.Bind(destination);
        server.Listen(5);
        Thread wait = new Thread(wa);
        wait.Start();
    }
    catch(Exception) 
    {
        MessageBox.Show("connection error !");
    }
}

void wa()
{
    label1.Text = "please wait...";
    server = server.Accept();
    label1.Text = "connect";
    while (true) {
        try 
       {
            byte[]by = new byte[100];
            int n = server.Receive(by);
            lstserver.Items.Add("client :" +
                        Encoding.ASCII.GetString(by, 0, n));
        }
        catch(Exception) 
        {
        }
    }
}

Posted 28-Dec-11 13:32pm

uness_126

Updated 28-Dec-11 14:19pm

v3

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2011-12-28T15:02:00

On the same port, you can connect unlimited number of clients to each listening socket of instance of System.Net.Sockets.TcpListener (limited by factors like available memory and the like). In this case, on each socket or TcpClient accepted by the server side, the server side obtains an instance of socket or TcpClient representing remote socket of the connected client. These instances can be used by a server side to send/recieve or write/read to/from the network stream (in case if TcpListener).

I don't know how to change your code just because I don't know your goal. However, the code you've shown does not look like having full sense. First of all, this is because you are not using threads. A server side needs two additional thread as minimum: one to accept new connections, another one to send/receive socket data or write/read to/from the network streams.

If you are trying to perform any blocking calls in your UI, consider you are done — it can never work properly.

Not clear why do you want to use Forms application for the server side. The adequate form of server-side application is a Windows Service. However, if you want to use the Form application for introductory experiments, research and/or prototyping, it's perfectly fine.

You can find some ideas I shared on this topic in my past solution:
Multple clients from same port Number[^].

For threads working with UI (which is more typically developed on the client side), you need to use UI thread invocation. Please see:
Control.Invoke() vs. Control.BeginInvoke()[^],
Problem with Treeview Scanner And MD5[^].

For more on threading, please see my collection of my past solutions:

How to get a keydown event to operate on a different thread in vb.net[^],
Control events not firing after enable disable + multithreading[^].

—SA