Client

[mrithula8]

Hi, I have used the following code for the Tcp client server communication... When i run the Client.cs, it gives me an error stating: Error....at System.Net.Sockets.TcpClient.Connect..What changes should i do for the ipaddress and port..please help me with this...

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Diagnostics;
using System.Runtime;
using System.Text;

/// /// Summary description for Class1
///
public class Server
{
public Server()
{
//
// TODO: Add constructor logic here
//
}
public static void Main()
{

    try
    {
        IPAddress ipAd = IPAddress.Parse("192.168.1.32"); //use local m/c IP address, and use the same in the client
        TcpListener myList = new TcpListener(ipAd, 8006);

        myList.Start();

        Console.WriteLine("The server is running at port 8006...");
        
        Console.WriteLine("The local End point is  :" + myList.LocalEndpoint);
        Console.WriteLine("Waiting for a connection.....");

        Socket s = myList.AcceptSocket();
        Console.WriteLine("Connection accepted from " + s.RemoteEndPoint);

        byte\[\] b = new byte\[100\];
        int k = s.Receive(b);
        Console.WriteLine("Recieved...");
        for (int i = 0; i < k; i++)
            Console.Write(Convert.ToChar(b\[i\]));

        ASCIIEncoding asen = new ASCIIEncoding();
        s.Send(asen.GetBytes("The string was recieved by the server."));
        Console.WriteLine("\\\\nSent Acknowledgement");

        s.Close();
        myList.Stop();

    }

    catch (Exception e)
    {
        Console.WriteLine("Error..... " + e.StackTrace);
    }
}

}

[Rob Philpott]

Which line throws the exception - and what is the exception?

Regards, Rob Philpott.

[mrithula8]

Hi i am sorry i pasted the server code instead of the client in the previous post.. This is the code for the client the line

tcpclnt.Connect("192.168.0.2",8001);

gives me the error

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

public class clnt {

public static void Main() {
	
	try {
		TcpClient tcpclnt = new TcpClient();
		Console.WriteLine("Connecting.....");
		
		tcpclnt.Connect("192.168.0.2",8001); // use the ipaddress as in the server program
		
		Console.WriteLine("Connected");
		Console.Write("Enter the string to be transmitted : ");
		
		String str=Console.ReadLine();
		Stream stm = tcpclnt.GetStream();
					
		ASCIIEncoding asen= new ASCIIEncoding();
		byte\[\] ba=asen.GetBytes(str);
		Console.WriteLine("Transmitting.....");
		
		stm.Write(ba,0,ba.Length);
		
		byte\[\] bb=new byte\[100\];
		int k=stm.Read(bb,0,100);
		
		for (int i=0;i<k;i++)>
			Console.Write(Convert.ToChar(bb\[i\]));
		
		tcpclnt.Close();
	}
	
	catch (Exception e) {
		Console.WriteLine("Error..... " + e.StackTrace);
	}
}

}

[Greg Chelstowski]

I think the Connect method of TcpClient, or rather the overload you're using requires the Server's hostname, as opposed to its IP as a string. So try

tcpclnt.Connect("YourServerName",8006);

Worked for me ;> Or use a different overload of the Connect method. I need to investigate a bit further into that, cos this stuff is great!

var question = (_2b || !(_2b));

[mrithula8]

Hi how is that i can find the server's hostname?

[Greg Chelstowski]

OK. If you don't know the computer's name, try this:

byte[] zb = { 192, 168, 0, 5 }; //where 192.168.0.5 is the server's IP
System.Net.IPAddress ipa = new System.Net.IPAddress(zb);
System.Net.IPEndPoint Ipep = new System.Net.IPEndPoint(ipa, 8006);
TcpClient tcpCl = new TcpClient();
tcpCl.Connect(Ipep);

I just figured you would have known your server's name, that's all. But this works just as well (if not better). ;)

var question = (_2b || !(_2b));

[Mel Feik]

Perhaps you could post the actual exception. Often e.Source and e.Message are useful as well as the e.StackTrace. I have no problem using: myClient.Connect("xxx.xxx.xxx.xxx", port); in my current project. I'm using UdpClients but the overloads for .Connect are the same.

--------------------------------------------- Help... I'm embedded and I can't get out! If they don't get the basic research and learning skills down then they'll end up having a very hard life (Either that or they'll become managers) - Micheal P Butler