C# Networking Problem

Question

C# networking problem
Posted: 02-12-2009 11:04 AM

I'm working on a crude C# console chat application. I'm doing it to learn more about both networking and C#. So far the program works, and both the server and client are able to communicate with one another. The program works by having both the server and the client create a username, and then each waits for the other to communicate a message before being able to type in a response. My problem is that I want the server to display the message "(client's name) has connected" where (client's name) contains the actual username of the client. I try to achieve this by having the client write the name to the server, but when I implement the code, both the client and server are unresponsive. To see what I mean, run the following two programs, but uncomment the code under the sections "IS THIS LINE WRITING" and "THIS LINE DOESN'T WORK". Its a very simple application so I'm probably just missing something. Any help is greatly appreciated.

Client Code:

[CODE]
using System;
using System.Collections.Generic;
using System.Text;

namespace BasicClientApp
{
using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

public class BasicClientApp
{
static public void Main(string[] Args)
{


Console.WriteLine("Welcome to tugboat talk");
Console.WriteLine("Please enter your user name");
String clientName = Console.ReadLine();
Console.WriteLine("Connecting to Server...");
TcpClient theServer;
NetworkStream networkStream;
System.IO.StreamReader streamReader;
System.IO.StreamWriter streamWriter;

try
{
theServer = new TcpClient();
//this is connecting to the server located at the following email address
//the server should be listening on port 13000

//insert your ip address here
theServer.Connect("144.249.58.10", 13000);

networkStream = theServer.GetStream();
streamReader =
new System.IO.StreamReader(networkStream);
streamWriter =
new System.IO.StreamWriter(networkStream);
Console.WriteLine("Connected to Server. Wait for message");


//******************* IS THIS LINE WRITING??? ******************************8
//streamWriter.Write(clientName);
//streamWriter.Flush();


// **********************************************************************

}
catch
{
Console.WriteLine(
"Failed to connect to the server", "localhost");
Console.ReadKey();
return;
}



try
{
string outputString = "";
string inputString = "";


try
{
// streamWriter.WriteLine(clientName);
}
catch
{
Console.WriteLine("Client name could not be written");
Console.ReadKey();
}


while(inputString != "quit")// read the data from the host and display it
{

outputString = streamReader.ReadLine();
Console.WriteLine(outputString);
inputString = Console.ReadLine();
if (inputString == "quit")
break;
streamWriter.WriteLine(clientName + ": " + inputString);
//Console.WriteLine(inputString);
streamWriter.Flush();
}
}
catch
{
Console.WriteLine("Client exited the program");
}
// tidy up
Console.WriteLine("You are about to exit Tugboat Talk");
Console.ReadKey();
networkStream.Close();
}
}
}
[/CODE]






====================================
Server Application:

[CODE]

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



public class BasicServerApp
{
public static void Main()
{
Int32 port = 13000;
String userName;
//insert your IP address here
IPAddress localAddr = IPAddress.Parse("144.249.58.10");
Console.WriteLine("Tugboat Talk is starting now");
Console.WriteLine("Enter your user name ");
userName = Console.ReadLine();
TcpListener tcpListener = new TcpListener(localAddr, port);
tcpListener.Start();
Console.WriteLine("Waiting for a client connection...");
TcpClient client = tcpListener.AcceptTcpClient();
NetworkStream networkStream;
System.IO.StreamWriter streamWriter;
System.IO.StreamReader streamReader;

try{

networkStream = client.GetStream();
streamWriter =
new System.IO.StreamWriter(networkStream);
streamReader =
new System.IO.StreamReader(networkStream);
}
catch
{
Console.WriteLine("Error opening stream. Closing application.");
return;
}


if (client.Connected)
{
Console.WriteLine("A client has connected. Please type a message");

}
string theString;

//************************ THIS LINE DOESN't WORK!!!!! *****************************

//Console.WriteLine(streamReader.ReadLine() + " has connected");


//**********************************************************************************

while (client.Connected)
{

try
{

theString = Console.ReadLine();
streamWriter.WriteLine(userName + ": " + theString);
//Console.WriteLine(theString);
streamWriter.Flush();
theString = streamReader.ReadLine();
Console.WriteLine(theString);
}
catch
{
Console.WriteLine("The client disconnected.");
break;

}


}

streamReader.Close();
networkStream.Close();
streamWriter.Close();
client.Close();
Console.WriteLine("Exiting...");
Console.ReadKey();
}
}

[/CODE]