无法在C＃中连接2台计算机

Question

I am trying to send a message between 2 computers. I have been able to establish connection but for some weird reason i have been unable to acquire stream.

Server Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.IO;

namespace chat_server
{
 class Program
 {
    static void Main(string[] args)
    {
        TcpListener server = new TcpListener(IPAddress.Any, 9999);
        server.Start();

        Console.WriteLine("Waiting for client connections");
        TcpClient client = server.AcceptTcpClient();
        Console.WriteLine("Client request accepted");

        NetworkStream stream = client.GetStream();
        StreamReader reader = new StreamReader(stream);
        StreamWriter writer = new StreamWriter(stream);

        Console.WriteLine("The message is " + reader.ReadToEnd());
    }
 }
}

Client Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.IO;

namespace chat_client
{
 class Program
 {
    static void Main(string[] args)
    {
        TcpClient client = new TcpClient("localhost", 9999);

        NetworkStream stream = client.GetStream();
        StreamReader reader = new StreamReader(stream);
        StreamWriter writer = new StreamWriter(stream);

        writer.Write("Hello world");
        Console.WriteLine("Message Sent");
        Console.ReadKey();
    }
 }
}

My server code confirms client connection by printing client request accepted. However for some reason i am unable to acquire data from stream. Quick Help would be really appreciated.

Thank you

Answer 1

You need to flush the stream in order to actually send the data.

Try:

writer.Write("Hello world");
writer.Flush();

Take a look at the MSDN docs for more information:

Synchronous socket server: http://msdn.microsoft.com/en-us/library/6y0e13d3.aspx Asynchronous socket server: http://msdn.microsoft.com/en-us/library/5w7b7x5f.aspx

Here's a site that explains in more detail the ins and outs of sockets: http://nitoprograms.blogspot.co.uk/2009/04/tcpip-net-sockets-faq.html

Answer 2

In server side,

add static TcpListener server; at the top

Then `server.Start();

        Socket soc = listener.AcceptSocket();

        Console.WriteLine("Connection successful");
        Stream s = new NetworkStream(soc);

        StreamReader reader = new StreamReader(s);
        StreamWriter writer= new StreamWriter(s);

        sw.AutoFlush = true;
        sw.WriteLine("hello world");`

In client side

 TcpClient client = new TcpClient("localhost", 9999);
        Stream s = client.GetStream();
        Console.WriteLine("Connection successfully received");

        StreamWriter writer = new StreamWriter(s);
        StreamReader reader = new StreamReader(s);
        sw.AutoFlush = true;
        string dis=reader.readLine();
        Console.WriteLine(dis); 

Hope it will work now.