C# Simple Socket Programming In Console - 간단한 콘솔 소켓 통신

콘솔에서 간단한 메세지를 주고 받는 서버, 클라이언트를 만들어 보자.

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
using System.Net;
using System.Net.Sockets;
 
namespace Server
{
    class Program
    {
        static void Main(string[] args)
        {
            IPEndPoint serverEndPoint = new IPEndPoint(IPAddress.Parse("192.168.0.100"), 7777);
            Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
 
            Console.WriteLine("■ Server Info:");
            Console.WriteLine("IP Address : {0}", serverEndPoint.Address);
            Console.WriteLine("Port Number: {0}", serverEndPoint.Port);
            Console.WriteLine("AddressFamily : {0}", serverEndPoint.AddressFamily);
 
            // Associates a Socket with a local endpoint.
            server.Bind(serverEndPoint);
 
            // Places a Socket in a listening state.
            // Parameter: The maximum length of the pending connections queue.
            server.Listen(5);
 
            Console.WriteLine("Waiting for a client...");
 
            // Creates a new Socket for a newly created connection.
            Socket client = server.Accept();
 
            IPEndPoint clientEndPoint = (IPEndPoint)client.RemoteEndPoint;
            Console.WriteLine("Client connected: {0}", clientEndPoint.Address);
 
            byte[] sendBuff = Encoding.UTF8.GetBytes("Connected to the server.");
            // Sends the specified number of bytes of data to a connected Socket, using the specified SocketFlags.
            client.Send(sendBuff, sendBuff.Length, SocketFlags.None);
 
            byte[] recvBuff = new byte[256];
            // Receives data from a bound Socket into a receive buffer.
            // Return: The number of bytes received.
            if (client.Receive(recvBuff) != 0)
            {
                Console.WriteLine("Message from a client: " + Encoding.UTF8.GetString(recvBuff));
            } else
            {
                Console.WriteLine("No message.");
            }
 
            // Closes the Socket connection and releases all associated resources.
            client.Close();
            server.Close();
        }
    }
}

 

서버 소스

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
using System.Net;
using System.Net.Sockets;
 
namespace Client
{
    class Program
    {
        static void Main(string[] args)
        {
            IPEndPoint serverEndPoint = new IPEndPoint(IPAddress.Parse("192.168.0.100"), 7777);
            Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
 
            // Establishes a connection to a remote host.
            client.Connect(serverEndPoint);
            Console.WriteLine("Connecting to the server...");
 
            byte[] recvBuff = new byte[256];
            client.Receive(recvBuff);
            Console.WriteLine("Message from the server: " + Encoding.UTF8.GetString(recvBuff));
 
            client.Send(Encoding.UTF8.GetBytes("Hello."));
 
            client.Close();
        }
    }
}

 

클라이언트 소스

 

서버를 실행 시키면 클라이언트를 기다린다.

 

클라이언트를 실행 시키면 대기중인 서버와 연결되고 메세지를 주고 받는다.

 

서버에도 클라이언트로부터 받은 메세지가 표시된다.