프로그램 설명
msdn 사이트에 있는 예제를 조금 수정해서 작성했습니다.
원본 소스는 아래와 같습니다.
비동기 서버 예제 : http://msdn.microsoft.com/ko-kr/library/bew39x2a(v=vs.110).aspx
비동기 클라이언트 예제 : http://msdn.microsoft.com/ko-kr/library/fx6588te(v=vs.110).aspx
비동기로 소켓을 실행하기 위해 ManualResetEvent 클래스를 사용해서 thread 간 통신을 하며, StateObject class 를 만들어서 받을 데이타를 정의하는 부분이 추가 되었으며, 비동기 호출 method 들(beginAccept, beginReceive, beginSend)을 호출합니다.
다른 부분들은 동기 서버/클라이언트의 추가 함수들을 같이 사용했습니다.(문자열 자르기, 로컬 아이피 가져오기)
초기에 실행하면 다른점이 보이는데 이 부분이 실제로 비동기 호출을 담당하는 부분이며 소켓을 통해서 데이타를 주고 받는 부분이 비동기로 구현되어 있습니다.
실행 후
메시지 전송 후
프로그램 작성 순서
1. 소켓/쓰레드과 관련한 네임스페이스를 서버/클라이언트 모두에 포함 시킵니다.
using System.Net;
using System.Net.Sockets;
using System.Threading;
2. 서버 프로그램
// State object for reading client data asynchronously
public class StateObject
{
// Client socket
public Socket workSocket = null;
// Size of receive buffer
public const int BufferSize = 1024;
// Receive buffer
public byte[] buffer = new byte[BufferSize];
// Received data string
public StringBuilder sb = new StringBuilder();
}
class Program
{
// Thread signal
public static ManualResetEvent allDone = new ManualResetEvent(false);
public static string TruncateLeft(string value, int maxLength)
{
if (string.IsNullOrEmpty(value)) return value;
return value.Length <= maxLength ? value : value.Substring(0, maxLength);
}
// Get local IP
public static string LocalIPAddress()
{
IPHostEntry host;
string localIP = "";
host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
localIP = ip.ToString();
return localIP;
}
}
return "127.0.0.1";
}
private static void StartListening()
{
// Data buffer for incoming data
byte[] bytes = new byte[1024];
// Establish the local endpoint for the socket
// running the listener is "192.168.0.12" 테스트 아이치
IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Parse(LocalIPAddress()), 11000);
// Create a TCP/IP socket
Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
// Bind the socket to the local endpoint and listen for incoming connecions.
try
{
listener.Bind(localEndPoint);
listener.Listen(100);
while(true)
{
// Set the event to nonsignaled state
allDone.Reset();
// Start an asynchronous socket to listen for connections.
Console.WriteLine("\nWaiting for a connections...");
listener.BeginAccept(new AsyncCallback(AcceptCallback) , listener);
// Wait until a connection is made before running
allDone.WaitOne();
}
}
catch (SocketException se)
{
Console.WriteLine("StartListening[SocketException] Error : {0} ", se.Message.ToString());
}
catch (Exception ex)
{
Console.WriteLine("StartListening[Exception] Error : {0} ", ex.Message.ToString());
}
Console.WriteLine("\nPress ENTER to continue.....\n");
Console.ReadLine();
}
public static void AcceptCallback(IAsyncResult ar)
{
// Signal the main thread to continue.
allDone.Set();
// Get the socket that handles the client socket
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);
// Create the socket object
StateObject state = new StateObject();
state.workSocket = handler;
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);
}
public static void ReadCallback(IAsyncResult ar)
{
string content = string.Empty;
// Retrieve the state object and the handler socket
// from the asynchronous state object
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;
// Read data from the client socket
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
// There might be more data, so store the data received so far
state.sb.Append(Encoding.UTF8.GetString(state.buffer, 0, bytesRead));
// Check for end-of-file tag. If it it not there, read more data
content = state.sb.ToString();
if (content.IndexOf("<eof>") > -1)
{
// All the data has been read from the
// client. DIsplay it on the console.
content = TruncateLeft(content, content.Length - 5);
Console.WriteLine("Read {0} bytes from socket \nData : {1}", content.Length, content);
// Echo the data back to the client
Send(handler, content);
}
else
{
// Not all data received. Get more
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0 , new AsyncCallback(ReadCallback), state);
}
}
}
private static void Send(Socket handler, string data)
{
// Convert the string data to bytes data using UTF8 encoding
byte[] byteData = Encoding.UTF8.GetBytes(data);
// Being sending the data to the remote device
handler.BeginSend(byteData, 0, byteData.Length, 0, new AsyncCallback(SendCallback) , handler);
}
private static void SendCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object
Socket handler = ar.AsyncState as Socket;
// Complete sending the data to the remote device
int bytesSent = handler.EndSend(ar);
Console.WriteLine("Sent {0} bytes to client.", bytesSent);
handler.Shutdown(SocketShutdown.Both);
handler.Close();
}
catch (SocketException se)
{
Console.WriteLine("SendCallback[SocketException] Error : {0} ", se.Message.ToString());
}
catch (Exception ex)
{
Console.WriteLine("SendCallback[Exception] Error : {0} ", ex.Message.ToString());
}
}
static void Main(string[] args)
{
StartListening();
}
}
3. 클라이언트 프로그램
#region State object define
// State object for receiving data from reomte device
public class StateObject
{
// Client socket
public Socket workSocket = null;
// Size of receive buffer
public const int BufferSize = 256;
// Receive buffer
public byte[] buffer = new byte[BufferSize];
// Received data string
public StringBuilder sb = new StringBuilder();
}
#endregion
class Program
{
// The port number for the remote device
private const int port = 11000;
// ManaulResetEvent instances signal completion
private static ManualResetEvent connectDone = new ManualResetEvent(false);
private static ManualResetEvent sendDone = new ManualResetEvent(false);
private static ManualResetEvent receiveDone = new ManualResetEvent(false);
// The response from the remote device
private static String response = String.Empty;
private static void StartClient()
{
// Connect to a remote device
try
{
// Establish the remote endpoint for the socket
// The name of
// remote device 아이피 "192.168.0.12" : 테스트 목적
IPEndPoint remoteEP = new IPEndPoint(IPAddress.Parse("192.168.0.12"), port);
// Create a TCP/IP socket
Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
// Connect to the remote endpoint
client.BeginConnect(remoteEP, new AsyncCallback(ConnectCallback), client);
connectDone.WaitOne();
// Send user input data to the remote device
Console.Write("전송할 메시지를 입력해 주세요 : ");
string sendData = Console.ReadLine() + "<eof>";
Send(client, sendData);
sendDone.WaitOne();
// Receive the response from the remote device.
Receive(client);
receiveDone.WaitOne();
// Write the response to the console
Console.WriteLine("Response received : {0}", response);
// Release the socket
client.Shutdown(SocketShutdown.Both);
client.Close();
}
catch (SocketException se)
{
Console.WriteLine("StartClient SocketException Error : {0} ", se.Message.ToString());
}
catch (Exception ex)
{
Console.WriteLine("StartClient Exception Error : {0} ", ex.Message.ToString());
}
}
private static void ConnectCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object
Socket client = (Socket)ar.AsyncState;
// Complete the connection
client.EndConnect(ar);
Console.WriteLine("Socket connected to {0}", client.RemoteEndPoint.ToString());
// Signal that the connection has been made
connectDone.Set();
}
catch (SocketException se)
{
Console.WriteLine("ConnectCallback SocketException Error : {0} ", se.Message.ToString());
}
catch(Exception ex)
{
Console.WriteLine("ConnectCallback Exception Error : {0} ", ex.Message.ToString());
}
}
private static void Receive(Socket client)
{
try
{
// Create the state object
StateObject state = new StateObject();
state.workSocket = client;
// Begin receiving the data from the remote device
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReceiveCallback), state);
}
catch (SocketException se)
{
Console.WriteLine("Receive SocketException Error : {0} ", se.Message.ToString());
}
catch (Exception ex)
{
Console.WriteLine("Receive Exception Error : {0} ", ex.Message.ToString());
}
}
private static void ReceiveCallback(IAsyncResult ar)
{
try
{
// Retrieve the state object and the client socket
// from the asynchronous state object
StateObject state = (StateObject)ar.AsyncState;
Socket client = state.workSocket;
// Read data from the remote device
int bytesRead = client.EndReceive(ar);
if (bytesRead > 0)
{
// There might be more data, so store the data received so far
state.sb.Append(Encoding.UTF8.GetString(state.buffer, 0, bytesRead));
// Get the rest of the data
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReceiveCallback), state);
}
else
{
// All the data has arrived; put it in response
if (state.sb.Length > 1)
response = state.sb.ToString();
// Signal that all bytes have been received.
receiveDone.Set();
}
}
catch (SocketException se)
{
Console.WriteLine("ReceiveCallback SocketException Error : {0} ", se.Message.ToString());
}
catch (Exception ex)
{
Console.WriteLine("ReceiveCallback Exception Error : {0} ", ex.Message.ToString());
}
}
private static void Send(Socket client, string data)
{
// Convert the string data to byte data using UTF8 encoding
byte[] byteData = Encoding.UTF8.GetBytes(data);
// Being sending the data to the remote device
client.BeginSend(byteData, 0, byteData.Length, SocketFlags.None, new AsyncCallback(SendCallback), client);
}
private static void SendCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object
Socket client = ar.AsyncState as Socket;
// Complete sending the data to the remote device
int bytesSent = client.EndSend(ar);
Console.WriteLine("Sent {0} bytes to server", bytesSent);
// Signal that all bytes have been sent
sendDone.Set();
}
catch (SocketException se)
{
Console.WriteLine("SendCallback SocketException Error : {0} ", se.Message.ToString());
}
catch (Exception ex)
{
Console.WriteLine("SendCallback Exception Error : {0} ", ex.Message.ToString());
}
}
static void Main(string[] args)
{
StartClient();
Console.ReadLine();
}
}
LogFile.cs
