[C#]
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
public class SynchronousSocketClient {public static void StartClient() {// Data buffer for incoming data.
byte[] bytes = new byte[1024];
// Connect to a remote device.
try {// Establish the remote endpoint for the socket.
//The name of the
// remote device is "host.contoso.com".
IPHostEntry ipHostInfo = Dns.Resolve("host.contoso.com");IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint remoteEP = new IPEndPoint(ipAddress,11000);
// Create a TCP/IPsocket.
Socket sender = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp );
// Connect the socket to the remote endpoint. Catch any errors.
try {sender.Connect(remoteEP);
Console.WriteLine("Socket connected to {0}",sender.RemoteEndPoint.ToString());
// Encode the data string into a byte array.
byte[] msg = Encoding.ASCII.GetBytes("This is a test<EOF>");// Send the data through thesocket.
int bytesSent = sender.Send(msg);
// Receive the response from the remote device.
int bytesRec = sender.Receive(bytes);
Console.WriteLine("Echoed test = {0}",Encoding.ASCII.GetString(bytes,0,bytesRec));
// Release the socket.
sender.Shutdown(SocketShutdown.Both);
sender.Close();
} catch (ArgumentNullException ane) {Console.WriteLine("ArgumentNullException : {0}",ane.ToString());} catch (SocketException se) {Console.WriteLine("SocketException : {0}",se.ToString());} catch (Exception e) {Console.WriteLine("Unexpected exception : {0}", e.ToString());}
} catch (Exception e) {Console.WriteLine( e.ToString());
}
}
public static int Main(String[] args) {StartClient();
return 0;
}
}
[C#]
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
public class SynchronousSocketListener {// Incoming data from the client.
public static string data = null;
public static void StartListening() {// Data buffer for incoming data.
byte[] bytes = new Byte[1024];
// Establish the local endpoint for thesocket.
//Dns.GetHostName returns the name of the
// host running the application.
IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 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 connections.
try {listener.Bind(localEndPoint);
listener.Listen(10);
// Start listening for connections.
while (true) {Console.WriteLine("Waiting for a connection...");// Program is suspended while waiting for an incoming connection.
Socket handler = listener.Accept();
data = null;
// An incoming connection needs to be processed.
while (true) {bytes = new byte[1024];
int bytesRec = handler.Receive(bytes);
data += Encoding.ASCII.GetString(bytes,0,bytesRec);
if (data.IndexOf("<EOF>") > -1) {break;
}
}
// Show the data on the console.
Console.WriteLine( "Text received : {0}", data);// Echo the data back to the client.
byte[] msg = Encoding.ASCII.GetBytes(data);
handler.Send(msg);
handler.Shutdown(SocketShutdown.Both);
handler.Close();
}
} catch (Exception e) {Console.WriteLine(e.ToString());
}
Console.WriteLine("\nHit enter to continue...");Console.Read();
}
public static int Main(String[] args) {StartListening();
return 0;
}
}
[C#]
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;
// State object for receiving data from remote device.
public class StateObject {public Socket workSocket = null;// Client socket.
public const int BufferSize = 256;// Size of receive buffer.
public byte[] buffer = new byte[BufferSize];// Receive buffer.
public StringBuilder sb = new StringBuilder();// Received data string.
}
public class AsynchronousClient {// The port number for the remote device.
private const int port = 11000;
// ManualResetEvent 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.
// "host.contoso.com" is the name of the
// remote device.
IPHostEntry ipHostInfo = Dns.Resolve("host.contoso.com");IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);
//Create a TCP/IPsocket.
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 test data to the remote device.
Send(client,"This is a test<EOF>");
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 (Exception e) {Console.WriteLine(e.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 (Exception e) {Console.WriteLine(e.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 (Exception e) {Console.WriteLine(e.ToString());
}
}
private static void ReceiveCallback( IAsyncResult ar ) {try {// Retrieve the state object and the client socket
// from the async 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.ASCII.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 (Exception e) {Console.WriteLine(e.ToString());
}
}
private static void Send(Socket client, String data) {// Convert the string data to byte data using ASCII encoding.
byte[] byteData = Encoding.ASCII.GetBytes(data);
// Begin sending the data to the remote device.
client.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), client);
}
private static void SendCallback(IAsyncResult ar) {try {// Retrieve the socket from the state object.
Socket client = (Socket) ar.AsyncState;
// 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 (Exception e) {Console.WriteLine(e.ToString());
}
}
public static int Main(String[] args) {StartClient();
return 0;
}
}
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