CSharp Socket programming


How to CSharp Socket programming

C# simplifies the schedule through its namespaces like System.Net and System.Net.Sockets . A Socket is associate End-Point of To and From (Bidirectional) communication link between 2 programs (Server Program and consumer Program ) running on a similar network . We want 2 programs for act a socket application in C#. A Server Socket Program ( Server ) and a consumer Socket Program ( consumer ) .

C# socket example

C# Server Socket Program: A C# Server Socket Program running on a pc incorporates a socket that absolute to a Port range on a similar pc and taking note of the client’s incoming requests.

C# consumer Socket Program: A C# consumer Socket Program need to grasp the information science Address ( Hostname ) of the pc that the C# Server Socket Program resides and therefore the Port range assign for listening for client’s request .

Once the association is established between Server and consumer , they will communicate (read or write ) through their own sockets.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 {
// 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();
}

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.
// 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, 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 test data to the remote device.
Send(client,”This is a test“);
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 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.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;
}
}

code reference:http://msdn.microsoft.com/en-us/library/bew39x2a%28v=vs.110%29.aspx

Syed Adeel Ahmed
Analyst, Programmer, Educationist and Blogger at Technofranchise
Computer Systems Engineer from Sir Syed University Of Engineering & Technology.I am passionate about all types of programming.
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Syed Adeel Ahmed

Computer Systems Engineer from Sir Syed University Of Engineering & Technology.I am passionate about all types of programming.

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