Socket Programming in C# .Net

Send File from Server to Client using C# Socket Programming

 

One small hints, about how this is working - First client try to connect to server. Then in server side, server gets a object of client socket. In past all time by that socket object data was transferred from client to server. But now server sends data to client using same socket. This is just opposite of Client to server file transfer.

Client code:

using System;

using System.Collections.Generic;

using System.Text;

using System.Net;

using System.Net.Sockets;

using System.IO;

namespace Client_Socket

{

//FILE TRANSFER USING C#.NET SOCKET - CLIENT

class Program

{

static void Main(string[] args)

{

try

{

Console.WriteLine("That program can transfer small file. I've test up to 850kb file");

IPAddress[] ipAddress = Dns.GetHostAddresses("localhost");

IPEndPoint ipEnd = new IPEndPoint(ipAddress[0], 5656);

Socket clientSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);

clientSock.Connect(ipEnd);

byte[] clientData = new byte[1024 * 5000];

string receivedPath = "C:/";

int receivedBytesLen = clientSock.Receive(clientData);

int fileNameLen = BitConverter.ToInt32(clientData, 0);

string fileName = Encoding.ASCII.GetString(clientData, 4, fileNameLen);

Console.WriteLine("Client:{0} connected & File {1} started received.", clientSock.RemoteEndPoint, fileName);

BinaryWriter bWrite = new BinaryWriter(File.Open(receivedPath + fileName, FileMode.Append)); ;

bWrite.Write(clientData, 4 + fileNameLen, receivedBytesLen - 4 - fileNameLen);

Console.WriteLine("File: {0} received & saved at path: {1}", fileName, receivedPath);

bWrite.Close();

clientSock.Close();

Console.ReadLine();

}

catch (Exception ex)

{

Console.WriteLine("File Sending fail." + ex.Message);

}

}

}

}

Server code:

using System;

using System.Collections.Generic;

using System.Text;

using System.Net;

using System.Net.Sockets;

using System.IO;

namespace beginSocketServer

{

//FILE TRANSFER USING C#.NET SOCKET - SERVER

class Program

{

static void Main(string[] args)

{

try

{

Console.WriteLine("That program can transfer small file. I've test up to 850kb file");

IPEndPoint ipEnd = new IPEndPoint(IPAddress.Any, 5656);

Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);

sock.Bind(ipEnd);

sock.Listen(100);

//clientSock is the socket object of client, so we can use it now to transfer data to client

Socket clientSock = sock.Accept();

string fileName = "test.txt";// "Your File Name";

string filePath = @"C:\FT\";//Your File Path;

byte[] fileNameByte = Encoding.ASCII.GetBytes(fileName);

byte[] fileData = File.ReadAllBytes(filePath + fileName);

byte[] clientData = new byte[4 + fileNameByte.Length + fileData.Length];

byte[] fileNameLen = BitConverter.GetBytes(fileNameByte.Length);

fileNameLen.CopyTo(clientData, 0);

fileNameByte.CopyTo(clientData, 4);

fileData.CopyTo(clientData, 4 + fileNameByte.Length);

clientSock.Send(clientData);

Console.WriteLine("File:{0} has been sent.", fileName);

clientSock.Close();

Console.ReadLine();

}

catch (Exception ex)

{

Console.WriteLine("File Receiving fail." + ex.Message);

}

}

}

}