Baran Topal

Baran Topal


December 2022
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File transfer over LAN and WAN in C#

baranbaran

Here is another gem in C#. I need to test this though 🙂


//Client side
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.IO;

namespace ClientServer
{
    //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("127.0.0.1");
                IPEndPoint ipEnd = new IPEndPoint(ipAddress[0], 5656);
                Socket clientSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                clientSock.Connect(ipEnd);

                byte[] clientData = new byte[1024 * 5000];
                string receivedPath = "C:/jazzIIIlove";

                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(Path.Combine(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 side
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.Parse("127.0.0.1"),5656);
                Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                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 = "aaa.bin";// "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);
            }
        }
    }
}