title: sending and receiving files socket programming
body: <p>i am developing two application one is server application and other is for handheld device 
  application both communicate using wireless connection.here client is handheld and server is 
  my computer where server application running. when i send files from client to server it send
  perfectly without any error but when client request for files the server produce error
  something like
   "No connection could be made because the target machine actively refused it 192.168.1.5:9050"</p>
  
  <p>server side code:</p>
  
  <pre><code>    private bool SendData(string StrIP)
      {
  
          try
          {
              string strmyFile = Directory.GetCurrentDirectory() + "\\" + "XML" + @"\Login.xml";
              char[] delimiter = splitter.ToCharArray();
              split = strmyFile.Split(delimiter);
              int limit = split.Length;
              fName = split[limit - 1].ToString();
  
              byte[] fileName = Encoding.UTF8.GetBytes(fName); //file name
              byte[] fileData = File.ReadAllBytes(strmyFile); //file
              using (FileStream stream = File.OpenRead(strmyFile))
              {
                  fileData = new byte[stream.Length];
                  stream.Read(fileData, 0, fileData.Length);
              }
  
              byte[] fileNameLen = BitConverter.GetBytes(fileName.Length); //lenght of file name
              clientData = new byte[4 + fileName.Length + fileData.Length];
  
              fileNameLen.CopyTo(clientData, 0);
              fileName.CopyTo(clientData, 4);
              fileData.CopyTo(clientData, 4 + fileName.Length);
  
              System.Net.IPAddress ipAdd = System.Net.IPAddress.Parse(StrIP);
  
              try
              {
                  Socket clientSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                  IPEndPoint ipEnd = new IPEndPoint(ipAdd, 9050);
                  clientSock.Connect(ipEnd); //target machine's ip address and the port number
                  clientSock.Send(clientData);
                  clientSock.Close();
                  ind = 1;
  
                  //Socket Sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                  //IPEndPoint ipEnd = new IPEndPoint(ipAdd, 9050);
                  //Sock.Bind(ipEnd);//target machine's ip address and the port number
                  //Sock.Listen(100);
  
                  //Socket clientSock = Sock.Accept();
  
                  //clientSock.Send(clientData);
                  //clientSock.Close();
                  //ind = 1;
              }
              catch (Exception ex)
              {
  
                  req = false;
                  return false;
  
              }
              req = true;
          }
          catch (Exception ex)
          {
  
          }
          return true;
      }
  
  
      public class StateObject
      {
          // Client socket.
          public Socket workSocket = null;
  
          public const int BufferSize = 1024 * 5000;
          // Receive buffer.
          public byte[] buffer = new byte[BufferSize];
      }
  
      public static ManualResetEvent allDone = new ManualResetEvent(false);
  
      public void StartListening()
      {
  
  
          byte[] bytes = new Byte[1024 * 5000];
          IPEndPoint ipEnd = new IPEndPoint(IPAddress.Any, 9050);
          Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
          try
          {
              listener.Bind(ipEnd);
              listener.Listen(100);
  
              while (true)
              {
                  allDone.Reset();
                 // string ip = listener.RemoteEndPoint.ToString();
                  listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);
                  allDone.WaitOne();
  
              }
          }
          catch (Exception ex)
          {
  
          }
  
      }
  
  
      public void AcceptCallback(IAsyncResult ar)
      {
  
          allDone.Set();
  
  
          Socket listener = (Socket)ar.AsyncState;
          Socket handler = listener.EndAccept(ar);
  
          StateObject state = new StateObject();
          state.workSocket = handler;
          handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
          new AsyncCallback(ReadCallback), state);
  
          flag = 0;
  
      }
  
      private bool req = false;
      public void ReadCallback(IAsyncResult ar)
      {
          try
          {
  
              int fileNameLen = 1;
              String content = String.Empty;
              StateObject state = (StateObject)ar.AsyncState;
              Socket handler = state.workSocket;
              string[] str = new string[2];
              str = handler.RemoteEndPoint.ToString().Split(':');
              string path = Directory.GetCurrentDirectory() + "\\TEST\\" + str[0].ToString();
              if (!Directory.Exists(path))
              {
                  Directory.CreateDirectory(path);
              }
              if (req == false)
              {
                  Sender snddata = new Sender();
                  snddata.sendme(str[0].ToString());
                  SendData(str[0].ToString());
              }
  
              int bytesRead = handler.EndReceive(ar);
  
              if (bytesRead &gt; 0)
              {
                      if (flag == 0)
                      {
                          fileNameLen = BitConverter.ToInt32(state.buffer, 0);
                          string fileName = Encoding.UTF8.GetString(state.buffer, 4, fileNameLen);
                          receivedPath = Directory.GetCurrentDirectory() + "\\TEST\\" + str[0].ToString() + @"\" + fileName;
                          flag++;
                      }
                      if (flag &gt;= 1)
                      {
                          BinaryWriter writer = new BinaryWriter(File.Open(receivedPath, FileMode.Append));
                          if (flag == 1)
                          {
                              writer.Write(state.buffer, 4 + fileNameLen, bytesRead - (4 + fileNameLen));
                              flag++;
                          }
                          else
                              writer.Write(state.buffer, 0, bytesRead);
                          writer.Close();
                          handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                          new AsyncCallback(ReadCallback), state);
                      }
              }
              else
              {
  
                  Invoke(new MyDelegate(LabelWriter));
              }
          }
          catch (Exception ex)
          {
              MessageBox.Show(ex.Message);
  
          }
      }
  public class Sender
  {
      public void sendme(string strIP)
      {
          try
          {
             // MessageBox.Show("That program can transfer small file. I've test up to 850kb file");
              IPEndPoint ipEnd = new IPEndPoint(IPAddress.Any, 9050);
              Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
              sock.Bind(ipEnd);
              sock.Listen(100);
  
              while (true)
              {
                  //clientSock is the socket object of client, so we can use it now to transfer data to client
                  Socket clientSock = sock.Accept();
  
  
                  string fileName =  "Login.xml";// "Your File Name";
                  string filePath = Directory.GetCurrentDirectory() + "\\" + "XML" + @"\" ;//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);
                 //MessageBox.Show("File:{0} has been sent." + fileName);
              }
              //sock.Shutdown(SocketShutdown.Both);
              //sock.Close();
  
  
             // Console.ReadLine();
              //sendme();
          }
          catch (Exception ex)
          {
              MessageBox.Show("File Receiving fail." + ex.Message);
          }
      }
  }
  </code></pre>
  
  <p>client side code:</p>
  
  <pre><code>public class StateObject
      {
          // Client socket.
          public Socket workSocket = null;
  
          public const int BufferSize = 1024;
          // Receive buffer.
          public byte[] buffer = new byte[BufferSize];
      }
  
      public static ManualResetEvent allDone = new ManualResetEvent(false);
  
      public void StartListening()
      {
          byte[] bytes = new Byte[1024];
          IPAddress address = IPAddress.Parse(ServerIP);
          IPEndPoint ipEnd = new IPEndPoint(address, 9050);
          Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
          try
          {
              listener.Bind(ipEnd);
              listener.Listen(100);
  
              while (true)
              {
                  allDone.Reset();
                  // string ip = listener.RemoteEndPoint.ToString();
                  listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);
                  allDone.WaitOne();
  
              }
          }
          catch (Exception ex)
          {
              throw ex;
          }
  
  
      }
  
  
      public void AcceptCallback(IAsyncResult ar)
      {
  
          allDone.Set();
  
  
          Socket listener = (Socket)ar.AsyncState;
          Socket handler = listener.EndAccept(ar);
  
  
          StateObject state = new StateObject();
          state.workSocket = handler;
          handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
          new AsyncCallback(ReadCallback), state);
          flag = 0;
      }
  
      public void ReadCallback(IAsyncResult ar)
      {
  
          try
          {
  
              int fileNameLen = 1;
              String content = String.Empty;
              StateObject state = (StateObject)ar.AsyncState;
              Socket handler = state.workSocket;
              //string[] str = new string[2];
              //str = handler.RemoteEndPoint.ToString().Split(':');
              string path = mypath + "@Login.XML";
              if (!Directory.Exists(path))
              {
                  Directory.CreateDirectory(path);
              }
  
              int bytesRead = handler.EndReceive(ar);
  
              if (bytesRead &gt; 0)
              {
  
                  if (flag == 0)
                  {
                      fileNameLen = BitConverter.ToInt32(state.buffer, 0);
                      string fileName = Encoding.UTF8.GetString(state.buffer, 4, fileNameLen);
                      receivedPath = mypath + "@Login.XML";
                      flag++;
                  }
                  if (flag &gt;= 1)
                  {
                      BinaryWriter writer = new BinaryWriter(File.Open(receivedPath, FileMode.Append));
                      if (flag == 1)
                      {
                          writer.Write(state.buffer, 4 + fileNameLen, bytesRead - (4 + fileNameLen));
                          flag++;
                      }
                      else
                          writer.Write(state.buffer, 0, bytesRead);
                      writer.Close();
                      handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                      new AsyncCallback(ReadCallback), state);
                  }
  
              }
              else
              {
  
                  Invoke(new MyDelegate(LabelWriter));
              }
          }
          catch (Exception ex)
          {
              MessageBox.Show(ex.Message);
  
          }
      }
      public void LabelWriter()
      {
         MessageBox.Show("Data has been received");
         Programs p = new Programs();
         p.GetFile(serverIP);
      }
  </code></pre>
  
  <p>this code is used to get file from server.</p>
  
  <pre><code>private void GetLoginTemp()
      {
          Socket clientSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
          try
          {
              char[] delimiter = splitter.ToCharArray();
              byte[] fileName = Encoding.UTF8.GetBytes("empty"); //file name
              byte[] fileData;
              fileData = Encoding.UTF8.GetBytes("empty");
              //byte[] fileData = reads.ReadToEnd().to; //file
              byte[] fileNameLen = BitConverter.GetBytes(fileName.Length); //lenght of file name
              clientData = new byte[4 + fileName.Length + fileData.Length];
  
              fileNameLen.CopyTo(clientData, 0);
              fileName.CopyTo(clientData, 4);
              fileData.CopyTo(clientData, 4 + fileName.Length);
              System.Net.IPAddress ipAdd = System.Net.IPAddress.Parse(serverIP);
  
              IPEndPoint ipEnd = new IPEndPoint(ipAdd, 9050);
              clientSock.Connect(ipEnd); //target machine's ip address and the port number
              clientSock.Send(clientData);
  
              byte[] clientData1 = new byte[1024 * 5000];
              string receivedPath = mypath + @"\XML" + @"\Login.xml";
  
              int receivedBytesLen = clientSock.Receive(clientData1);
  
              int fileNameLen1 = BitConverter.ToInt32(clientData1, 0);
              string fileName1 = Encoding.ASCII.GetString(clientData1, 4, fileNameLen1);
  
              BinaryWriter bWrite = new BinaryWriter(File.Open(receivedPath + fileName, FileMode.Append)); ;
              bWrite.Write(clientData, 4 + fileNameLen1, receivedBytesLen - 4 - fileNameLen1);
              //clientSock.Shutdown(SocketShutdown.Send);
  
              clientSock.Close();
          }
          catch (Exception ex)
          {
              clientSock.Close();
              MessageBox.Show(ex.Message);
          }
      }
  </code></pre>