How to send a file via TCP/socket

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Hello,
I want to send a file via tcp/ip.
I found this code here:

public  void Send(Socket socket, byte[] buffer, int offset, int size, int timeout)
       {

           int port = Convert.ToInt32(txtPort.Text);
           string host = txtIP.Text;

           IPHostEntry address = Dns.GetHostEntry(host);
           IPEndPoint ipe = new IPEndPoint(address.AddressList[0], port);
           int sent = 0;
           using (Socket sock = new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp))
           {
               try
               {
                   sock.Connect(ipe);
                   MessageBox.Show("Conectado");
                   sent += socket.Send(buffer, offset + sent, size - sent, SocketFlags.None);

               }
               catch ( Exception ex)
               {
                   MessageBox.Show(ex.Message);
               }
           }

But when i run the program i got an error:

No connection could be made because the target machine actively refused it

The other computer its say: it is connected to my PC, but nothing happens
I just want to send a file

What I have tried:

C#, TCP/IP, error trying to send a file from my pc to another

Posted 29-Jun-22 7:04am

Luis M. Rojas

Updated 29-Jun-22 7:12am

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Member 4025769 · Answer 1 · 2022-06-29T07:12:00

Solution 1

Do you have a listening "server" on the other side on the choosen port?

Posted 29-Jun-22 7:12am

Member 4025769

Comments

Luis M. Rojas 1-Jul-22 9:27am

Well, i think YES. This is it what i want: I have a vitronic Machine which is running on a server (ip xxx.xxx.xxx, port xxx), this program send an answer in XML, the host (ip xxx.xxx.xxx, port yyy) has to read and send a XML and so on.
I found this code to send and Recive, but nothing happen.

private void startButton_Click(object sender, EventArgs e)
{
//IPEndPoint LocalEndpoint = new IPEndPoint(IPAddress.Parse(txtIP.Text), 20000);
IPEndPoint LocalEndpoint = new IPEndPoint(IPAddress.Parse("xxx.xxx.xxx.xx"), 20000);
Socket _Socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

_Socket.Bind(LocalEndpoint);
_Socket.Listen(10);
_Socket.BeginAccept(new AsyncCallback(Accept), _Socket);
}

private void Accept(IAsyncResult _IAsyncResult)
{
Socket AsyncSocket = (Socket)_IAsyncResult.AsyncState;
Socket dataSocket = AsyncSocket.EndAccept(_IAsyncResult);
var buffer = new byte[1024];
AsyncSocket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(Receive), dataSocket);

}

private void Receive(IAsyncResult _IAsyncResult)
{
Socket AsyncSocket = (Socket)_IAsyncResult.AsyncState;
AsyncSocket.EndReceive(_IAsyncResult);
var buffer = new byte[1024];
var strReceive = Encoding.ASCII.GetString(buffer);
txtXMLRecibido.Text +=strReceive;
AsyncSocket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(Receive), AsyncSocket);
}

private void button1_Click(object sender, EventArgs e)
{
//To conect to the server
if (txtIP.Text == "")
{
lblMensaje.Text = "Debe Digitar el IP";
return;
}

if (txtPort.Text == "")
{
lblMensaje.Text = "Debe Digitar el número de Puerto";
return;
}
IPEndPoint RemoteEndPoint = new IPEndPoint(IPAddress.Parse(txtIP.Text), Convert.ToInt32(txtPort.Text));
Socket _Socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

_Socket.BeginConnect(RemoteEndPoint, new AsyncCallback(Connect), _Socket);

}
private void Connect(IAsyncResult _IAsyncResult)
{
try
{
Socket RemoteSocket = (Socket)_IAsyncResult.AsyncState;
RemoteSocket.EndConnect(_IAsyncResult);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}