I have created a small server using socket programming in c# which will receive a file from a client and save it in a directory. I have made two buttons for the GUI of server. one is 'connect' which will start the server on clicking and the other is 'disconnect' which will stop the server. I have made a text box which is supposed to show a line "server started" when the connect button is pressed. But this is not working when I click on connect button. Moreover, after clicking the 'connect' button, 'disconnect' button isn't working anymore. My sample code is:
using System;
using System.Drawing;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Collections.Generic;
class sampleserver : Form
{
private TextBox newText;
private TextBox conStatus;
private ListBox results;
public TcpClient tcpClient;
public TcpListener tcpListener;
public sampleserver()
{
Text = " TCP Server";
Size = new Size(400, 380);
newText = new TextBox();
newText.Parent = this;
newText.Size = new Size(200, 2 * Font.Height);
newText.Location = new Point(10, 55);
results = new ListBox();
results.Parent = this;
results.Location = new Point(10, 85);
results.Size = new Size(360, 18 * Font.Height);
Label label2 = new Label();
label2.Parent = this;
label2.Text = "Connection Status:";
label2.AutoSize = true;
label2.Location = new Point(10, 330);
conStatus = new TextBox();
conStatus.Parent = this;
conStatus.Text = "Disconnected";
conStatus.Size = new Size(200, 2 * Font.Height);
conStatus.Location = new Point(110, 325);
Button connect = new Button();
connect.Parent = this;
connect.Text = "Connect";
connect.Location = new Point(295, 20);
connect.Size = new Size(6 * Font.Height, 2 * Font.Height);
connect.Click += new EventHandler(ButtonConnectOnClick);
Button discon = new Button();
discon.Parent = this;
discon.Text = "Disconnect";
discon.Location = new Point(295, 52);
discon.Size = new Size(6 * Font.Height, 2 * Font.Height);
discon.Click += new EventHandler(ButtonDisconOnClick);
}
void ButtonDisconOnClick(object obj, EventArgs ea)
{
Close();
}
void ButtonConnectOnClick(object obj, EventArgs ea)
{
TcpListener tcpListener = new TcpListener(IPAddress.Any, 1234);
tcpListener.Start();
newText.Text = "Server started"; //**This line is not working**
//Infinite loop to connect to new clients
while (true)
{
// Accept a TcpClient
TcpClient tcpClient = tcpListener.AcceptTcpClient();
string address = ((IPEndPoint)tcpClient.Client.RemoteEndPoint).Address.ToString();
Console.WriteLine(address);
Console.WriteLine("Connected to client");
byte[] data = new byte[1024];
NetworkStream ns = tcpClient.GetStream();
int recv = ns.Read(data, 0, data.Length);
string id = Encoding.ASCII.GetString(data, 0, recv); //receives a client id
StreamReader reader = new StreamReader(tcpClient.GetStream());
// The first message from the client is the file size
string cmdFileSize = reader.ReadLine();
// The first message from the client is the filename
string cmdFileName = reader.ReadLine();
int length = Convert.ToInt32(cmdFileSize);
byte[] buffer = new byte[length];
int received = 0;
int read = 0;
int size = 1024;
int remaining = 0;
// Read bytes from the client using the length sent from the client
while (received < length)
{
remaining = length - received;
if (remaining < size)
{
size = remaining;
}
read = tcpClient.GetStream().Read(buffer, received, size);
received += read;
}
string root = Environment.CurrentDirectory;
string folder = Path.Combine(root, id);
if (!Directory.Exists(folder)) Directory.CreateDirectory(folder);
string fullFilePath = Path.Combine(folder, Path.GetFileName(cmdFileName));
using (FileStream fStream = new FileStream(fullFilePath, FileMode.Create))
{
fStream.Write(buffer, 0, buffer.Length);
fStream.Flush();
fStream.Close();
}
Console.WriteLine("File received and saved in " + fullFilePath);
}
}
public static void Main()
{
Application.Run(new sampleserver()); }
}
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