using System;
using System.IO;
using System.Net.Sockets;
class MainClass
{
const int echoPort = 7;
[STAThread]
static void Main(string[] args)
{
using ( TcpClient tc = new TcpClient( "localhost", echoPort ) )
{
NetworkStream ns = tc.GetStream();
StreamWriter sw = new StreamWriter( ns );
StreamReader sr = new StreamReader( ns );
sw.WriteLine( "test message" );
sw.Flush();
System.Console.WriteLine( sr.ReadLine() );
}
}
}using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
class MainClass
{
const int echoPort = 7;
[STAThread]
static void Main( string[] args )
{
Socket s = new Socket( AddressFamily.InterNetwork,
SocketType.Stream,
ProtocolType.Tcp );
s.Connect( new IPEndPoint( IPAddress.Loopback, echoPort ) );
UTF8Encoding enc = new UTF8Encoding();
s.Send( enc.GetBytes( "test message" ) );
Byte[] buff = new Byte[ 1024 ];
s.Receive( buff );
System.Console.WriteLine( enc.GetString( buff ) );
}
}/*
Quote from
C# Network Programming
# Paperback: 656 pages
# Publisher: Sybex (November 26, 2002)
# Language: English
# ISBN-10: 0782141765
# ISBN-13: 978-0782141764
*/
using System;
using System.Drawing;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Windows.Forms;
public class AsyncTcpClient : Form
{
private TextBox newText;
private TextBox conStatus;
private ListBox results;
private Socket client;
private byte[] data = new byte[1024];
private int size = 1024;
public AsyncTcpClient()
{
Text = "Asynchronous TCP Client";
Size = new Size(400, 380);
Label label1 = new Label();
label1.Parent = this;
label1.Text = "Enter text string:";
label1.AutoSize = true;
label1.Location = new Point(10, 30);
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 sendit = new Button();
sendit.Parent = this;
sendit.Text = "Send";
sendit.Location = new Point(220,52);
sendit.Size = new Size(5 * Font.Height, 2 * Font.Height);
sendit.Click += new EventHandler(ButtonSendOnClick);
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 ButtonConnectOnClick(object obj, EventArgs ea)
{
conStatus.Text = "Connecting...";
Socket newsock = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
IPEndPoint iep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9050);
newsock.BeginConnect(iep, new AsyncCallback(Connected), newsock);
}
void ButtonSendOnClick(object obj, EventArgs ea)
{
byte[] message = Encoding.ASCII.GetBytes(newText.Text);
newText.Clear();
client.BeginSend(message, 0, message.Length, SocketFlags.None, new AsyncCallback(SendData), client);
}
void ButtonDisconOnClick(object obj, EventArgs ea)
{
client.Close();
conStatus.Text = "Disconnected";
}
void Connected(IAsyncResult iar)
{
client = (Socket)iar.AsyncState;
try
{
client.EndConnect(iar);
conStatus.Text = "Connected to: " + client.RemoteEndPoint.ToString();
client.BeginReceive(data, 0, size, SocketFlags.None,
new AsyncCallback(ReceiveData), client);
} catch (SocketException)
{
conStatus.Text = "Error connecting";
}
}
void ReceiveData(IAsyncResult iar)
{
Socket remote = (Socket)iar.AsyncState;
int recv = remote.EndReceive(iar);
string stringData = Encoding.ASCII.GetString(data, 0, recv);
results.Items.Add(stringData);
}
void SendData(IAsyncResult iar)
{
Socket remote = (Socket)iar.AsyncState;
int sent = remote.EndSend(iar);
remote.BeginReceive(data, 0, size, SocketFlags.None,new AsyncCallback(ReceiveData), remote);
}
public static void Main()
{
Application.Run(new AsyncTcpClient());
}
}using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
class MainClass
{
public static void Main()
{
IPAddress host = IPAddress.Parse("192.168.1.1");
IPEndPoint hostep = new IPEndPoint(host, 8000);
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
sock.Connect(hostep);
} catch (SocketException e) {
Console.WriteLine("Problem connecting to host");
Console.WriteLine(e.ToString());
sock.Close();
return;
}
try
{
sock.Send(Encoding.ASCII.GetBytes("testing"));
} catch (SocketException e) {
Console.WriteLine("Problem sending data");
Console.WriteLine( e.ToString());
sock.Close();
return;
}
sock.Close();
}
}using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
class MainClass
{
public static void Main()
{
IPEndPoint ip = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9999);
Socket server = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);
try
{
server.Connect(ip);
} catch (SocketException e){
Console.WriteLine("Unable to connect to server.");
return;
}
byte[] data = new byte[1024];
int receivedDataLength = server.Receive(data);
string stringData = Encoding.ASCII.GetString(data, 0, receivedDataLength);
Console.WriteLine(stringData);
server.Shutdown(SocketShutdown.Both);
server.Close();
}
}using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
class MainClass
{
public static void Main()
{
IPEndPoint ip = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9999);
Socket server = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);
try
{
server.Connect(ip);
} catch (SocketException e){
Console.WriteLine("Unable to connect to server.");
return;
}
Console.WriteLine("Type "exit" to exit.");
while(true)
{
string input = Console.ReadLine();
if (input == "exit")
break;
server.Send(Encoding.ASCII.GetBytes(input));
byte[] data = new byte[1024];
int receivedDataLength = server.Receive(data);
string stringData = Encoding.ASCII.GetString(data, 0, receivedDataLength);
Console.WriteLine(stringData);
}
server.Shutdown(SocketShutdown.Both);
server.Close();
}
}using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
class MainClass
{
public static void Main()
{
IPEndPoint ip = new IPEndPoint(IPAddress.Any,9999);
Socket socket = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);
socket.Bind(ip);
socket.Listen(10);
Console.WriteLine("Waiting for a client...");
Socket client = socket.Accept();
IPEndPoint clientep =(IPEndPoint)client.RemoteEndPoint;
Console.WriteLine("Connected with {0} at port {1}",clientep.Address, clientep.Port);
string welcome = "Welcome";
byte[] data = new byte[1024];
data = Encoding.ASCII.GetBytes(welcome);
client.Send(data, data.Length,SocketFlags.None);
Console.WriteLine("Disconnected from {0}",clientep.Address);
client.Close();
socket.Close();
}
}using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
class MainClass
{
public static void Main()
{
IPAddress host = IPAddress.Parse("192.168.1.1");
IPEndPoint hostep = new IPEndPoint(host, 8000);
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
sock.Connect(hostep);
} catch (SocketException e) {
Console.WriteLine("Problem connecting to host");
Console.WriteLine(e.ToString());
sock.Close();
return;
}
sock.Close();
}
}