/*
C# Network Programming
by Richard Blum
Publisher: Sybex
ISBN: 0782141765
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Security;
using System.Security.Permissions;
using System.Text;
[SocketPermission(SecurityAction.Deny, Access="Connect", Host="127.0.0.1",
Port="All", Transport="All")]
[SocketPermission(SecurityAction.Deny, Access="Connect", Host="192.168.0.2",
Port="All", Transport="All")]
[SocketPermission(SecurityAction.Deny, Access="Connect", Host="192.168.1.100",
Port="80", Transport="All")]
public class PickyTcpClient
{
public static void Main()
{
byte[] data = new byte[1024];
string input, stringData;
TcpClient server = null;
Console.Write("Enter a host to connect to: ");
string stringHost = Console.ReadLine();
try
{
server = new TcpClient(stringHost, 9050);
} catch (SocketException)
{
Console.WriteLine("Unable to connect to server");
return;
} catch (SecurityException)
{
Console.WriteLine(
"Sorry, you are restricted from connecting to this server");
return;
}
NetworkStream ns = server.GetStream();
int recv = ns.Read(data, 0, data.Length);
stringData = Encoding.ASCII.GetString(data, 0, recv);
Console.WriteLine(stringData);
while(true)
{
input = Console.ReadLine();
if (input == "exit")
break;
ns.Write(Encoding.ASCII.GetBytes(input), 0, input.Length);
ns.Flush();
data = new byte[1024];
recv = ns.Read(data, 0, data.Length);
stringData = Encoding.ASCII.GetString(data, 0, recv);
Console.WriteLine(stringData);
}
Console.WriteLine("Disconnecting from server...");
ns.Close();
server.Close();
}
}
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