/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.Text;
using System.Net;
using System.Net.Sockets;


public class EmployeeClient
{
   public static void Main()
   {
      Employee emp1 = new Employee();
      Employee emp2 = new Employee();
      TcpClient client;

      emp1.EmployeeID = 1;
      emp1.LastName = "Blum";
      emp1.FirstName = "Katie Jane";
      emp1.YearsService = 12;
      emp1.Salary = 35000.50;

      emp2.EmployeeID = 2;
      emp2.LastName = "Blum";
      emp2.FirstName = "Jessica";
      emp2.YearsService = 9;
      emp2.Salary = 23700.30;

      try
      {
         client = new TcpClient("127.0.0.1", 9050);
      } catch (SocketException)
      {
         Console.WriteLine("Unable to connect to server");
         return;
      }
      NetworkStream ns = client.GetStream();

      byte[] data = emp1.GetBytes();
      int size = emp1.size;
      byte[] packsize = new byte[2];
      Console.WriteLine("packet size = {0}", size);
      packsize = BitConverter.GetBytes(size);
      ns.Write(packsize, 0, 2);
      ns.Write(data, 0, size);
      ns.Flush();

      data = emp2.GetBytes();
      size = emp2.size;
      packsize = new byte[2];
      Console.WriteLine("packet size = {0}", size);
      packsize = BitConverter.GetBytes(size);
      ns.Write(packsize, 0, 2);
      ns.Write(data, 0, size);
      ns.Flush();
   
      ns.Close();
      client.Close();    
   }
}




public class Employee
{
   public int EmployeeID;
   private int LastNameSize;
   public string LastName;
   private int FirstNameSize;
   public string FirstName;
   public int YearsService;
   public double Salary;
   public int size;

   public Employee()
   {
   }

   public Employee(byte[] data)
   {
      int place = 0;
      EmployeeID = BitConverter.ToInt32(data, place);
      place += 4;
      LastNameSize = BitConverter.ToInt32(data, place);
      place += 4;
      LastName = Encoding.ASCII.GetString(data, place, LastNameSize);
      place = place + LastNameSize;
      FirstNameSize = BitConverter.ToInt32(data, place);
      place += 4;
      FirstName = Encoding.ASCII.GetString(data, place, FirstNameSize);
      place += FirstNameSize;
      YearsService = BitConverter.ToInt32(data, place);
      place += 4;
      Salary = BitConverter.ToDouble(data, place);
   }

   public byte[] GetBytes()
   {
      byte[] data = new byte[1024];
      int place = 0;
      Buffer.BlockCopy(BitConverter.GetBytes(EmployeeID), 0, data, place, 4);
      place += 4;
      Buffer.BlockCopy(BitConverter.GetBytes(LastName.Length), 0, data, place, 4);
      place += 4;
      Buffer.BlockCopy(Encoding.ASCII.GetBytes(LastName), 0, data, place, LastName.Length);
      place += LastName.Length;
      Buffer.BlockCopy(BitConverter.GetBytes(FirstName.Length), 0, data, place, 4);
      place += 4;
      Buffer.BlockCopy(Encoding.ASCII.GetBytes(FirstName), 0, data, place, FirstName.Length);
      place += FirstName.Length;
      Buffer.BlockCopy(BitConverter.GetBytes(YearsService), 0, data, place, 4);
      place += 4;
      Buffer.BlockCopy(BitConverter.GetBytes(Salary), 0, data, place, 8);
      place += 8;
      size = place;
      return data;
   }
}

           
          

   

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class StreamTcpClient
{
   public static void Main()
   {
      string data;
      string input;
      IPEndPoint ipep = new IPEndPoint(
                      IPAddress.Parse("127.0.0.1"), 9050);

      Socket server = new Socket(AddressFamily.InterNetwork,
                     SocketType.Stream, ProtocolType.Tcp);

      try
      {
         server.Connect(ipep);
      } catch (SocketException e)
      {
         Console.WriteLine("Unable to connect to server.");
         Console.WriteLine(e.ToString());
         return;
      }


      NetworkStream ns = new NetworkStream(server);
      StreamReader sr = new StreamReader(ns);
      StreamWriter sw = new StreamWriter(ns);

      data = sr.ReadLine();
      Console.WriteLine(data);

      while(true)
      {
         input = Console.ReadLine();
         if (input == "exit")
            break;
         sw.WriteLine(input);
         sw.Flush();

         data = sr.ReadLine();
         Console.WriteLine(data);
      }
      Console.WriteLine("Disconnecting from server...");
      sr.Close();
      sw.Close();
      ns.Close();
      server.Shutdown(SocketShutdown.Both);
      server.Close();
   }
}

           
          

/*
C# Network Programming
by Richard Blum

Publisher: Sybex
ISBN: 0782141765
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class FixedTcpClient
{
private static int SendData(Socket s, byte[] data)
{
int total = 0;
int size = data.Length;
int dataleft = size;
int sent;

while (total < size) { sent = s.Send(data, total, dataleft, SocketFlags.None); total += sent; dataleft -= sent; } return total; } private static byte[] ReceiveData(Socket s, int size) { int total = 0; int dataleft = size; byte[] data = new byte[size]; int recv; while(total < size) { recv = s.Receive(data, total, dataleft, 0); if (recv == 0) { data = Encoding.ASCII.GetBytes("exit "); break; } total += recv; dataleft -= recv; } return data; } public static void Main() { byte[] data = new byte[1024]; int sent; IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9050); Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); try { server.Connect(ipep); } catch (SocketException e) { Console.WriteLine("Unable to connect to server."); Console.WriteLine(e.ToString()); return; } int recv = server.Receive(data); string stringData = Encoding.ASCII.GetString(data, 0, recv); Console.WriteLine(stringData); sent = SendData(server, Encoding.ASCII.GetBytes("message 1")); sent = SendData(server, Encoding.ASCII.GetBytes("message 2")); sent = SendData(server, Encoding.ASCII.GetBytes("message 3")); sent = SendData(server, Encoding.ASCII.GetBytes("message 4")); sent = SendData(server, Encoding.ASCII.GetBytes("message 5")); Console.WriteLine("Disconnecting from server..."); server.Shutdown(SocketShutdown.Both); server.Close(); } } [/csharp]

   

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class BadTcpClient
{
   public static void Main()
   {
      byte[] data = new byte[1024];
      string stringData;
      IPEndPoint ipep = new IPEndPoint(
                      IPAddress.Parse("127.0.0.1"), 9050);

      Socket server = new Socket(AddressFamily.InterNetwork,
                     SocketType.Stream, ProtocolType.Tcp);

      try
      {
         server.Connect(ipep);
      } catch (SocketException e)
      {
         Console.WriteLine("Unable to connect to server.");
         Console.WriteLine(e.ToString());
         return;
      }


      int recv = server.Receive(data);
      stringData = Encoding.ASCII.GetString(data, 0, recv);
      Console.WriteLine(stringData);

      server.Send(Encoding.ASCII.GetBytes("message 1"));
      server.Send(Encoding.ASCII.GetBytes("message 2"));
      server.Send(Encoding.ASCII.GetBytes("message 3"));
      server.Send(Encoding.ASCII.GetBytes("message 4"));
      server.Send(Encoding.ASCII.GetBytes("message 5"));
      Console.WriteLine("Disconnecting from server...");
      server.Shutdown(SocketShutdown.Both);
      server.Close();
   }
}
           
          

/*
C# Network Programming
by Richard Blum

Publisher: Sybex
ISBN: 0782141765
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class VarTcpClient
{
private static int SendVarData(Socket s, byte[] data)
{
int total = 0;
int size = data.Length;
int dataleft = size;
int sent;

byte[] datasize = new byte[4];
datasize = BitConverter.GetBytes(size);
sent = s.Send(datasize);

while (total < size) { sent = s.Send(data, total, dataleft, SocketFlags.None); total += sent; dataleft -= sent; } return total; } private static byte[] ReceiveVarData(Socket s) { int total = 0; int recv; byte[] datasize = new byte[4]; recv = s.Receive(datasize, 0, 4, 0); int size = BitConverter.ToInt32(datasize, 0); int dataleft = size; byte[] data = new byte[size]; while(total < size) { recv = s.Receive(data, total, dataleft, 0); if (recv == 0) { data = Encoding.ASCII.GetBytes("exit "); break; } total += recv; dataleft -= recv; } return data; } public static void Main() { byte[] data = new byte[1024]; int sent; IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9050); Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); try { server.Connect(ipep); } catch (SocketException e) { Console.WriteLine("Unable to connect to server."); Console.WriteLine(e.ToString()); return; } data = ReceiveVarData(server); string stringData = Encoding.ASCII.GetString(data); Console.WriteLine(stringData); string message1 = "This is the first test"; string message2 = "A short test"; string message3 = "This string is an even longer test. The quick brown fox jumps over the lazy dog."; string message4 = "a"; string message5 = "The last test"; sent = SendVarData(server, Encoding.ASCII.GetBytes(message1)); sent = SendVarData(server, Encoding.ASCII.GetBytes(message2)); sent = SendVarData(server, Encoding.ASCII.GetBytes(message3)); sent = SendVarData(server, Encoding.ASCII.GetBytes(message4)); sent = SendVarData(server, Encoding.ASCII.GetBytes(message5)); Console.WriteLine("Disconnecting from server..."); server.Shutdown(SocketShutdown.Both); server.Close(); } } [/csharp]

   

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class SimpleTcpClient
{
   public static void Main()
   {
      byte[] data = new byte[1024];
      string input, stringData;
      IPEndPoint ipep = new IPEndPoint(
                      IPAddress.Parse("127.0.0.1"), 9050);

      Socket server = new Socket(AddressFamily.InterNetwork,
                     SocketType.Stream, ProtocolType.Tcp);

      try
      {
         server.Connect(ipep);
      } catch (SocketException e)
      {
         Console.WriteLine("Unable to connect to server.");
         Console.WriteLine(e.ToString());
         return;
      }


      int recv = server.Receive(data);
      stringData = Encoding.ASCII.GetString(data, 0, recv);
      Console.WriteLine(stringData);

      while(true)
      {
         input = Console.ReadLine();
         if (input == "exit")
            break;
         server.Send(Encoding.ASCII.GetBytes(input));
         data = new byte[1024];
         recv = server.Receive(data);
         stringData = Encoding.ASCII.GetString(data, 0, recv);
         Console.WriteLine(stringData);
      }
      Console.WriteLine("Disconnecting from server...");
      server.Shutdown(SocketShutdown.Both);
      server.Close();
   }
}
           
          

   

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class NetworkStreamTcpClient
{
   public static void Main()
   {
      byte[] data = new byte[1024];
      string input, stringData;
      int recv;
      IPEndPoint ipep = new IPEndPoint(
                      IPAddress.Parse("127.0.0.1"), 9050);

      Socket server = new Socket(AddressFamily.InterNetwork,
                     SocketType.Stream, ProtocolType.Tcp);

      try
      {
         server.Connect(ipep);
      } catch (SocketException e)
      {
         Console.WriteLine("Unable to connect to server.");
         Console.WriteLine(e.ToString());
         return;
      }

      NetworkStream ns = new NetworkStream(server);

      if (ns.CanRead)
      {
         recv = ns.Read(data, 0, data.Length);
         stringData = Encoding.ASCII.GetString(data, 0, recv);
         Console.WriteLine(stringData);
      }
      else
      {
         Console.WriteLine("Error: Can't read from this socket");
         ns.Close();
         server.Close();
         return;
      }

      while(true)
      {
         input = Console.ReadLine();
         if (input == "exit")
            break;
         if (ns.CanWrite)
         {
            ns.Write(Encoding.ASCII.GetBytes(input), 0, input.Length);
            ns.Flush();
         }

         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.Shutdown(SocketShutdown.Both);
      server.Close();
   }
}