Employee Client : TCP Client : Network C# Source Code

    

/*
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;
   }
}