Write in C sharp

Another way to improve control when sending TCP messages is a message marker system. This system separates each message by a terminating character to specify the end of the message. As messages are received from the socket, the data is checked character by character for the occurrence of the marker character. In this assignment, the client code sends messages in between two stars *. Your code on the server part will detect these markers and will only pick up the message in between those two stars and show the messages ONLY(no star).

#Server

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

class VarTcpSrvr { 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]; IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 9050);

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

newsock.Bind(ipep); newsock.Listen(10); Console.WriteLine("Waiting for a client...");

Socket client = newsock.Accept(); IPEndPoint newclient = (IPEndPoint)client.RemoteEndPoint; Console.WriteLine("Connected with {0} at port {1}", newclient.Address, newclient.Port);

string welcome = "Welcome to my test server"; data = Encoding.ASCII.GetBytes(welcome); int sent = SendVarData(client, data);

for (int i = 0; i < 5; i++) { data = ReceiveVarData(client); Console.WriteLine(Encoding.ASCII.GetString(data)); } Console.WriteLine("Disconnected from {0}", newclient.Address); client.Close(); newsock.Close(); } }

# Client

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

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(); } }