MS .Net Framework with emphasis on online gaming

1
MS .Net Framework with emphasis on online gaming

• Ed Mucker
• CS522
• 9 Dec 02

2
Overview

• Online Gaming
• MS .Net Framework
• .Net Framework Class Library
• Project Implementation

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Online Gaming

• Architecture
• Server/Client (request/response through one
  point)
• Peer to peer (client responsible for sending all
  messages)
• Transport Protocol
• TCP - connection with server
• UDP - communication with other players (chat
  functions)
• Number of users
• Dependent on hardware/operating system
  (hundreds/thousands)
• Use of zones to distribute load (one zone per
  server)
• Threading techniques used to accommodate multiple
  users

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MS .Net Framework

• Java architecture for Windows
• Common Language Runtime (JVM)
• MS Intermediate Language (Java Byte Code)
• Executable code machine dependent (MS OS only)
• CLR based languages
• C (very similar to Java)
• VB .Net/Visual C .Net/JScript .Net
• Class interoperability between languages (CLS)
• CLR services
• Automatic garbage collection
• Assemblies/metadata (manifest)

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MS .Net Framework Class Library

• Namespaces
• Similar to packages in Java
• Consists of subordinate namespaces and classes
• Root namespace is System
• Common Subordinate namespaces
• IO, Net, Threading, Runtime.Serialization,
  Windows.Forms
• Use within CLR languages
• Syntax using System.XXXX
• Similar to import statements in Java
• .Net/User defined

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Project Implementation

• Client/Server Architecture
• Generate simple multi-user TCP socket program
• Implementation done in C
• MS .Net Namespaces used
• IO (reader stream)
• Net (Network stream class)
• Net.Sockets (TCP listener/client classes)
• Threading (Thread class)
• Safe Code - Delegates (pointer to function)
• Asynchronous communication with multiple users

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C Programming Example - TCP Listener

• using System.Threading
• public static void Main()
• //var declaration code
• TcpListener listener new TcpListener(8080)
• listener.Start()
• TcpClient client listener.AcceptTcpClient()
• ClientHandler cHandler new ClientHandler()
• cHandler.clientsocket client
• ThreadStart t new ThreadStart(cHandler.RunClient
  )
• Thread clientThread new Thread(t)
• clientThread.Start()
• listener.Stop()

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C Programming Example - RunClient()

• using System.Text using System.Net
• public static void RunClient()
• StreamReader read
• new StreamReader (clientSocket.GetStream())
• NetworkStream write clientSocket.GetStream()
• string returndata read.ReadLine()
• System.Console.WriteLine(returndata)//write data
  to screen
• byte datawrite Encoding.ASCII.GetBytes(return
  data)
• write.Write(datawrite, 0, datawrite.Length)
• clientSocket.Close()

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References

• Multi-Player Game Programming (Barron)
• Understanding .Net (Chappell)
• Professional .Net Network Programming (multiple
  authors)
• Mastering Visual C .Net (Price)

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Questions????