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winsock, or BSD sockets
jwatte's picture

How to structure a reusable game networking library

September 3, 2009 - 19:21 — jwatte

I recently have answered several questions about how to structure a networking library such that it can be easy to use for users of the library and/or when expanding the game you're writing. Here are some thoughts on that. (Code examples in C++)

Networking generally ends up needing to do three things:

1) Mirror state updates from one object to another.
2) Request remote services ("RPC").

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tester

July 22, 2009 - 19:58 — jwatte

A simple command-line program that exercises parts of the Etwork API and asserts if something fails. Think of it as an API acceptance test.

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sockimpl.h

July 22, 2009 - 19:57 — jwatte 

#if !defined( etwork_sockimpl_h )
#define etwork_sockimpl_h
 
#include "etwork/etwork.h"
#include "etwork/locker.h"
#include "etwork/buffer.h"
#include "etwork/timer.h"
#include "etwork/errors.h"
#include "etwork/notify.h"
 
#if defined( WIN32 )
#include <windows.h>
#endif
 
#include <stdio.h>  //  for _snprintf
#include <math.h>
 
#include <string>
#include <map>

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socketbase.cpp

July 22, 2009 - 19:42 — jwatte 

#include "sockimpl.h"
 
using namespace etwork;
using namespace etwork::impl;
 
 
SocketManager::SocketManager()
{
  listening_ = INVALID_SOCKET;
  maxNumSocks_ = FD_SETSIZE;
  numSocks_ = 0;
  maxSock_ = 0;
  allSet_ = (fd_set *)::operator new( sizeof(fd_set) );
  FD_ZERO( allSet_ );
  readSet_ = (fd_set *)::operator new( sizeof(fd_set) );
  FD_ZERO( readSet_ );

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HTTP-GET source code download

November 19, 2008 - 11:33 — jwatte

If you've ever wanted to read web pages into your C or C++ program, then this code is for you. It's the smallest possible code that will let you read arbitrary web URLs into your own program. It does NOT have any kind of interesting features, and is not coded to be fully standards compliant, but:

  • it comes with source
  • it's very small
  • it works
jwatte's picture

Extracting packets from a TCP stream

November 6, 2008 - 09:54 — jwatte

When you send packets over TCP, you have to precede them with a byte count, because TCP just delivers a stream of bytes, with no particular block size. If you don't delimit your packets somehow, they will run into each other, and you won't be able to tell where one ends and the next one starts.

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Etwork Quick Start

June 28, 2008 - 10:25 — jwatte

his book will get you started using etwork without too much pain.

Necessary pre-requisites include:

  • Knowledge of C++ programming
  • Microsoft Visual Studio 2005 (or Visual C++ Express 2005 with the Platform SDK addition)
  • The latest version of etwork
jwatte's picture

A simple buffer class for network receive

March 18, 2008 - 12:33 — jwatte
When you develop socket receive code, you will soon run into the problem that TCP will send data in arbitrary blocks. Even if you send a given string in a single call to send(), that string may arrive as two separate recv() calls -- or may arrive glued together with some previous or following data. Or both.
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