TrinityCore由生成两个运行文件authserver和world server以及一堆DLL（或so）文件的子项目组成（先忽略map_extractor等几个工具项目）。

         authserver是登录验证服，它主要提供登录验证和获取服务器（区服）列表的功能。world server是真正的游戏服务器，提供游戏里的一切功能。相对而言，auth server比較简单，那我就从它入手啊，先看一下它的main函数，在源代码的基础上，我加上了凝视。

//该函数在src\server\authserver\Main.cpp中  int main(int argc, char** argv)  {      std::string configFile = _TRINITY_REALM_CONFIG;        //读取程序的參数，存入variables_map中      //假设參数中含有help，则输出信息，中止程序      auto vm = GetConsoleArguments(argc, argv, configFile);      // exit if help is enabled      if (vm.count("help"))          return 0;        //读取配置文件      std::string configError;      if (!sConfigMgr->LoadInitial(configFile, configError))      {          printf("Error in config file: %s\n", configError.c_str());          return 1;      }        //向控制台输出一配置信息      TC_LOG_INFO("server.authserver", "%s (authserver)", _FULLVERSION);      TC_LOG_INFO("server.authserver", "
     
       to stop.\n");      TC_LOG_INFO("server.authserver", "Using configuration file %s.", configFile.c_str());      TC_LOG_INFO("server.authserver", "Using SSL version: %s (library: %s)", OPENSSL_VERSION_TEXT, SSLeay_version(SSLEAY_VERSION));      TC_LOG_INFO("server.authserver", "Using Boost version: %i.%i.%i", BOOST_VERSION / 100000, BOOST_VERSION / 100 % 1000, BOOST_VERSION % 100);        // authserver PID file creation      //创建一个文件，向当中写入PID      std::string pidFile = sConfigMgr->GetStringDefault("PidFile", "");      if (!pidFile.empty())      {          if (uint32 pid = CreatePIDFile(pidFile))              TC_LOG_INFO("server.authserver", "Daemon PID: %u\n", pid);          else          {              TC_LOG_ERROR("server.authserver", "Cannot create PID file %s.\n", pidFile.c_str());              return 1;          }      }        // Initialize the database connection      //初始化程序的数据库连接      if (!StartDB())          return 1;        // Get the list of realms for the server      //初始化world server列表      //也就是在auth数据库运行："SELECT id, name, address, localAddress, localSubnetMask, port, icon,       //flag, timezone, allowedSecurityLevel, population, gamebuild FROM realmlist WHERE flag <> 3 ORDER BY name"      //并将结果存入单例类RealmList的m_realms中      sRealmList->Initialize(_ioService, sConfigMgr->GetIntDefault("RealmsStateUpdateDelay", 20));        if (sRealmList->size() == 0)      {          TC_LOG_ERROR("server.authserver", "No valid realms specified.");          StopDB();          return 1;      }        // Start the listening port (acceptor) for auth connections      //从配置文件里读取监听的IP和端口      int32 port = sConfigMgr->GetIntDefault("RealmServerPort", 3724);      if (port < 0 || port > 0xFFFF)      {          TC_LOG_ERROR("server.authserver", "Specified port out of allowed range (1-65535)");          StopDB();          return 1;      }        std::string bindIp = sConfigMgr->GetStringDefault("BindIP", "0.0.0.0");        //初始化auth server      AsyncAcceptor
      
        authServer(_ioService, bindIp, port);        // Set signal handlers      //绑定SIGINT（退出）信号的处理函数      boost::asio::signal_set signals(_ioService, SIGINT, SIGTERM);  #if PLATFORM == PLATFORM_WINDOWS      signals.add(SIGBREAK);  #endif      signals.async_wait(SignalHandler);        // Set process priority according to configuration settings      //设置进程（线程）的优先级      SetProcessPriority("server.authserver");        // Enabled a timed callback for handling the database keep alive ping      //添加一个定时器，用于与数据库保持心跳连接      _dbPingInterval = sConfigMgr->GetIntDefault("MaxPingTime", 30);      _dbPingTimer.expires_from_now(boost::posix_time::minutes(_dbPingInterval));      _dbPingTimer.async_wait(KeepDatabaseAliveHandler);        // Start the io service worker loop      //開始事件循环      _ioService.run();        // Close the Database Pool and library      //关闭数据库      StopDB();        TC_LOG_INFO("server.authserver", "Halting process...");      return 0;  }