涵盖有Socket相关的介绍，配有代码，有iOS充当客户端、服务端。

BSDSocket相关: 若干文档，若干代码。 NetCommandHelper* NetCommandHelper::getInstance() { static NetCommandHelper* s_netCommandHelper = nullptr; if (s_netCommandHelper == nullptr) { s_netCommandHelper = new NetCommandHelper(); s_netCommandHelper->init();