17. Network Access
The standard cross-platform way of writing network-aware applications is the Berkeley Sockets API. This was written as part of the same grant that developed the TCP/IP and is designed to be protocol-agnostic.
Most languages have an implementation of this API. In Objective-C, you are, as always, free to use the C version, which provides all of the power of the low-level interfaces.
Most of the time, however, this is a lot of effort for very little gain. The Foundation framework provides several classes that make it easier to write networked applications. Using these abstractions sometimes loses you some of the power of the lower-level APIs, but not much.
Wrapping C Sockets
We looked briefly at ...