Borkware: C Callbacks in ObjC.

'''It’s interesting to see common subjects come up in the IRC channels. When someone unfamiliar joins and asks the question “how do I put a method into a function pointer?”, 9 times out of 10 they’re actually wanting to use Cocoa with an existing C API that uses callbacks. A much better question would be “I’m using a C API that uses callbacks with Cocoa, how do I make it work?”'''

And Mark Dalrymple goes on to explain on how exactly you do that. Good tip for those new to Cocoa/Carbon.