The Shape of Everything
A website mostly about Mac stuff, written by August "Gus" Mueller
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December 20, 2007
(This post is from my old, old, super old site. My views have changed over the years, hopefully my writing has improved, and there is now more than a handful of folks reading my site. Enjoy.)

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.