From: Scott Gonyea <scott@...>
Date: 2010-10-12T00:42:28+09:00
Subject: Objective-C Ruby Extension

Hi Everyone,

While toying around, I decided to start work on a trivial Objective-C
Ruby Extension / eventual tutorial "because I can." Which is the best
reasoning for anything, ever. It's a tad incomplete, but I'd love to
get some feedback so far, if anyone has any:

http://github.com/aitrus/objc_ruby-ext

Note: This isn't Mac specific, ala RubyCocoa / MacRuby / yadda.

Issues Getting it to Work:

- mkmf hardcodes the '.c' extension as the only file extension that
you can compile with the C compiler. You can work around this a
variety of ways, but they're all hackish.
- Data_Get_Struct does not work, as it seems to be checking to make
sure you're giving it a struct datatype.  The only real work around
for this was to pull out its DATA_PTR line, bypassing its primitive
type checking.
-- Rather than: Data_Get_Struct(self, Fraction, frac);
-- I write: frac = (Fraction*)DATA_PTR(self);

Everything seems to play just peachy with Ruby.

Scott