The function-ptr code was the exact fix I needed to get it working. I wasn't even thinking about the fact that _cpv was a function pointer. Thank you so much for the help.
On Tue, Jun 5, 2012 at 4:44 AM, Matthew Flatt <mfl...@cs.utah.edu> wrote: > At Tue, 5 Jun 2012 00:43:05 -0400, Vince Kuyatt wrote: >> For example, I have the simple definition in Racket: >> (define cpv >> (get-ffi-obj "_cpv" chipmunk (_fun _cpFloat _cpFloat -> _cpVect))) >> > > At Tue, 5 Jun 2012 10:33:31 +0200, Jens Axel Søgaard wrote: >> I think the names with underscore is defined my MAKE_REF here: >> >> http://code.google.com/p/chipmunk-physics/source/browse/trunk/include/chipmunk/chipmunk_ffi.h > > If `_cpv' is really a pointer to cpv(), then `(_fun ...)' isn't the > right type. Use > > (define cpv > (function-ptr (get-ffi-obj "_cpv" chipmunk _pointer) > (_fun _cpFloat _cpFloat -> _cpVect))) > > instead. > ____________________ Racket Users list: http://lists.racket-lang.org/users
