[Pyrex] need help getting started

[horace]

hi,

i try to use pyrex to do a python binding for newton game dynamics (
www.newtondynamics.com <http://www.newtondynamics.com>) and would need some
help to get started.





the header looks like that:

typedef struct NewtonWorld{} NewtonWorld;

// Newton callback functions
typedef void* (*NewtonAllocMemory) (int sizeInBytes);
typedef void (*NewtonFreeMemory) (void *ptr, int sizeInBytes);

// world control functions
NEWTON_API NewtonWorld* NewtonCreate (NewtonAllocMemory malloc,
NewtonFreeMemory mfree);
NEWTON_API void NewtonDestroy (const NewtonWorld* newtonWorld);



and i have this pyrex file so far:

cdef extern from "newton.h":
 ctypedef struct NewtonWorld

 ctypedef NewtonAllocMemory
 ctypedef NewtonFreeMemory

 NewtonWorld* NewtonCreate(NewtonAllocMemory malloc, NewtonFreeMemory mfree)
 void NewtonDestroy(NewtonWorld* newtonWorld)

def create():
 cdef NewtonWorld* w
 w = NewtonCreate(NULL, NULL)
 return w

def destroy(world):
 cdef NewtonWorld* w
w = world
 NewtonDestroy(w)



the first problem is i have no idea how to ignore the memory management
callbacks. i don't need them so i tried to define incomplete types and pass
NULL but this doesn't work.

the second problem is i don't know how to pass the NewtonWorld pointer
around between python and pyrex?



it would be very nice if someone could give me some tips! probably i am too
inexperienced to do something like this since i only know python and no c
but i guess with some help for the first few functions maybe i could handle
it.



thanks in advance!
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