On Fri, Sep 15, 2017 at 9:42 PM, alvaro piorno <alvaropiorno100@gmail.com> wrote:

Hi everybody, i��m using UnifiedFFI with Chipmunk2D library .

I want to get a pointer to a C Structure (cpBody) and set a position to it.

I have a subClass of FFIOpaqueObject to handle pointer.

This is the "new " ffiCall :

�� �� self ffiCall: #(cpBody* cpBodyNew(cpFloat m, cpFloat i))

And this is a "seter" ffiCall:

�� �� self ffiCall: #( void cpBodySetPosition( self, cpVect vector ) ).

I`m not getting any "error" but the position is not updating.

I tried the same using Chipmunk directly and it works, so there is a problem with what i have in Pharo.

A general approach might be to write your own C wrapper around Chipmunk library functions which��

just does a debug printout of parameters before calling the wrapped function.

Use these for both from Pharo and your "direct" trial, and see how they compare.

cheers -ben