Hi Stephan,

Thanks for your answer, i found the booklet, but it was a draft, so it was incomplete. An example of FFIOpaqueObject would be healpful, i think.

Esteban already talked to me, and is helping me with this.

What do you mean with "Chipmunk existing bindings" ?.

2017-09-16 4:42 GMT-03:00 Stephane Ducasse <stepharo.self@gmail.com>:

Hi alvaro

Thanks for the question. If you have any suggestion for the booklet on
UFFI let us know.
I will let esteban anwser because I do not know.
BTW did you check the chipmunk existing bindings?

Stef

On Fri, Sep 15, 2017 at 3:42 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.
> Any suggestion?
> Thanks in advance.
>
> Alvaro Piorno