On Mon, Sep 18, 2017 at 12:01 AM, alvaro piorno
<alvaropiorno...@gmail.com> wrote:
> Pierce: I already see the repo, i kwnow now the difference and is not the
> problem i have now. I made the suggestion for book draft i found, because
> theres is no example on it. Thanks for answer.
>
> Stephan : Yes, as Esteban said i´m using that, I´m extending (or trying)
> Esteban´s project. And i´m having the problem that esteban metioned. Thanks
> for answer.
>
> Ben: I have in C the same example as in Pharo using the physics of Chipmunk,
> and in C is working fine, there is a problem in the call to the function
> from Pharo in 64 bits. Thanks for answer.
Replicating the same example in C was not my point.
You'd said you'd already done that ;)
I meant compile your own shared C library containing...
cpBody* myBodyNew(cpFloat m, cpFloat i))
{
printf( "....\n", m, i );
cpBodyNew(cpFloat m, cpFloat i);
}
and from Smalltalk use...
self ffiCall: #(cpBody* myBodyNew(cpFloat m, cpFloat i))
also changing your existing C example to also use myBodyNew()
to confirm it works as expected.
cheers -ben
>
>
> 2017-09-17 12:11 GMT-03:00 Ben Coman <b...@openinworld.com>:
>>
>>
>> On Fri, Sep 15, 2017 at 9:42 PM, alvaro piorno <alvaropiorno...@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
>>
>
