Re: [Chicken-users] c-callbacks

[Bastian Müller]

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Am 17.08.2007 um 22:56 schrieb Robin Lee Powell:

Hi,

> On Fri, Aug 17, 2007 at 10:34:46PM +0200, Bastian Müller wrote:
> > Finally, I tried to do the actual call.
> > First, I tried:
> >   (ode-space-collide space (null-pointer) foobar)
> > and during the simulation I got an
> >   Error: bad argument count - received -2 but expected 3: error in
> > error
> >   graphics.scm: 76   ode-space-collide    <--
>
> So you'll want #f instead of (null-pointer), and you'll want
> (location foobar), and foobar needs to be define-external *in the
> file you set the callback from*.
>
> The "bad argument count" thing is exactly what happens when you
> don't use (location func) for setting up a callback; it happened to
> me a bunch whilst making cluck.

so, I put the define-external in graphics.scm, where I do now:
 (ode-space-collide space #f (location foobar))

and throws again:

Error: (location) bad argument type - locative can not refer to  
objects of this type: #<procedure (foobar data81 geom182 geom283)>

I'm using chicken 2.6, btw.

Thanks for your quick response

- --
Bastian Müller - http://turbolent.com/

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