[cffi-devel] Defcallback calling into C

[Martin Simmons]

>>>>> On Tue, 25 Mar 2008 08:52:26 -0700, Luke J Crook said:
> Delivered-To: cffi-devel at common-lisp.net
> 
> Does DEFCALLBACK support calling back into C from the Lisp side? One of 
> the features of OpenRM is that it will call a callback when certain data 
> structures are freed internally by the C library (for example a node in 
> the scene graph, or vertex and color data shared between primitives 
> within nodes.) Complex structures require that the appropriate C 
> function is called.

I'm not quite sure what you are asking.  DEFCALLBACK defines a callback
function, so you need to use DEFCFUN to define a Lisp function that can call
into C.  Calling a function defined with DEFCFUN within the body of a
DEFCALLBACK should work.


> I am using CFFI version 0.9.2 from the Cliki and see the same error from 
> Lispworks and SBCL.

What is the error?  Can you get a backtrace?

__Martin