[Chicken-users] C callback with SWIG

[Bastian Müller]

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Hi,

after getting the C callback to work with the normal C interface method
I got stuck and tired of doing this all by hand. I saw that gtk-2 and
wx-chicken both use SWIG. So I wrote a simple ode.i, included all header
files, gave it a shot and it works pretty well.

The only problem I have, are the C callbacks. I looked into the gtk-2  
egg
and saw that they just use normal functions or lambdas and don't do any
special voodoo.

Definitions:
// GTK
typedef void  (*GCallback) (void);
// ODE
typedef void dNearCallback (void *data, dGeomID o1, dGeomID o2);

// GTK
gulong g_signal_connect_data (gpointer instance, const gchar    
*detailed_signal, GCallback    c_handler,
                 gpointer data, GClosureNotify destroy_data,  
GConnectFlags connect_flags);
// ODE
void dSpaceCollide (dSpaceID space, void *data, dNearCallback  
*callback);

Call:
// GTK
(g-signal-connect *window* "destroy" (lambda () ... ))

// ODE
(ode-space-collide space #f (lambda (foo bar baz) ... ))

The gtk one works, my try with ode results in an:
Error: Type error in argument #3: expected void (*)(void *,struct  
dxGeom *,struct dxGeom *)|dNearCallback *: "bad argument type"

Anonymous functions and even normal ones don't work. How can I get  
this to work?

Thanks in advance!

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


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