Thank you, that did the trick.

Yeah I know about the strcpy issue....but I chose to ignore it in this
test program. In this particular case, the objective is to help me be
comfortable with callbacks and the GC which is not quite working as
yet...

Ronnie

On Thu, Feb 03, 2005 at 12:06:03PM +0100, Daniel B?nzli wrote:
> When you use CAMLparam and CAMLlocal macros you must return from your C 
> functions with CAMLreturn.
> 
> Also, beware of your use of strcpy with String_val(aString) according 
> to the documention caml strings can contain embedded null characters.
> 
> Daniel