[gambit-list] FFI and scheme-object

Hello all,

I'm trying to get my way around the FFI interface but I am a little lost.

I'm creating a list with scheme and I want to retrieve a piece of it from C, but I'm receiving a segfault.

I was looking around the examples from the distribution and I found (##still-copy), which made my code work, but I don't know why, and I couldn't find any mention of it inside the manual.

Here is my scheme code (foo.scm): ;;; (c-define (make-book title author) (char-string char-string) scheme-object "make_book" "" (list title author))

(c-define (get-title book) (scheme-object) char-string "get_title" "" (car book)) (c-define (get-author book) (scheme-object) char-string "get_author" "" (cadr book))

((c-lambda () void "f")) ;;;

And here is my C code (bar.c): /**/ #define ___VERSION 406001

#include <gambit.h>

void f() { ___SCMOBJ newbook = make_book("foo", "bar");

get_title(newbook); } /**/

I'm compiling with:

gsc -o baz -exe bar.c foo.scm