Re: guile-user Digest, Vol 216, Issue 19

[Tim Meehan <btmeehan@gmail.com>]

Hi Adriano, I hope you mean the int pointer example and not the GTK
example. I wasn't able to get the GTK example working.

The int pointer example worked like this:
// C code, compiled with:
// gcc stuff.c -o libstuff.so -fPIC -shared
void increment_intptr(int *a) { *a += 1; }

;; Guile source
(use-modules (system foreign)
    (rnrs bytevectors))

(define libstuff (dynamic-link "./libstuff.so"))

(define increment
    (pointer->procedure
        void
        (dynamic-func "increment_intptr" libstuff)
        (list '*)))

(let ([b (make-bytevector (sizeof int))])
    (display b)
    (newline)
    (increment (bytevector->pointer b))
    (display b)
    (newline))

On Wed, Nov 25, 2020 at 6:17 AM Adriano Peluso <randomlooser@riseup.net>
wrote:

> Il giorno mar, 24/11/2020 alle 15.26 -0600, Tim Meehan ha scritto:
> > Matt - thanks for the help making the FFI pointers work!
>
> Would you mind publishing the working version of your code ?
>
>
>
>