Re: Converting GdkEvent from C to Guile

[Marius Vollmer <mvo@zagadka.ping.de>]

Stephen Tell <tell@cs.unc.edu> writes:

> In guile-gtk 0.17, how do I convert a pointer to a GdkEvent (or
> GdkEventButton) to an SCM so it can be passed to a guile callback?

You use

    GdkEvent *ev;
    SCM val;

    extern sgtk_boxed_info sgtk_gdk_event_info;
    val = sgtk_boxed2scm (ev, &sgtk_gdk_event_info, copyp);

COPYP determines whether sgtk_boxed2scm will amke a copy of EV or not.
If you want guile-gtk to become owner of the GdkEvent structure
pointed to by EV (i.e guile-gtk can free it whenever it likes, using
gdk_event_free) you would use FALSE for COPYP.  When you want to stay
the owner of EV, say TRUE.  You should only say FALSE when EV is the
result of gdk_event_copy, as a rule.
 
- Marius

-- 
(let ((p #(78 91 29 77 90 51 71 91 86 24 54 55 119 16 104 62 42 58 121 80 10
124 48 102 79 22 12 116 27 34 37 100 16 83 115 40 126)))  (define (x n)  (do
((i 0 (1+ i))  (s 0 (+ s (* (vector-ref p i)  (expt n i)))))  ((= i 37) s)))
(do ((i 1 (1+ i))) ((= i 38)) (display (integer->char (modulo (x i) 127)))))