Re: passing #define'd value to callback

[Peter Wurmsdobler <peter wurmsdobler ctm-france com>]

Darin,

> The technique definitely works; I have done it many times and seen it many
> places throughout the Gtk code too. It seems you have some other bug if you
> got a segmentation fault. The fact that GINT_TO_POINTER(0) is the same as
> NULL is irrelevant. Nothing tries to dereference the pointer.
Not really, it's not a bug it's a feature, because I set a variable
in shm to be the data. Seg fault. Now its clear. What really happens:

common.h:
#define ON  (1)
#define OFF (0)

xmcm.c:
static int on  = ON;
static int off = OFF;
void mm_spin_radiobutton_clicked( GtkButton *button,
    gpointer data )
    {
    if ( GTK_TOGGLE_BUTTON(button)->active )
        shm->mm_spin = *((int *)(data));
    }
gtk_signal_connect( 
    GTK_OBJECT( mm_on_radiobutton ), "clicked",
    GTK_SIGNAL_FUNC( mm_state_radiobutton_clicked ), &on );
gtk_signal_connect( 
    GTK_OBJECT( mm_off_radiobutton ), "clicked",
    GTK_SIGNAL_FUNC( mm_state_radiobutton_clicked ), &off );

rt_mcm.c:
if ( shm->mm_state == ON )
    pthread_make_periodic_np( rt_mcm_mm_control_thread, 
        start_time, MM_CONTROL_TS );

This code works but is not too elegant. So I was looking
for something simpler.
peterw
-- 
Dr. Peter Wurmsdobler

      CTM - Centre de Transfert des Microtechniques
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         E-mail: peter wurmsdobler ctm-france com

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