Re: Problems with callback functions...

[Laurent Sauvebois <Laurent Sauvebois ns mecalog fr>]

"Jeff W." wrote:

> How can I pass in my property box to this callback function so that I
> can call the gnome_property_box_changed() method and enable the "apply"
> button?  Thanks for your time.

Hi,

two solutions for you :

1/

gint callback(my_type *my_pointer)
{

}

called by

gtk_signal_connect_object(GTK_OBJECT(my_widget),"event",
GTK_SIGNAL_FUNC(callback),GTK_OBJECT(my_pointer));

This way, the cast is done as the callback function is called. it is a cast
from a pointer to a pointer, no pb.



2/

gint callback(GtlWidget *my_widget, GdkEvent *my_event, my_type *my_pointer)

{

}

called by

gtk_signal_connect(GTK_OBJECT(my_widget),"event", GTK_SIGNAL_FUNC(callback),
(gpointer)my_pointer );



Last point : to my mind, your error is not due to the cast, as a cast from
pointer to pointer would not crash. To my mind, your pointer is set to NULL
for some other reason. Check this before ....


Laurent