Re: Basic question - GtkTreeviewForeachFunc

[David Nečas (Yeti) <yeti physics muni cz>]

On Wed, May 24, 2006 at 12:18:34PM -0300, John Coppens wrote:
> I'm trying to get this working:
>
> --------------- The function
> gboolean
> save_one_sat(GtkTreeModel *model, GtkTreePath *path, GtkTreeIter *iter,
>                 gpointer data)
> {
>   // do something
> }
>
> --------------- Is passed to another function like this:
>   satlist_foreach_sat(save_one_sat);
>
> --------------- This function is declared as:
> void            satlist_foreach_sat(GtkTreeModelForeachFunc func);    
>
> --------------- Where the actual GtkTreeModelForeach will be called:
>   gtk_tree_model_foreach(GTK_TREE_MODEL(sat_store), func, NULL);
>
>
> This segfaults, and gdb says the parameter passed to satlist_foreach_sat
> is actually 0x1, not the address of the save_one_sat function. I've tried
> declaring save_one_sat as static, I've typecasted the save_one_sat on
> passing it as parameter. I've found several tutorials on the net that did 
> just this...

Well, the few lines you posted seem correct.

Perhaps you overwrite stack (or have other memory problem)
elsewhere.  Note gdb does not always display on-stack
variable values right when optimizations are enabled (the
the stack space is probably reused for something else).

You can
- disable optimizations
- use plain fprintf(stderr, ...)
- find out whether func is really 0x1 when it is called and
  when it changes to this value
- try valgrind

Yeti


--
Anonyms eat their boogers.