Re: Help casting void pointer to GtkWidget

[Patrick <patrick spellingbeewinnars org>]

Hi Jasper

You were right, the error was in the construction of the button.

Thanks for your help, I am good to go now!

-Patrick




On 07/19/2015 04:09 PM, Jasper St. Pierre wrote:
> Well, you're passing something that isn't a GtkWidget to sig_con1. The
> type of the pointer should not matter as long as it points to a
> GtkWidget (some secret sauce under the hood is used to know whether
> it's a valid pointer or not).
>
> We would need to see what calls sig_con1 to debug further, but look there.
>
> On Sun, Jul 19, 2015 at 12:15 PM, Patrick
> <patrick spellingbeewinnars org> wrote:
> > Hi Everyone
> >
> > I am doing something strange. I am mixing C GTK and COBOL. It's GnuCOBOL and
> > it compiles to intermediate C.
> >
> > I can create widgets by creating pointers in COBOL and passing them to C GTK
> > functions and such but I can't seem to connect signals.
> >
> > This code:
> >
> > int sig_con1( GtkWidget * widget_id ) {
> >    g_signal_connect(G_OBJECT(widget_id),"clicked",
> > G_CALLBACK(handler1_to_handler2),NULL);
> > .....
> >
> >
> > compiles but when it runs I get :
> >
> > (anak:18978): GLib-GObject-WARNING **: invalid unclassed pointer in cast to
> > 'GObject'
> >
> > (anak:18978): GLib-GObject-WARNING **: instance with invalid (NULL) class
> > pointer
> >
> >
> > COBOL is actually passing in a void pointer so widget_id is actually type
> > void. I can't seem to cast it to a pointer to a G_OBJECT. Changing the
> > functions prototype to void * widget_id did not help.
> >
> > Could anyone give me a tip or two of how to cast ?
> >
> > Thanks-Patrick
> >
> >
> >
> >
> >
> >
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