Thread: Sending information to callback function GTK

Hi!

I started writing code in GTK+Glade and ... I stopped.
I don't have idea how to send information to callback function.
Mainly in GTK the is only one place to send variables to callback function for ex:

Code:

 gtk_signal_connect(object,name,func,func_data)

But trough func_data I can send only one variable. I can also other information send as global variable, but probably all my variable would be global ;-).

I attached my example. Would be great if somebody show me how to do this different way.
I am asking about generally idea how to connect and send information to callback function and programing with GTK-Glade.
Somehow is possible connect and declare sending data_func in Glade ?

main.c

Code:

....
GtkWidget *glowne_okno = NULL;
....
int main(int argc, char **argv)
{
    GladeXML *gxml;

    gtk_init(&argc, &argv);

    gxml = glade_xml_new("project1.glade", NULL, NULL);

    glowne_okno = glade_xml_get_widget(gxml, "glowne_okienko_programu");

    glade_xml_signal_autoconnect(gxml);

    gtk_main();
...

callbacks.h

Code:

...
extern GtkWidget *glowne_okno;
 
G_MODULE_EXPORT int on_zamkniecie_programu_activate (GtkWidget *widget, gpointer *data);

....

callbacks.c

Code:

......
G_MODULE_EXPORT int on_zamkniecie_programu_activate (GtkWidget *widget, gpointer *data)                    
{
   gint result = GTK_RESPONSE_YES;

   GtkWidget *dialog = gtk_message_dialog_new ( GTK_WINDOW (glowne_okno),GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_WARNING,
	    GTK_BUTTONS_YES_NO,("DO You wat to Quit?"));
	result = gtk_dialog_run (GTK_DIALOG (dialog));
	gtk_widget_destroy (dialog);
    
    if (result == GTK_RESPONSE_YES)
    {
    gtk_main_quit ();
    return (FALSE);
    }
};
....

Thanks in advance

Daniel

I don't know anything about GTK, but if I was only allowed one variable, I'd make it a pointer to a struct. Looking through the web, it looks like that gpointer is just a typedef for (void *), so you can have a pointer to anything you want in that last argument.

Thanks for tips.
I also found inforamtion about function: lookup_widget() or glade_get_widget_tree (GTK_WIDGET (....));
It means I can find pointers to other wigets in window and use them.
Next question is hot to use in callback function other data in my prog.