Sending information to callback function GTK

This is a discussion on Sending information to callback function GTK within the C Programming forums, part of the General Programming Boards category; Hi! I started writing code in GTK+Glade and ... I stopped. I don't have idea how to send information to ...

  1. #1
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    Oct 2007
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    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

  2. #2
    and the Hat of Guessing tabstop's Avatar
    Join Date
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    14,185
    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.

  3. #3
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    Oct 2007
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    12

    callbacks

    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.

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