Using python ctypes invoke gtk_builder
Question: my python code is:

    
    
    gtk = CDLL('/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so')
    builder = gtk.gtk_builder_new()
    print gtk.gtk_builder_add_from_file(builder, './mainui.glade', None)
    

I tested the c code, it works. But with python ctype, the result of
gtk_builder_add_from_file is always 0, e.g there is an error. I'm very
confused..


Answer: Why don't you use the introspection feature? There is a reason it exists.

    
    
    from gi.repository import Gtk as gtk
    
    class Foo (object):
    
        def __init__(self):
            self.builder = gtk.Builder()
            self.builder.add_from_file("someui.glade")
            self.builder.connect_signals(self)
    
        def run(self, *args):
            self.builder.get_object("mainwindow").show()
            gtk.main()
    
        def quit(self, *args):
            gtk.main_quit()
    
    
    Foo().run()
    

* * *

if that is not an option, pass a `GError **` instead of none to get some more
information regarding the issue (might be in your `*.glade` file or missing
permissions)

