putting glade interface in python

Question

I've made a gui in glade that I want to put in a python program. I was adapting the instructions from a tutorial I found online to load in my glade file (http://www.pygtk.org/articles/pygtk-glade-gui/Creating_a_GUI_using_PyGTK_and_Glade.htm). When I had problems I tried something basic (one button) calling it the same thing as in that tutorial, and copy pasting their code, and it still didn't work. I also took a look at (http://www.linuxjournal.com/article/6586?page=0,2), which has a function being called slightly differently ("self.wTree=gtk.glade.XML (gladefile,windowname)" instead of without windowname), and implemented an equivalent with mine and that didn't fix it. I definitely have pygtk working, I made something without using glade before and it worked fine. The error I'm getting is:

/usr/share/themes/NOX/gtk-2.0/gtkrc:233: Murrine configuration option "gradients" 
 is no longer supported and will be ignored.

(helloWorld.py:9804): libglade-WARNING **: Expected <glade-interface>.  Got    
 <interface>.

(helloWorld.py:9804): libglade-WARNING **: did not finish in PARSER_FINISH state
Traceback (most recent call last):
File "helloWorld.py", line 31, in <module>
hwg = HellowWorldGTK()
File "helloWorld.py", line 22, in __init__
self.wTree = gtk.glade.XML(self.gladefile) 
RuntimeError: could not create GladeXML object

I'm running xubuntu 11.04. The Murrine configuration thing comes up when any gtk application opens, but I included it in case it is relevant. Here's the code I took from the tutorial (but isn't working)

#!/usr/bin/env python

import sys
try:
    import pygtk
    pygtk.require("2.0")
except:
    pass
try:
    import gtk
    import gtk.glade
except:
    sys.exit(1)

class HellowWorldGTK:
"""This is an Hello World GTK application"""

def __init__(self):

    #Set the Glade file
    self.gladefile = "PyHelloWorld.glade"  
    self.wTree = gtk.glade.XML(self.gladefile) 

    #Get the Main Window, and connect the "destroy" event
    self.window = self.wTree.get_widget("MainWindow")
    self.window.show()
    if (self.window):
        self.window.connect("destroy", gtk.main_quit)


if __name__ == "__main__":
    hwg = HellowWorldGTK()
    gtk.main()

Answer 1

Try with this code:

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import pygtk
pygtk.require("2.0")
import gtk
import gtk.glade

class HellowWorldGTK:

    def __init__(self):
        self.gladefile = "helloworld.glade" 
        self.glade = gtk.Builder()
        self.glade.add_from_file(self.gladefile)
        self.glade.connect_signals(self)
        self.glade.get_object("MainWindow").show_all()

    def on_MainWindow_delete_event(self, widget, event):
        gtk.main_quit()

if __name__ == "__main__":
    try:
        a = HellowWorldGTK()
        gtk.main()
    except KeyboardInterrupt:
        pass

Remember: In Glade, Edit the "Preferences" of the file to "GTKBuilder" (not "libglade")

Answer 2

Your PyHelloWorld.glade is incorrect. Make sure you created it with the correct Glade application, there are Glade2 and Glade3 applications that can be installed and used. If you downloaded the file make sure it is correct. The error message says it all:

Expected <glade-interface>.  Got  <interface>

So the XML file has the interface tag, but PyGTK library expects glade-interface tag.