On Dec 1, 2008, at 8:58 AM, Arthur Gouveia wrote:

>  Hi folks!
> 
>  I´m trying to make a PytXPCOM + XUL  + Storm(ORM) app.
> 
>  The problem I´m having is that when I declare a component (Python  
>  Class)
>  without using (object), the PyXPCOM registers it just fine, but when  
>  I use
>  (object), or when I say the class inherits from a class that inhetis  
>  object,
>  on my Class declaration, the pyxpcom doesn't register it.
> 
> 
>  *I need to use the (object) on my component because Storm throws an  
>  __mro__
>  Error if I don´t, when doing a select on my DB.*
> 
>  What's happening? Anyone here saw this before and came up with a  
>  solution?
>  What is the problem on using (object) on pyxpcom components?

Hi Arthur,
You diagnosed this correctly. PyXPCOM components must be "old-style"  
classes; i.e. they cannot inherit from object. As you said, the  
symptom is that one's class is simply not registered. I remember that  
this took me a long time to debug.

I don't know why this limitation exists, but I guess it is due to some  
of the assumptions made in the PyXPCOM code.

I don't know of a workaround except to restructure one's code.

Good luck
Philip



> 
> 
> 
>  This code doesn´t register prCustomer (or customer), but if I declare
>  "prCustomer:", it registers just fine.
> 
>  *# -*- coding: UTF-8 -*-
>  # vim: set ts=4 sw=4 :
> 
>  from xpcom import components
> 
>  class Customer(object):
>         pass
> 
>  class prCustomer(Customer):
>         _com_interfaces_ = components.interfaces.prICustomerService
>         _reg_clsid_ = "{aac45fb0-9ead-11dd-ad8b-0800200c9a66}"
>         _reg_contractid_ = "@taturana.net/testes/customer;1"
> 
>         def add(self, cust):
>               pass
>  *
> 
> 
>  -- 
>  Arthur Gouveia.
>  Bacharelando em Ciências da Computação - Unipê
>  http://arthurgouveia.com
> 
>  "De nihilo nihilum."
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