Re: [Orbit-python-list] (in Object obj) marshalling error

[Roland M. <ma...@ec...>]

Christian Robottom Reis (2001-01-22 22:24:31 -0200) :

> Using orbit-python (no idea if we're getting a Orbit error, however) and a
> simple 
> 
> interface NamingObject {
>         void bind(in Object obj);
> };
> 
> interface, I have the following issues:
> 
> 1) Calling bind with a simple object reference:
> 
> [...]
> class Foo:
> 	pass
> a=Foo()
> nc.bind(a)
> 
> TypeError: Failed to marshal: Object Reference ()
> 
> even though a _is_ an object reference.

  Hm.  Is is a Python object reference, I'm not sure it's a CORBA
object reference.

> 2) Didn't work? Ok, let's try a stringified IOR:
> 
> nc.bind(orb.object_to_string(a))
> 
> CORBA.SystemException: IDL:CORBA/MARSHAL:1.0: IDL:CORBA/MARSHAL:1.0
> 
> Hmm. I wonder why I get a different message?

  For the same reason.  a is not of a type known by ORBit.

> 3) Let's do something dumb now:
> 
> nc.bind(1)
> 
> TypeError: Failed to marshal: Object Reference ()

  Same again.

  You can only marshal objects that are defined in a CORBA interface.

You should add an interface like:

interface Foo {
  attribute string bar ;
} ;

  Then you need to make your Python Foo class a subclass of
Your_module__POA.Foo: 

class Foo (Your_module__POA.Foo):
  def __init__ (self):
    self.bar = "Initial string"

  Only then will ORBit-Python know how to marshal your Foo objects.

> 4) And what about
> 
> nc.bind(orb.object_to_string(1))
> 
> Segmentation fault
> 
> Hmm, boom. Orbit-python or plain Orbit?

  That's a tricky question, and a nasty bug anyway.  I'll try to have
a look sometime.

> The practical effect of this is that it's impossible to use
> orbit-python with the Orbit nameserver as of now.

  I'm not so sure.  It's not like I have done it, but I would be more
convinced if you could retry with CORBA objects.

> We simply can't bind the servers to names because bind() takes an
> object parameter.

  Yep.  A CORBA object, not a Python object.

Roland.
-- 
Roland Mas

Et c'est tellement plus mignon de se faire traiter de con en chanson...
  -- in En chantant (Michel Sardou)