[Python.NET] AttributeError: 'MarshalByRefObject' object has
Richard.Martin at thomson.net
Tue Dec 28 22:59:04 CET 2004
Thanks for the fast reply. The pseudo-cast did it. I'd wonder why
trying Itoy() gave complaints about needing an argument.
From: Brian Lloyd [mailto:brian at zope.com]
Sent: Tuesday, December 28, 2004 1:13 PM
To: Martin Richard; pythondotnet at python.org
Subject: RE: [Python.NET] AttributeError: 'MarshalByRefObject' object
has noattribute ...
Hi Martin -
Interface types, as they appear to Python, all have a single argument
constructor that you can use to "cast" an object to
a particular interface.
Because System.Activator.GetObject() has a return type of
object, the runtime returns the object as its true runtime
type to Python (which happens to be MarshalByRefObject).
So I think all you need to do is an "explicit cast":
remoteObj = System.Activator.GetObject(IToy, url)
mytoy = IToy(remoteObj)
Hope this helps,
Brian Lloyd brian at zope.com
V.P. Engineering 540.361.1716
Zope Corporation http://www.zope.com
> -----Original Message-----
> From: pythondotnet-bounces+brian=zope.com at python.org
> [mailto:pythondotnet-bounces+brian=zope.com at python.org]On Behalf Of
> Martin Richard
> Sent: Tuesday, December 28, 2004 3:57 PM
> To: pythondotnet at python.org
> Subject: [Python.NET] AttributeError: 'MarshalByRefObject' object has
> noattribute ...
> This is python 2.3.
> I start a toy .NET service. This is a C-sharp executable.
> In the C-sharp files, this code exists:
> namespace foo
> public class Toy : MarshalByRefObject, IToy
> In python, after loading an assembly, I can successfully do either:
> from CLR.foo import Toy
> from CLR.foo import IToy
> I can get a string for the url of the service from the config file.
> I then try:
> # using Toy also gives the same result
> remoteObj = System.Activator.GetObject(IToy, url)
> and it returns this for remoteObj:
> <CLR.System.MarshalByRefObject object at 0x0090D090>
> If I try to invoke a method on remoteObj, I get this error:
> AttributeError: 'MarshalByRefObject' object has no attribute
> It is almost as if the remoteObj has not been cast to the correct type
> (Itoy). But if I do remoteObj.ToString() it returns 'foo.Toy'.
> If I just try to instantiate a local instance of Toy --
> t = Toy()
> -- this succeeds, and I can successfully invoke the method that fails
> on the remoteObj.
> Any ideas why the remoteObj is failing?
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