[gme-users] MGAMeta: UsingDefinedFCOs

[Larry Howard]

Simon,

In general, casting is a good first step when you run into this kind  
of issue.  No guarantees, just a measure to ensure a particular  
interpretation of a returned COM pointer type.

So,

meta = win32com.client.gencache.GetModuleForProgID("Mga.MgaMetaFCOs")

rFCOs = project.RootMeta.RootFolder.DefinedFCOs
for rFCO in rFCOs:
    print meta.IMgaMetaFCO(rFCO).Name

works fine for me.

In searching over a large body of our Python code for GME, I find a  
significant amount of casting of Meta-related COM pointers.  This is  
merely an observation from experience, but it bears out the above  
guidance.

Regards,
lph
--
Larry Howard, Sr. Research Scientist
Institute for Software Integrated Systems, Vanderbilt University


On Mar 2, 2008, at 5:46 AM, Simon Görke wrote:

> Hello everybody,
>
> I have a problem accessing the FCOs of my Meta model from an  
> interpreter
> written in Python / COM.
>
> While a simple
>
> print project.RootMeta.RootFolder.DefinedFCOByName("MetaEntityName",  
> 1).Name
>
> works without problems, using
>
> rFCOs = project.RootMeta.RootFolder.DefinedFCOs
> print rFCOs.Count
> for rFCO in rFCOs:
>    print rFCO.Name
>
> is not successful. The number of meta entities returned by the  
> rFCOs.Count
> seems correct, however I am not able to actually access the FCOs  
> returned
> (Python gives me "AttributeError: <unknown>.Name").
> Within the interpreter, I have to access ALL Meta Entities without  
> knowing
> their names, so using the "DefinedFCOs" method seemed to be a good  
> idea to
> me.
>
> BTW: Using MGA Collections in general does not seem to be part of the
> problem, as the follwing code snippet is working:
>
> FCOs = project.RootFolder.ChildFCOs
> for FCO in FCOs:
>    print FCO.Name
>
> I really do not know how to go on on and wheather this issue results  
> from
> lack of understanding on my side or even a problem in the GME /  
> Python COM
> Interface?
> Any advice is highly appreciated!
>
> Thanks,
> Simon
>
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