[python-win32] How to create a com_record?

[Kevin Patterson]

I found the comtypes equivalent if that helps any. The generated comtypes
file looks like this:

   COMMETHOD([dispid(1610743812), helpstring(u'GetInterface() method')],
HRESULT, 'GetInterface',
              ( ['in'], POINTER(GUID), 'riid' ),
              ( ['retval', 'out'], POINTER(POINTER(IUnknown)), 'ppUnknown'
)),

With the above, I'm able to use the comtypes.GUID.GUID structure to pass the
information over through the COM. Unfortunately I still can't find the
win32com equivalent of passing my structure through the COM.

The win32com generated py file is saying that it expects a VT_RECORD, but
from above, maybe it should really be expecting a POINTER ? or VT_POINTER ?
I tried to modify the win32com generated file to take a VT_PTR but that
didn't seem to help. I really don't want to redo my infastructure in
comtypes, so if anyone knows the win32com equivalent, that would be awesome.

In the meantime, I'll keep digging, and will post if I find more.


On Tue, Mar 11, 2008 at 12:58 PM, Kevin Patterson <patter001 at gmail.com>
wrote:

> Old thread, but I got a little more data on the function. The function
> actually has a REFIID as the first parameter. This apparently is a standard
> structure for C COM code.  I'm not entirely sure why the win32com changes
> the REFIID to be a VT_RECORD. Does the following definition of the functions
> help at all (they are from the IDL file)
>
> HRESULT GetInterface( [in] REFIID riid, [out, retval, iid_is(riid)]
> IUnknown** ppUnknown);
> should be same as:
> HRESULT GetInterface( [in] GUID* pGuid, [out, retval, iid_is(pGuid)]
> IUnknown** ppUnknown);
>
>
>
> On Mon, Feb 4, 2008 at 6:44 PM, Mark Hammond <mhammond at skippinet.com.au>
> wrote:
>
> > > guid = win32com.client.Record("GUID", some_ob)
> >
> > > I don't have the some_obj that allows me to build "GUID".
> >
> > It should be any object from the same typelib - almost certainly
> > whatever
> > object you intend passing this record to.
> >
> > > VB.NET (GetType) and C++ (__uuid) both already know that a GUID is a
> > record.
> >
> > C++ doesn't know it is a COM record.  A COM record is something quite
> > different to a C/C++ struct or from .NET types.  A COM record is
> > specifically designed to be cross-language.
> >
> > > It seems the python CLSID is the same thing, but i don't know what to
> > call
> >
> > > to get a CLSID that is a com_record type.
> >
> > As I've explained, we are looking for the COM record definition you are
> > trying to use.  A C++ struct definition for a GUID is *not* what you are
> > looking for - you are looking for the COM record definition of a GUID.
> >  I
> > see now that you simply copied me a C++ struct you found, which is not
> > at
> > all useful in this context.
> >
> > To clarify: in a *typelib* you will find a struct definition that you
> > are
> > trying to use.  Finding a struct definition of the same name somewhere
> > else
> > is not suitable.
> >
> > > Am I understanding the win32com.client.Record call correctly? It needs
> > GUID to be defined by the
> > > COM right?
> >
> > Not "defined by COM", but "defined using COM" - the author of a typelib
> > must
> > have defined it somewhere.
> >
> > > Its odd b/c the GIUD (python's CLSID) is all over the COM definitions
> > its
> > just type
> > > VT_RECORD type that I'm not understanding how to convert to.
> >
> > Yes, I'm afraid you are confused.  All existing GUID or CLSID
> > definitions
> > you can find are useless - there is only 1 that is relevant, and that
> > will
> > be defined in a typelib.
> >
> > I think the confusion is such that you need to find basic docs for the
> > object, so we can get back to square 1.
> >
> > Mark
> >
> >
>
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