[IronPython] -X:PreferComDispatch

[Martin]

This might be a stupid question but does all this have any effect on
the number of python standard libraries supported by IronPython.

Reason I'm asking if IronPython doesn't require interop assemblies to
access COM objects then the issue of supporting pythong standard
libraries become atleast less of an issue?

On 10/2/07, Dino Viehland <dinov at exchange.microsoft.com> wrote:
> I pinged the dev who's been working on this (he's actually on another team), here's the response I got:
>
> We have not done comprehensive performance tests to find out differences between the two. Some time ago I tried to put a timer into test_cominterop.py where it iterated through an Excel 20x20 table and set values to it. In this test IDispatch-based calls turned out to be a bit faster.
>
> Which of the two is better? IDispatch based implementation requires TypeLibs, while the other approach would need to have Interop Assemblies deployed. So, from this perspective IDispatch-based option is more flexible (although there is still a long road to have full fidelity between the two).
>
> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Lee Culver
> Sent: Tuesday, October 02, 2007 9:55 AM
> To: Discussion of IronPython
> Subject: Re: [IronPython] -X:PreferComDispatch
>
> Interesting.  Which of the two is "better"?  Is there a performance tradeoff turning it on or off with COM objects which do or do not implement IDispatch?
>
> Thanks,
> -Lee
>
> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Dino Viehland
> Sent: Tuesday, October 02, 2007 8:56 AM
> To: Discussion of IronPython
> Subject: Re: [IronPython] -X:PreferComDispatch
>
> This enables using new support for COM objects that uses COM's IDispatch interface instead of trying to get a TypeInfo for the object and use that to invoke it.  With it enabled we'll first check for IDispatch then to see if we can get the TypeInfo, w/o it we'll check for the TypeInfo (via IProvideClassInfo or via IDispatch) and then try IDispatch if that fails.
>
> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Martin
> Sent: Tuesday, October 02, 2007 7:35 AM
> To: Discussion of IronPython
> Subject: [IronPython] -X:PreferComDispatch
>
> Hi,
>
> Can anyone eleaborate a bit more on the -X:PreferComDispatch option?
>
> Does it mean extended support for standard libraries? What does the
> prefer part stand for as in prefer com over what?
>
> BR
> Martin
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