Re: MIDL or C++ interface ?

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From: Alessandro Angeli [MVP::DigitalMedia] (nobody_at_nowhere.in.the.net)
Date: 03/01/05 

Date: Tue, 1 Mar 2005 08:51:16 +0100

The March Hare [MVP] wrote:

>> The only reason I use IDL is for the type library. I'm
>> not a particular fan of VB, but there are plenty of
>> people who use VB with DirectShow via the tools on my
>> site. Using an IDL plus a few bits and pieces of glue
>> makes it pretty easy to enable VB access to your custom
>> interface.
>
> A very good point and one I wasn't aware of. Thanks for
> educating me (again).

This use is what I mentioned in my post (VB is an automation
client) however I still fail to see what use it is for a DS
filter, since the supplied automation wrapper for DS does
not provide any direct access to the filters but for the
IFilterInfo.Filter property, which however returns a
non-automation compatible IBaseFilter as an IUnknown, or is
it possible in VB to cast (QI) this reference to some other
IDispatch-derived interface implemented by the object? 

-- 
// Alessandro Angeli
// MVP :: Digital Media
// a dot angeli at psynet dot net

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