Re: Typelib issue

"Igor Tandetnik" <>
Fri, 15 Aug 2008 08:02:28 -0400
"George" <> wrote in message

It is good to know new things from you. Sorry my English is not very
good. I mean using information in typelib file is better or accessing
instance vtable to achieve function pointer is better -- in essence,
Invoke of IDispatch is just a way to find function pointer and
passing parameters?

Like I said, if you want to know what IDispatch is for, there's copious
literature on the matter, and I'm pretty sure we have discussed this
before. I have nothing to add.

I think accessing vtable address directly is of better performance,

Better than what? Let's assume as a given that you need to implement
IDispatch::Invoke, say as part of a dual interface. So you have
something like this:

STDMETHODIMP MyObject::Invoke(DISPID dispid, DISPPARAMS* params, ...) {
    // XXX

What would you put in place of XXX ? Show me how you are going to
"access vtable address directly" from inside your Invoke implementation.
With best wishes,
    Igor Tandetnik

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