Re: who could tell me?

"Igor Tandetnik" <>
Wed, 13 Jun 2007 07:57:48 -0400
"Lee Tow" <> wrote in message

    I create a COM using ATL,and it support dual,look:
STDMETHODIMP CAdd::sub(long n1, long n2, long *pVal)

v[0].vt = VT_I4; v[0].lVal = 3; // this is the second parameter
v[1].vt = VT_I4; v[1].lVal = 2; // this is the first parameter
I want to know why the v[0] is he second parameter,v[1] is the first

IDispatch::Invoke expects parameters in reverse order. The only
rationale I've seen for this is some vague hand-waving about it being
helpful for universal marshaller to marshal parameters more efficiently
(I can't imagine how it could possibly help though). Just accept it as a
fact of life, and move on.
With best wishes,
    Igor Tandetnik

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necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
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