Re: About variant

"Igor Tandetnik" <>
Sun, 30 Dec 2007 08:37:35 -0500
"sawer" <> wrote in message

Oleautomation compatible types list contains :
VARIANT_BOOL, double, float, long, short, BSTR, DATE, IDispatch*,

because VARIANT support these. But why do they add VARIANT type to
that list. Isn't VARIANT wrapper for that types? Why does vartype
include VARIANT? Are there 2 types of VARIANT?

A VARIANT may refer to another VARIANT. The referring variant is set to
the type (VT_VARIANT | VT_BYREF) and its pvarVal member points to the
second variant. Only one level of indirection is allowed. This is used
to pass [out] and [in, out] parameters through IDispatch::Invoke
With best wishes,
    Igor Tandetnik

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