Re: Problem with VB -> C++ interface pointer
"spforeman" <firstname.lastname@example.org> wrote in message
STDMETHODIMP CFoo::ProcessSpot(ISpot *pAnalysisSpot)
CComObject<CSpot> *pSpot = 0;
hr = pAnalysisSpot->QueryInterface(IID_ISpot, (void **)&pSpot)
What exactly is that supposed to achieve? You query for IID_ISpot, you
get back ISpot* pointer, not CComObject<CSpot>. The net effect of this
call is the same as a simple cast:
CComObject<CSpot> *pSpot =
Do you see now why it won't work?
When I trace through the code I can step into the code where VB sets x
and y to be -1, but when ProcessSpot is stepped into and
QueryInterface is called pSpot has garbage in the x and y values.
pSpot pointer itself is garbage.
With best wishes,
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