Re: Creating an object an an output parameter

"Igor Tandetnik" <>
Thu, 26 Jul 2007 11:15:39 -0400
John <> wrote:

STDMETHODIMP CSomeObj::Extract(RECT roi, ISomeObj** pSomeObjOut)
CComObject<CSomeObj>* pSomeObj = 0;
pSomeObj ->AddRef();
hr = pSomeObj->QueryInterface(&pSomeObjOut);

Should be

hr = pSomeObj->QueryInterface(pSomeObjOut);

(no ampersand).

pSomeObj ->Release();
return hr;

And here is the code that calls the method, and when it returns
pNewSomeObj is NULL. I don't know if it's because I'm using a smart
pointer and it goes out
of scope.

RECT roi;
CComPtr<ISomeObj> pNewSomeObj;
HRESULT hr = pSomeObj->ExtractROI(roi, &pNewSomeObj);

You seem to be calling a different method, not the one you've
implemented. What's the connection between ExtractROI and Extract?
With best wishes,
    Igor Tandetnik

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