Re: Creating an object an an output parameter

"Igor Tandetnik" <>
Wed, 25 Jul 2007 15:17:39 -0400
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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