Re: AtlMarshalPtrInProc return E_NOINTERFACE

"Vitalij Skrupskij" <>
Wed, 11 Jun 2008 15:46:01 +0300
    The thing is

    CComPtr<IB> pp;
    IStream *pStm;
    HRCHECK( CComObject<CMyClass>::CreateInstance(&p));
    HRCHECK(p->QueryInterface(IID_IB, (void**)&pp));
    HRESULT hRes = AtlMarshalPtrInProc(pp, IID_IB,&pStm);

doesn't work either. Everything is registered. What really makes me
frustrated is that marshaling works just fine for IC and IA and only fails
for IB even though all these interfaces are indentical
in every way

"Igor Tandetnik" <> wrote in message

"Vitalij Skrupskij" <> wrote in message

   CComPtr<IA> pp;
   IStream *pStm;
   HRCHECK( CComObject<CMyClass>::CreateInstance(&p));
   HRCHECK(p->QueryInterface(IID_IUnknown, (void**)&pp));

Why are you querying for IUnknown, but putting the result into IA pointer?
This is equivalent to a downcast, and is illegal in COM. Query for the
interface you actually want.

   HRESULT hRes = AtlMarshalPtrInProc(pp, IID_IB

Why are you passing IA pointer, but specify IID_IB? The two parameters
must match.

Have you built and registered proxy/stub DLL for your interfaces? Check in
the registry under HKCR\Interface\{Your IID}
With best wishes,
   Igor Tandetnik

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