Howto initialize a private (not registred) interface?

jerker_back <>
Fri, 18 Jul 2008 05:29:36 -0700 (PDT)
Hello all,

My application is a plugin module (DLL) which loads a PDB file and
analyze it with the help of interfaces in Visual Studio DIA SDK
(msdia.dll). The plugin is implemented in ATL but is not a COM server
and it must not be (at least not registred). Using the DIA SDK
interfaces with smart pointers is no problem, but there is one
interface which is just a stub - IDiaLoadCallback2. So, this interface
must be implemented by the plugin. IDiaLoadCallback2 allows you to
control where to find the debug database. I did it as an ATL simple
object like this:

class ATL_NO_VTABLE CCallback :
    public ATL::CComObjectRootEx<ATL::CComSingleThreadModel>,
    public ATL::CComCoClass<CCallback, &__uuidof(IDiaLoadCallback2)>,
    public ISupportErrorInfo,
    public IDiaLoadCallback2
OBJECT_ENTRY_AUTO(__uuidof(IDiaLoadCallback2), CCallback)

The plugin start routine initialize the DIA SDK interfaces like this:

ATL::CComPtr<IDiaDataSource> m_pDiaDataSource;
hr = m_pDiaDataSource.CoCreateInstance(__uuidof(DiaSource), NULL,

=> hr = S_OK

CCallback* m_pCallback;
hr = m_pDiaDataSource->QueryInterface(__uuidof(IDiaLoadCallback2),

=> error: hr = E_NOINTERFACE

How to do this?
I don't want to register CCallback, just use it as a private

Jerker B=E4ck

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