aggregation and atl problem?

From:
"GAK" <usfinecats@nospam.sbcglobal.net>
Newsgroups:
microsoft.public.vc.atl
Date:
Sat, 12 Apr 2008 17:36:31 -0700
Message-ID:
<#jzL05PnIHA.3940@TK2MSFTNGP05.phx.gbl>
I am having a bit of a problem with aggregating 2 atl classes CBaseOverlay
is the inner, COverlay0 is the Outer.

Everything seems to hook up ok, I can watch the creation of both classes but
when the client tries to find one of the interfaces implemented by the
inner, it fails.

class ATL_NO_VTABLE CBaseOverlay :
 public CComObjectRootEx<CComSingleThreadModel>,
 public CComCoClass<CBaseOverlay, &CLSID_BaseOverlay>,
 public IBaseOverlay,
 public IShellIconOverlayIdentifier {

.....
BEGIN_COM_MAP(CBaseOverlay)
 COM_INTERFACE_ENTRY(IBaseOverlay)
 COM_INTERFACE_ENTRY(IShellIconOverlayIdentifier)
END_COM_MAP()

}

for the outer

class ATL_NO_VTABLE COverlay0 :
 public CComObjectRootEx<CComSingleThreadModel>,
 public CComCoClass<COverlay0, &CLSID_Overlay0>,
 public IOverlay0
{
.....

BEGIN_COM_MAP(COverlay0)
 COM_INTERFACE_ENTRY(IOverlay0)
 COM_INTERFACE_ENTRY_AGGREGATE (IID_IBaseOverlay, ptrUnk)
END_COM_MAP()

 DECLARE_PROTECT_FINAL_CONSTRUCT()
 DECLARE_GET_CONTROLLING_UNKNOWN()
 IUnknown* ptrUnk;

 HRESULT FinalConstruct()
 {

    HRESULT Status = CoCreateInstance(CLSID_BaseOverlay,
GetControllingUnknown(),CLSCTX_ALL, IID_IUnknown, (void**)&ptrUnk);
    IBaseOverlay* pBO;
    ptrUnk->QueryInterface(IID_IBaseOverlay, (void**)&pBO);
    ((CBaseOverlay*)pBO)->IconIndex = 0;
    pBO->Release();
    return Status;
 }

 void FinalRelease()
 {
   ptrUnk->Release();
 }

.....
}

Any ideas what I'm missing?
--
Gak -
 Finecats

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