Re: Persisting data to the registry

From:

"Alexander Nickolov" <agnickolov@mvps.org>

Newsgroups:

microsoft.public.vc.atl

Date:

Tue, 26 Jun 2007 09:55:08 -0700

Message-ID:

<#W3kBLBuHHA.5028@TK2MSFTNGP02.phx.gbl>

Make sure you derive publicly from your interface. The message
complains about you having forgotten to put the public keyword in
your derivation.

--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://vcfaq.mvps.org
=====================================

"John" <John@discussions.microsoft.com> wrote in message
news:A8A21CAA-10B5-4365-8792-8A6C9C5823C0@microsoft.com...

Thanks Igor,

That was in fact the problem my implementation code didn't derive from
IPersistRegistry.

But now when I compile I get the following error;

error C2243: 'static_cast' : conversion from 'CSomeObject::_ComMapClass *'
to 'IPersistRegistry *' exists, but is inaccessible

Both the Load and Save methods are declared as public.

Any ideas?

"Igor Tandetnik" wrote:

John <John@discussions.microsoft.com> wrote:

I then added the interface to my objects com map;
BEGIN_COM_MAP(CSomeObject)
COM_INTERFACE_ENTRY(IPersistRegistry)
END_COM_MAP()

And finally the implementation template class to my object;

class ATL_NO_VTABLE CSomeObject:
...
...
public IPersistRegistryImpl<CSomeObject>

Now when I compile I get the following displayed

error C2078: too many initializers
error C2440: 'initializing' : cannot convert from
'ATL::_ATL_CREATORARGFUNC (__stdcall *)' to 'DWORD_PTR'
error C2440: 'static_cast' : cannot convert from
'CSomeObject::_ComMapClass *' to 'IPersistRegistry *'

The error message suggests that IPersistRegistryImpl, and hence
CSomeObject, does not in fact derive from IPersistRegistry.
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925