Re: How to create automation project with ATL

From:
Faisal <faisalm83@gmail.com>
Newsgroups:
microsoft.public.vc.atl
Date:
Fri, 7 Nov 2008 00:55:31 -0800 (PST)
Message-ID:
<1dcbfc41-314d-4aed-ac04-993346aee848@c2g2000pra.googlegroups.com>
On Nov 6, 10:55 pm, "Igor Tandetnik" <itandet...@mvps.org> wrote:

Faisal <faisal...@gmail.com> wrote:

[
uuid(56333924-493D-4009-BC68-3A6FE8B4CC9A),
helpstring("Math Class")
]
coclass Math
{
[default] interface IArithemetic;
interface ICompare;
};
};


Show the declaration of your Math coclass in C++, including the
interface map.

Unless you do certain extra work, it is illegal for a coclass to
implement more than one dual interface.
--
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


My coclass declaration

class ATL_NO_VTABLE CMath :
    public CComObjectRootEx<CComSingleThreadModel>,
    public CComCoClass<CMath, &CLSID_Math>,
    public IDispatchImpl<IArithemetic, &IID_IArithemetic,
&LIBID_MATHSLib>,
    public IDispatchImpl<ICompare, &IID_ICompare, &LIBID_MATHSLib>
{
public:
    CMath()
    {

    }

DECLARE_REGISTRY_RESOURCEID(IDR_MATH)

DECLARE_PROTECT_FINAL_CONSTRUCT()

BEGIN_COM_MAP(CMath)
    COM_INTERFACE_ENTRY(IArithemetic)
    COM_INTERFACE_ENTRY(ICompare)
END_COM_MAP()

// IArithemetic
public:
    STDMETHOD(Product)(/*[in]*/ long X, /*[in]*/ long Y, /
*[out,retval]*/ long *Result);
    STDMETHOD(Sum)(/*[int]*/ long X, /*[in]*/ long Y, /*[out,retval]*/
long *Result);
    STDMETHOD(Max)(/*[int]*/ long X, /*[in]*/ long Y, /*[out,retval]*/
long *Result);
};

BTW, what is this dual interface?

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