Re: Cannot implement SetSite for IObjectWithSiteImpl, get compiler error

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.atl

Date:

Wed, 23 Aug 2006 00:58:32 -0400

Message-ID:

<uDmFHDnxGHA.3568@TK2MSFTNGP03.phx.gbl>

"roland orlando" <parzifal22@gmail.com> wrote in message
news:1156308243.469476.221030@i3g2000cwc.googlegroups.com

However I get a compiler error when I do this.

error C2509: 'SetSite' : member function not declared in 'CBHO'

So, have you declared the method in CBHO class definition?

It's already declared with the automatically generated :

class ATL_NO_VTABLE CBHO :
public CComObjectRootEx<CComSingleThreadModel>,
public CComCoClass<CBHO, &CLSID_BHO>,
public IObjectWithSiteImpl<CBHO>,
public IDispatchImpl<IBHO, &IID_IBHO, &LIBID_BHELPERLib>
{

Just deriving from IObjectWithSiteImpl is not enough. You want to
override the method from the base class - you need to declare it in the
derived class. Consider:

class Base {
public:
    virtual void f() {}
};

class Derived : public Base {
public:
    void f(); // must have this
};

// Try this without the declaration above - you'll get the same error
void Derived::f() {
}

--
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