Re: How to handle classes in a ATL interface

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.atl

Date:

Tue, 25 Sep 2007 11:17:31 -0400

Message-ID:

<OghGyc4$HHA.748@TK2MSFTNGP04.phx.gbl>

Martin.Salo@gmx.net wrote:

This function should give a Person back:
STDMETHODIMP CAtlCompany::GetCustomer(IAtlPerson** Customer) {
CAtlPerson *oAtlPerson=0; // CAtlPerson is the wrapper for CPerson
oAtlPerson = new CAtlPerson(); // Create a new Wrapper.
CPerson oPerson=0; // This is the unchangeable C++ object.
oPerson = m_oCompany.GetPerson(); // Get the person from C++
oAtlPerson.SetObj(oPerson); // Fill the person into the Wrapper.
*Customer = oAtlPerson; // Return the wrapper.

return S_OK;
}
The problem is that CAtlPerson is abstract and cannot be instansiated.

Why is it abstract? Why don't you implement the methods you need to
implement?

The ATL part should allow this in VBA
Function TestAbc()
  Dim Customer As Person
  Dim MyCompany As Company

  Call Customer.SetName("Emil Maier")

Customer variable is set to Nothing at this point, as far as I can tell.
How and where do you actually create a Person object?
--
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