Re: error MIDL2025 : syntax error : expecting { near ","
Well, it _is_ possible to insert intermediate implementation
classes, but one _has_to_ use templates for that... The following
COM FAQ articles detail the techniques involved and other
related ones:
http://vcfaq.mvps.org/com/7.htm
http://vcfaq.mvps.org/com/8.htm
I also wouldn't recomend it in OP's design though...
--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://vcfaq.mvps.org
=====================================
"Igor Tandetnik" <itandetnik@mvps.org> wrote in message
news:OMXoLDD5HHA.5164@TK2MSFTNGP05.phx.gbl...
Donos <donguy76@gmail.com> wrote:
What's CHonda and CToyota? Did you mean IHonda and IToyota? If so,
then yes, you should derive from both IHonda and IToyota but not from
ICar or IVehicle.
Actually the organization of code is a little different. I am just
using one CoClass for all Interfaces and then a COM MAP Entry inside
the header of that CoClass for all interfaces. And that is the
CVehicleCoClass.
What i did is,
class CHonda : public IHonda
{
};
..................................................
Like that, classes for all Interfaces.
You are trying to insert intermediate classes into an existing inheritance
hierarchy. That's not going to work. I strongly recommend that you
reconsider your design. Break the set of methods into interfaces in a way
that the interfaces can be implemented side by side, rather than deriving
one from another. You'll have nothing but trouble if you continue with
your current design.
So as per your suggestion i won't be deriving the CVehicleCoClass from
CVehicle and CCar as both are already inherited inside CHonda,
CToyota. Right?
Wrong. CHonda is derived from IHonda which is derived from ICar and
IVehicle. There is no CCar or CVehicle in this chain, and there's no way
to put them there.
I am pretty new to COM programming. I agree with you that this design
has its flaws.
That's probably the most charitable way to describe it.
--
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