Re: Implement COM interface in managed C++.

From:
"Alexander Nickolov" <agnickolov@mvps.org>
Newsgroups:
microsoft.public.vc.atl
Date:
Mon, 22 May 2006 12:57:17 -0700
Message-ID:
<#Y0PundfGHA.1260@TK2MSFTNGP05.phx.gbl>
Well, the correct group for your question would be:

microsoft.public.dotnet.languages.vc

Also you are talking about Managed C++. Note this is deprecated.
You should be using C++/CLI in VS 2005 nowadays...

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

"krzys" <krzys@discussions.microsoft.com> wrote in message
news:83EE6F0F-8496-40B1-B6BD-9BDC97EACFDE@microsoft.com...

I had posted there, but didn't get any reponses.

It seems in C# one doesn't need to explicitly define any COM object, just
create an ordinary .NET interface like the one I included in my post, with
extra annotations that identify which COM interface it represents.

I was wondering how to achieve the same in MC++. Ideally, without even
having to manually define the .NET interface that represents the COM
interface, like in this C# example. After all, unlike in C#, in managed
C++
all such "original" COM interfaces are available for the programmer, for
the
unmanaged code.

So, is there a way to use those existing COM interfaces in MC++ in a
managed
class without the need for such managed wrappers like the one I attached
below in C#?

"Alexander Nickolov" wrote:

The right group would be:
microsoft.public.dotnet.framework.interop

I assume it's not any different from C# - you create a COM
Interop object implementing the COM interface to forward it to
your .NET object implementing a compatible .NET interface.
Of course I know next to nothing about .NET and COM
Interop, so don't quote me...

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

"krzys" <krzys@discussions.microsoft.com> wrote in message
news:724FF8D6-97D4-4576-9CE1-79410070B1CB@microsoft.com...

I'm posting here because I couldn't get any help in other managed
groups.

After hours of browsing I can't find any hints on how to implement a
COM
component using a managed C++ class.

In C# this is trivial, you import the interface like below and just
implement it.

In C++ neither inheriting such unmanaged interfaces nor adding the
IMPLEMENTS_INTERFACE sections appears to work. The documentation
doesn't
provide any clue.

How to achieve this in managed C++? I'd rather not use ATL or other
non-.NET
technologies unless absolutely necessary.

   [ComImport(), Guid("000214EA-0000-0000-C000-000000000046"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
   internal interface IPersistFolder
   {
       void GetClassID(ref Guid pClassID);
       [PreserveSig]
       long Initialize(IntPtr pidl);
   }

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