Re: Implementing an interface

From:

"Drew" <dam@dam.dam>

Newsgroups:

microsoft.public.vc.atl

Date:

Mon, 2 Jul 2007 13:25:22 -0500

Message-ID:

<#aXwbZNvHHA.3556@TK2MSFTNGP02.phx.gbl>

Normally, you have a small block of attribute information prior to the
interface declaration, as below:

[
  object,
  uuid("8529A338-0869-46dd-B3F5-08FD84D14C9D"),
  dual,
  oleautomation,
]
interface IMyInterface: public IUnknown
{
HRESULT MyMethod([in] BSTR bstrVal);
}

Drew

"SD" <SD@discussions.microsoft.com> wrote in message
news:100608F3-9F83-47F3-A081-1B33DB058508@microsoft.com...

Hi,

I have an interface in an IDL file, say:

interface IMyInterface: public IUnknown
{
HRESULT MyMethod([in] BSTR bstrVal);
}

I build the project containg the IDL file and it builds the necessary
files
(.tlb, etc.)

And I implement this interface in a class, in a .h file:

class MyClass : public IMyInterface
{
STDMETHOD (MyMethod) (/*[in]*/ BSTR bstrVal);
}

//Provide implementation in .cpp file.
--------------------------------------------------------

From another .cpp file I try to create an instance of this class

CComPtr<IMyInterface> pUVD;
hr = pUVD.CoCreateInstance(__uuidof(MyClass));

Here, I get an error saying there is no GUID associated with the class.
How do I rectify this?

TIA,
SD

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