Using enums from other libraries as defaultvalues

From:

Stuart Redmann <DerTopper@web.de>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 21 Aug 2006 11:27:54 +0200

Message-ID:

<ecc1l9$7q7$1@news.dtag.de>

Hello newsgroup,

I want to use the enum values of a third-party type library as
defaultvalues for my own interface. Unfortunately, this seems not to
work. The code for the test looks like this:

[
    uuid(6A7B3B27-AE89-4255-8BEF-8B937FDD788B),
    version(1.0)
]
library TestBaseLibrary
{
   importlib("stdole32.tlb");
   importlib("stdole2.tlb");

   [
       uuid(E0AFC11A-EFB3-405c-9C18-47ABEF1E4292),
       v1_enum
   ]
   enum ETestEnum
   {
     TEST_IDENTIFIER = 0
   };
}

This library serves as a dummy for the third-party type library. If I
derive another library from this dummy library using the
importlib-directive, I can use the enum ETestEnum, but not its values:

[
    uuid(35D8801C-9E59-4388-BCBA-D9FA41A50572),
    version(1.0)
]
library TestDerivedLibrary
{
   importlib("TestBaseLibrary.tlb");

   [
       object,
       uuid(BED6D356-8546-482d-8F11-516BDBF43B72),
       pointer_default(unique)
   ]
   interface ITestInterface
   {
     [id(1)]
     HRESULT TestMethod
     (
       [in, defaultvalue(TEST_IDENTIFIER)] enum ETestEnum MyEnum
       // This yields the error message:
       // .\TestDerivedLibrary.idl(19) : error MIDL2035 :
       // constant expression expected
     );
   };
}

What am I doing wrong?

Thanks in advance,
Stuart