Re: How to fix awkward ATL namespace clash?

Hi all

I'm porting some legacy COM/ATL projects to Visual Studio 2008. These
projects build in Visual Studio.NET 2003 without a hitch.

But now, in VS2008, I'm getting a namespace clash with my own IAccessor
interface which is already defined in the SDK header, oledb.h. My project
has a type library that declares its own IAccessor.

What is the best way for me to fix this? Many thanks for any help,
because
I'm pretty stuck now.

Here is the compiler error, my C++ header and the appropriate chunk of
IDL.

Compiler failure:
------------------------------------------------------------
c:\proj\vvdb\accessor.h(35) : error C2440: 'static_cast' : cannot convert
from 'CAccessor::_ComMapClass *' to 'IDispatch *'
       Types pointed to are unrelated; conversion requires
reinterpret_cast, C-style cast or function-style cast
c:\proj\vvdb\accessor.h(35) : error C2440: 'initializing' : cannot convert
from 'ATL::_ATL_CREATORARGFUNC (__stdcall *)' to 'DWORD_PTR'
       There is no context in which this conversion is possible
------------------------------------------------------------

Accessor.h
------------------------------------------------------------
#import "VVDb.tlb"

/////////////////////////////////////////////////////////////////////////////
// CAccessor
//class CVDbLocation;
class ATL_NO_VTABLE CAccessor :
   public CComObjectRootEx<CComMultiThreadModel>,
   public CComCoClass<CAccessor, &CLSID_Accessor>,
   public IDispatchImpl<IAccessor, &IID_IAccessor, &LIBID_VVDBLib, 1, 1>
{
public:
   CAccessor();
   ~CAccessor();

DECLARE_REGISTRY_RESOURCEID(IDR_ACCESSOR)
DECLARE_CLASSFACTORY_SINGLETON(CAccessor)

DECLARE_PROTECT_FINAL_CONSTRUCT()

BEGIN_COM_MAP(CAccessor)
   COM_INTERFACE_ENTRY(IAccessor)
   COM_INTERFACE_ENTRY(IDispatch) // <-- compiler complains about this
END_COM_MAP()

. . .
------------------------------------------------------------

VVDb.idl
------------------------------------------------------------
import "oaidl.idl";
import "ocidl.idl";
   [
       object,
       uuid(57C6D12E-3210-11D4-BF3C-00A0CC511FBA),
       dual,
       helpstring("IAccessor Interface"),
       pointer_default(unique)
   ]
   interface IAccessor : IDispatch
   { ... };
   ...
[
   uuid(57C6D121-3210-11D4-BF3C-00A0CC511FBA),
   version(1.1),
   helpstring("VVDb 1.1 Type Library")
]
library VVDBLib
{
   importlib("stdole32.tlb");
   importlib("stdole2.tlb");

   [
       uuid(57C6D12F-3210-11D4-BF3C-00A0CC511FBA),
       helpstring("Accessor Class")
   ]
   coclass Accessor
   {
       [default] interface IAccessor;
   };
};
------------------------------------------------------------