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Q223165: FIX: GetIDsOfNames( ) Returns DISP_E_UNKNOWNNAME for Named Args

Article: Q223165
Product(s): Microsoft C Compiler
Version(s): WINDOWS:3.0
Operating System(s): 
Keyword(s): kbservicepack kbActiveX kbAutomation kbCOMt kbVC600bug kbATL300 kbATL300bug kbATL300fix
Last Modified: 28-JUN-2001

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The information in this article applies to:

- The Microsoft Active Template Library (ATL) 3.0, included with:
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 6.0 
   - Microsoft Visual C++, 32-bit Professional Edition, version 6.0 
   - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
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SYMPTOMS
========

When calling IDispatch::GetIDsOfNames() for an ATL server and named arguments
are passed in, you receive the following error:

  0x80020006 (DISP_E_UNKNOWNNAME)

If the client is Visual Basic and you call a method in an ATL server passing
named arguments then you receive this error message:

  Run-time error '448':
  Named argument not found

CAUSE
=====

In the function CComTypeInfoHolder::GetIDsOfNames() (called by
IDispatch::GetIDsOfNames()), ATL looks up the DISPID through a cached array. If
the call to GetIDsOfNames() includes named arguments then these entries are not
in the array. In that case, CComTypeInfoHolder::GetIDsOfNames() delegates to
ITypeInfo::GetIDsOfNames(). It calls ITypeInfo::GetIDsOfNames() once for each
named argument in the method. To get the IDs of named arguments then
ITypeInfo::GetIDsOfNames() needs to be called with the method name in addition
to the named arguments.

RESOLUTION
==========

This bug has been fixed in Visual Studio 6.0 Service Pack 3.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.

This bug was corrected in Visual Studio 6.0 Service Pack 3. For more information
about Visual Studio service packs, please see the following articles in the
Microsoft Knowledge Base:

  Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

  Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed

Additional query words:

======================================================================
Keywords          : kbservicepack kbActiveX kbAutomation kbCOMt kbVC600bug kbATL300 kbATL300bug kbATL300fix kbVS600sp2bug kbFAQ kbVS600sp3fix kbVS600SP1bug kbGrpDSMFCATL 
Technology        : kbVCsearch kbAudDeveloper kbATLsearch
Version           : WINDOWS:3.0
Issue type        : kbbug
Solution Type     : kbfix

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