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Q190726: FIX: Visual C++ 5.0 #import Causes Errors with ADO Version 2.0

Article: Q190726
Product(s): Microsoft C Compiler
Version(s): WINDOWS:2.0; winnt:5.0
Operating System(s): 
Keyword(s): kberrmsg kbADO200 kbVC500bug kbVC600fix
Last Modified: 07-MAY-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Visual C++, 32-bit Enterprise Edition, version 5.0 
- Microsoft Visual C++, 32-bit Professional Edition, version 5.0 
- ActiveX Data Objects (ADO), version 2.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

On a clean Windows 95 or Windows 98 machine with DCOM95 or DCOM98 installed,
compile the following in a .cpp file:

  #import "c:\program files\common files\system\ado\msado15.dll"

RESULT: You get the following error messages:

  error C2504: '_Connection15' : base class undefined

  error C2504: '_Recordset15' : base class undefined

  error C2504: 'Fields15' : base class undefined

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Connection *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::_Recordset *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::Fields *const ' to 'struct IUnknown *'

  error C2664: '_com_issue_errorex' : cannot convert parameter 2 from
               'struct ADODB::Fields *const ' to 'struct IUnknown *'

NOTE: This problem also occurs on Windows NT 4.0, and the resolution given
applies.

CAUSE
=====

This is a problem in the #import feature of the compiler.

RESOLUTION
==========

To work around this problem, use one of the following alternatives:

- Install Visual Studio 97, Service Pack 3.

- Upgrade to Visual C++, version 6.0.

- Modify the resultant .tlh file by moving each of the declarations for

  _Connection15, _Recordset15, and Field15

  ahead of each of the declarations for

  Connection, Recordset, and Field.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. The problem has been corrected in Visual Studio 97,
Service Pack 3, and also in Visual C++ version 6.0.

REFERENCES
==========

For additional information about how to obtain Visual Studio 97, Service Pack 3,
please see the following article in the Microsoft Knowledge Base:

  Q170365 Visual Studio 97 Service Packs - What, Where, and Why

Additional query words:

======================================================================
Keywords          : kberrmsg kbADO200 kbVC500bug kbVC600fix 
Technology        : kbVCsearch kbAudDeveloper kbADOsearch kbADO200 kbVC500 kbVC32bitSearch kbVC500Search
Version           : WINDOWS:2.0; winnt:5.0
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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