KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q98871: PRB: Using HSZ in AFXEXT.H and DDEML.H

Article: Q98871
Product(s): Microsoft Windows Software Development Kit
Version(s): WINDOWS:3.0,3.1
Operating System(s): 
Keyword(s): kb16bitonly
Last Modified: 05-NOV-1999

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

- Microsoft Windows Software Development Kit (SDK) versions 3.0, 3.1 
-------------------------------------------------------------------------------

SYMPTOMS
========

When using both the AFXEXT.H and DDEML.H include files in the same source file,
the following message is received:

  error C2371: 'HSZ' : redefinition; different basic types

CAUSE
=====

The problem is a naming conflict between Dynamic Date Exchange Management
Library (DDEML) and Visual Basic eXtension (VBX) files controls, in which both
use the type HSZ [handle to a string that is zero (NULL) terminated] but with
with different meanings.

AFXEXT.h includes the definition of HSZ in order to support the Control
Development Kit (CDK), and DDEML.H uses HSZ as a string type.

RESOLUTION
==========

Workarounds for this problem include:

- Separate the DDEML and VBX code into different files, thus preventing
  AFXEXT.H and DDEML.H from being included in the same source file.

-or-

- Use #define NO_VBX_SUPPORT in the file that implements DDE. This will cause
  DDEML's definition of HSZ to be used.

Additional query words: 3.10 c2371

======================================================================
Keywords          : kb16bitonly 
Technology        : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK300 kbWinSDK310
Version           : WINDOWS:3.0,3.1

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

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.