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

• 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
Version : WINDOWS:3.0,3.1
Platform : WINDOWS
Issue type :