KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q92433: Handling Callbacks with C++ Member Functions

Article: Q92433
Product(s): Microsoft Windows Software Development Kit
Version(s): WINDOWS:3.1
Operating System(s): 
Keyword(s): kbfile kbsample kb16bitonly kbOSWin310
Last Modified: 04-DEC-1999

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

- Microsoft Windows Software Development Kit (SDK) 3.1 
-------------------------------------------------------------------------------

SUMMARY
=======

The CALLB application demonstrates how to handle callbacks with C++ member
functions. It is a companion application for the technical article on the MSDN,
"Calling All Members: Member Functions as Callbacks."

MORE INFORMATION
================

The following files are available for download from the Microsoft Download
Center:

Callb.exe

For additional information about how to download Microsoft Support files, click
the article number below to view the article in the Microsoft Knowledge Base:

  Q119591 How to Obtain Microsoft Support Files from Online Services

Microsoft used the most current virus detection software available on the date of
posting to scan this file for viruses. Once posted, the file is housed on secure
servers that prevent any unauthorized changes to the file.


Microsoft Windows version 3.1 has over 30 callback functions that applications
can use to enumerate objects, hook into the hardware, and perform a variety of
other activities. The article explains why normal member functions cannot be
used as callback functions and gives several techniques for handling callbacks.
The article and source code are targeted toward Microsoft C/C++ version 7.0, but
the ideas presented apply to all C++ compilers, including those by Borland and
Zortech.

CALLB contains eight makefiles that create six executables: MAKE1 creates CPROG1;
MAKE2 generates a compile-time error and does not create an executable; MAKE3,
MAKE4, MAKE5, and MAKE6 create CPROG3, CPROG4, CPROG5, and CPROG6, respectively;
and TMAKE creates CTIMER. Please refer to "Calling All Members: Member Functions
as Callbacks" for more information.

NOTE: Running CPROG1 generates a general protection (GP) fault by design.

CALLB was built and tested under Microsoft Windows version 3.1.

Additional query words: EnumObjects EnumObjectsProc softlib CALLB.EXE kbtoolkit kbfile

======================================================================
Keywords          : kbfile kbsample kb16bitonly kbOSWin310 
Technology        : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310
Version           : WINDOWS: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.