CALLB: Demonstrates Member Functions As Callbacks

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

Microsoft(R) Windows(TM) 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 make files 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 GP fault by design.

CALLB was built and tested under Microsoft Windows version 3.1.

KEYWORDS: EnumObjects; EnumObjectsProc

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