What is the use of message map ?

Answer Posted / arvind

MessageMap is a logical table that maps the windows messages
to the member functions of the class.

MFC handles Windows message in a different way. Because MFC
applications are built upon classes, it is more convenient
to handle messages within class member functions instead of
one big callbackfunction.
In MFC, this is achieved through message mapping: we can
implement the functions that will be
used to execute commands, and use macros defined in MFC to
direct the messages into these member
functions.

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