Call Backs

From	Edward Rutherford <edward.p.rutherford79@REMOVETHIS.gmail.com>
Newsgroups	comp.lang.c
Subject	Call Backs
Date	2012-02-15 19:33 +0000
Organization	Aioe.org NNTP Server
Message-ID	<jhh1aj$43c$1@speranza.aioe.org> (permalink)

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I've read plenty of discussion about callback functions as used in C (ie 
in qsort).  I'm comfortable with this: really it is a
function pointer.  What I'm not sure about is how (or if) a
callback differs to events like GUI's use.  One of the things I
found about events, at least in a VB6 project I did, is that an event
can be broadcast to all objects and they can use it if desired (code
only and GUI objects).  Each object has to have a receive function for
that event though.

The only way I can see to do event broadcasting with a callback is to
have a special callback that in turn calls a list of receiver functions
that would be in each module.  For example, a timer that broadcasts a
time tick every second would call a function (for example)
Timer_1min(void) that in turn would call functions in all of the modules
that need to know the time.  I've also thought about a message que, but
that is begining to sound like too much work.  Is there a better way?

Thanks for any helpful information.

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Call Backs Edward Rutherford <edward.p.rutherford79@REMOVETHIS.gmail.com> - 2012-02-15 19:33 +0000
  Re: Call Backs tom st denis <tom@iahu.ca> - 2012-02-15 11:36 -0800
    Re: Call Backs James Kuyper <jameskuyper@verizon.net> - 2012-02-15 15:02 -0500
    Re: Call Backs Devil with the China Blue Dress <chine.bleu@yahoo.com> - 2012-02-15 12:27 -0800
    Re: Call Backs Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-02-16 02:56 -0800
  Re: Call Backs Lew Pitcher <lpitcher@teksavvy.com> - 2012-02-15 15:20 -0500
  Re: Call Backs Devil with the China Blue Dress <chine.bleu@yahoo.com> - 2012-02-15 12:24 -0800
  Re: Call Backs Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-15 16:02 -0800
  Re: Call Backs Shao Miller <sha0.miller@gmail.com> - 2012-02-16 01:21 -0500
    Re: Call Backs Shao Miller <sha0.miller@gmail.com> - 2012-02-16 01:25 -0500
  Re: Call Backs Willem <willem@toad.stack.nl> - 2012-02-17 21:58 +0000

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