Re: What is the minimum number of lines to update a gui window without user clicking a button

[Chris Vine <chris cvine freeserve co uk>]

On Sat, 10 Aug 2013 05:43:42 -0400
"L. D. James" <ljames apollo3 com> wrote:
> When I first started programming and was able to output a "Hello
> World", I was happy.  It worked.  I made lots of changes and
> understood it. When I performed my first I/O  it was just a minimum
> number of lines and did a strictly limited task.  I was able to
> dissect it in one short session, then start using it productively in
> my crude programs.
>
> I'm trying to find this same strict focus with outputting and updating
> the gtkmm gui (without user input).  If I can understand this, I'll
> have a foundation of which I could build upon.

The point you may not understand is that you would rarely if ever want
to do this in a simple real-world application, and particularly where
your simple application is a learning exercise about using GTK+. GTK+
is, like almost all other GUI toolkits, event driven, and runs in a main
loop. Therefore, if text arrives which you want to put in a widget, it
would normally arrive as an event.  If you are monitoring I/O, you
would use Glib::signal_io().connect() to connect a file descriptor or
Glib::IOChannel object to the main loop. Similar convenience functions
are available for timeouts and idle handlers.

I would strongly advise you not to get involved in using threads until
you have more programming experience.

Chris