Re: How do I use the Event driven system to...

[Peter Krueger <pkrueger appss de>]

On Sat, 28 Feb 2004, Douglas Phillipson wrote:
> Ive gotten to know and use GTK pretty well so far, but I haven't seen
> how to do things that aren't event driven.  For example, how would one
> monitor the serial port or uSB port for incomming data to display on the
> graphics area as it comes in.  Can I somehow attach a GTK event to the
> serial port and get dropped in a callback routine to grab data when I
> see a byte?  I don't need to know how to monitor the serial port, I can
> do that already but if GTK sits in an event loop, how do you get input
> from non GTK stuff to use and display with GTK?
Hello Douglas,
in our applications we use our own main loop to process different things.
Part of this mainloop is to process GTK events. We do this with the
command:

  while (gtk_events_pending()) gtk_main_iteration();

This processes all pending events and doesn't block your mainloop if there
shouldn't be any GTK events to process.
Another approach would be the use of an idle function in combination with
gtk_main(). See g_idle_add().
In both approaches your program is able to regularly check the serial port
for new data.

Regards,
                         Peter
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