Re: Delay in Displaying Dialog

[Robert Pearce <rob bdt-home demon co uk>]

On Tue, 16 Jan 2007, Matt Fischer <mattfischer84 gmail com> wrote :
>I believe it's also possible to tell the mainloop about a file
>descriptor which should be watched, and have it call a function
>whenever new data appears.  I have never used this tactic (hopefully
>someone else can clarify this)

Yes - the GTK "IO Channel" structure allows this. I have used this
approach to asynchronously monitor incoming data on a serial port, and
it seems to work fairly well. It certainly gave me FAR fewer headaches
than trying to do a similar thing on Windows!

    chan = g_io_channel_unix_new ( fd );

    g_io_channel_set_encoding ( chan, NULL, &tErrPtr );

    EventSrc = g_io_add_watch ( chan, G_IO_IN, ParseRxData, user_data );

Where ParseRxData is the data handler function:

gboolean ParseRxData ( GIOChannel *source,
                       GIOCondition condition,
                       gpointer data )

The only oddity I'm left with is that once I've run that GTK
application, the serial port in question just blocks on open for all
other applications, though I can re-run the GTK app without problem.
-- 
Rob Pearce                       http://www.bdt-home.demon.co.uk

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