Re: File Descriptor Input

[Dave Benson <daveb ffem org>]

your problem is that standard input is line-buffered,
so you only get input when ENTER is pressed.
(in the terminal from which you run the program!)

I don't know exactly the behavior you want when you "trap the keyboard".
if you are writing a gui, you must use X windows (eg gtk_widget_add_events() and
connecting to the "key-pressed-event" signal (only works with a toplevel widget!))
if you are writing a ncurses program, there's other functions
you must read about in that library...

in any event, without special calls to tcsetattr to put stdin in "raw" mode,
gdk_input_add( fileno(stdin), ...) is unlikely to be what you want.

the reason why no one responds:  keyboard handling is a mess,
and your question seems vague to someone who knows the answer ;)

- dave

On Thu, Mar 27, 2003 at 07:40:55PM -0800, Shiraz Baig wrote:
> 
> --- Paul Davis <paul linuxaudiosystems com> wrote:
> 
> First Point:
> ------------
> > that's not what it says. it says:
> > 
> > gint        gdk_input_add                   (gint
> > source,
> >                                             
> > GdkInputCondition condition,
> >                                             
> > GdkInputFunction function,
> > gpointer data);
> 
> /**** Ok, I have now revised it as follows ***/
> 
> void input_callback( gpointer          data,
>                      gint              source, 
>                      GdkInputCondition condition )
> {
>   gchar *mesg;
>   mesg =data;
>   g_print("Got something.\n");
> }
> 
> main()
> .........
> gint gdk_input_add( fileno(stdin),
>                     GTK_INPUT_READ,
>                     (GtkInputFunction) input_callback,
>                     gpointer          data );
> .............
> 
> But it still does not invoke that function call. My
> purpose is that at least the function be called. Then
> I can start thinking of something else.
> 
> Second Point:
> -------------
> > you can't do this. if you don't read the data, then
> > your function will
> > be called again immediately, because there is still
> > data to be read.
> 
> I wish, it is called again and again :-)
> My problem is that it is not being called at all :-(
> 
> Third point:
> -----------
> > this is completely wrong. i think you need a little
> > experience with C programming. 
> 
> May be I failed to explain myself. I have been doing
> programming in c for last 10 years. In fact, recently,
> ,I have written a multi-threaded, multiplexed (stdin
> and socket input), multicast application in
> transmission of video image with RTP protocol.
> So, I hope, I have adequate experience.
> 
> Thanks for bearing with me, and listening to my, may
> be foolish questions.
> 
> Bye and I shall wait for your answer. At least you are
> responding , others are not.
> 
> bye
> 
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