Re: File Descriptor Input

[Shiraz Baig <shiraz_baig yahoo com>]

Thanks. 

Yes, I understand that <enter> key must be pressed. I
have done that. But still failed.

Actaully, I am trying to read from a socket. I have
already done that thru signal I/O. But I wanted to use
the generic functions given by the GTK.

But I have got one lead from your reply. That I should
leave "keyboard handling" alone and concentate on my
primary task of reading input from a communication
socket.

I think, I shall do that. And if I do not succeed in
that. I shall come back to the forum.

Thanks.
shiraz
--- Dave Benson <daveb ffem org> wrote:
> 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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> 
> -- 


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