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From: gceych@juliet.caltech.edu (Eychaner, Glenn C.)
Newsgroups: comp.os.vms,comp.lang.c,rec.games.programmer
Subject: Re: VAX-C immediate char reading
Keywords: VAX-C VMS i/o immediate
Message-ID: <1990Dec14.195737.22164@nntp-server.caltech.edu>
Date: 14 Dec 90 19:43:43 GMT
References: <1990Dec14.191104.7874@athena.mit.edu>
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In article <1990Dec14.191104.7874@athena.mit.edu>, seaotter@athena.mit.edu writes...
> 
>Another question I'm sure has been posted before...
> 
>Is there a way under VMS 5.x using Curses (yes, NOT smg$stuff)
>to write some function next_avail_char() such that I could write
>a code fragment like
> 
>	for(;;) {
>	  if ((c = next_avail_char()) != '\0') {
>	    dostuff();
>	  } else {
>	    update_something();
>	  }
>	}
> 
>In other words I need to know if there is input waiting and if so,
>what it is.
> 
>Post or email c/o seaotter@athena.mit.edu or mzraly@ldbvax.dnet.lotus.com
>The MIT address is probably better, though.
> 
> 
>Thanks,
> Mike
> 
> 
> 
>--
> 
>| Mike Zraly                     | You should never wear your best trousers |
>|                                | when you go out to fight for freedom and |
>| via: seaotter@athena.mit.edu   | liberty. -- Henrick Ibson                |

I wanted to post this to see what OTHER people have gotten...my solution is
really weird.
I found that if I ABSOLUTELY COVERED stdscr with windows, performed a
nocrmode() and a noecho(), and then tried a getch() or getstr() (I believe
those are the calls), I get the type of behaviour you described.  However, I
found it difficult to actually enter a key, and it ate up CPU like a demon.
I don't recommend this at all.  I eventually gave up on it.
BTW, according to my CURSES manual, the functions raw() and noraw() are
supposed to return after something like 5 seconds OR a key is pressed.
I ended up calling SMG$CREATE_VIRTUAL_KEYBOARD and SMG$READ_KEYSTROKE.  These
also allow you to read the function keys and arrows and numeric keypad in
applications mode.  In fact, some of my programs are rapidly becoming
curses/smg$ hybrids...seems safe enough as long as you're careful, i.e. use
only one of them for terminal screen output (I hate string descriptors and
passing lots of things by reference).

Glenn Eychaner   |Eychaner@SunCub.Caltech.edu |Remember: It is easier to ride a
40386 N Shore Ln |gceych@iago.caltech.edu     |camel through the eye of a needle
Big Bear City, CA| Big Bear Solar Observatory |than to drive a Buick through the
            92314| !*** G O  N I N E R S ***! |hole in a doughnut.