Path: utzoo!utgpu!water!watmath!clyde!rutgers!cmcl2!brl-adm!umd5!ames!ucsd!sdcsvax!ucsdhub!sdsu!turtle
From: turtle@sdsu.UUCP (Andrew Scherpbier)
Newsgroups: comp.unix.questions
Subject: Re: a question about using curses lib
Message-ID: <2931@sdsu.UUCP>
Date: 20 Feb 88 16:43:43 GMT
References: <7078@oberon.USC.EDU>
Reply-To: turtle@sdsu.UCSD.EDU (Andrew Scherpbier)
Distribution: na
Organization: San Diego State University, Math/Sciences Dept.
Lines: 36

In article <7078@oberon.USC.EDU> xwu@pollux.usc.edu (Xinhua Wu) writes:
>I'm writing a program using curses lib.  I want to use function keys (eg,
>use arrow keys to choose from a menu).  The program should work for different
>terminal types (vt100, xterm, ibmaed, h19, etc).
>
>My general question is: how can I make the program recognize a function key
>immediately after the user hits it?
	[The rest deleted]

(I do not know if the following holds true for BSD 4.*, I only have access
to Xenix V.2 and SysV.3)
Yes, there is a function called `keypad()'.  The call should look someting
like this:
	keypad(stdscr,TRUE);	/* the 'TRUE' is to enable keypad mode */
After this call, wgetch() will return special characters as described in
curses.h (ie KEY_LEFT for the left arrow key)
Be aware (I have made this mistake MANY times..) that with keypad mode enabled,
wgetch will return a character of type `chtype'.  This is normally a `short'.
Without the keypad mode, wgetch can be assumed to return only charaters of
type `char'.
Another thing to look at is the `notimeout()' call.  Normally, in keypad mode,
wgetch will set a timer.  The purpose of the timer is to differentiate between
sequences received from a function key and those typed by a user' [from ATT Unix
System V Programmer's Reference Manual, page 437]
The call to `notimeout()' looks like this:
	notimeout(stdscr,TRUE);	/* this will turn OFF the delay timer feature */

Happy hacking,

-Andrew

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"I sometimes get the feeling that   |  Andrew Scherpbier
 things cannot possibly get worse...|  Computer Science Department
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