From: AW <jojo_dfb@...>
Date: 2002-12-23T09:41:19+09:00
Subject: Re: How to read a single character from DOS prompt in windows (without <Enter>)?

I used the sleep command simply because the script would unduce the CPU
to run at 100% while waiting.

Usano wrote:

> Thanks AW.  I have used the following...
> 
> require "Win32API"
> 
> print "Answer (Y/N): "
> char = Win32API.new("crtdll", "_getch", [], 'L').Call
> putc char
> putc ?\n
> if [?Y,?y].include? char
>        puts "You pressed 'Y'"
> else
>        puts "You didn't press 'Y'"
> end
> 
> ....but I have a question about your use of kbhit() and sleep().  I
> assume that while my code is waiting, Windows will still allocate time
> slices for other programs that might be running at the same time.
> Does using kbhit() and sleep() allow time to be given to other threads
> that may be running concurrently in the same Ruby program as the
> _getch()?
> 
> Thank you for the help,
>    - Usano
> 
> On Mon, 16 Dec 2002 20:18:58 GMT, AW <sturmpanzer@metacrawler.com>
> wrote:
> 
> >This (or something like it) was posted a while ago by some helpfull
> >person (I forget their name). Its a win32 version.
> >
> >require 'Win32API'
> >
> >kbhit = Win32API.new("crtdll", "_kbhit", [], 'L')
> >getch = Win32API.new("crtdll", "_getch", [], 'L')
> >loop{
> >       puts " #{getch.Call.chr} pressed" if kbhit.Call != 0
> >       sleep 0.1
> >}
> >
> >>Can anyone tell me how to get a single character from the command line
> >>prompt without the user pressing <Enter>?  This would be in response
> >>to a Yes/No question or a number from a simple printed menu.
> >>
> >>I did notice something in my "The Ruby Way" book which talked about
> >>the feature being in TK.  Is there nothing in standard Ruby?
> >>
> >>Thanks,
> >>   - Usano
>