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comp.lang.ruby

Re: Console Application Keyboard event catch

marble.zhong

7/3/2007 4:17:00 AM



Thanks Jano,

Could make a sample for it? Or give me the related API? Thanks.
And, want to catch the event, not only catch the what user input after
press [Enter], thanks.

Marble

-----Original Message-----
From: Jano Svitok [mailto:jan.svitok@gmail.com]
Sent: Tuesday, July 03, 2007 5:35 AM
To: ruby-talk@ruby-lang.org
Subject: Re: Console Application Keyboard event catch

On 7/2/07, marble.zhong@oocl.com <marble.zhong@oocl.com> wrote:
>
>
>
> Dear All,
>
> While doing the console application with Ruby, met below questions,
> please help, thanks in advance,
>
> 1. How to catch the Keyboard event, such as, how about the
> [TAB] key pressed, [CTRL] key and so on;
> 2. How to backdisplay the string? Such as, when you type [cd]
> command at the windows command mode, and press [TAB] it will help to
> complete the directory name, such as [abc] directory, once you press
> again, it will delete the [abc] directory and display another one,
> such as [efg].
>
> I try search from the google, but no result, please help thanks.

1. TAB is character #9, Ctrl+A is (IIRC) 0, Ctrl+B 1, etc. If you want
to catch all the combinations, you need to use special api, i.e. getch
from msvcrt, or curses.

2. BS (backspace, Ctrl+H) moves cursor one char left. CR (carriege
return, 13) moves cursor to the start of the line (you need to overwrite
everything you have written before, and it's possible that a screen will
scroll up, and LF (line feed) will be inserted by ruby)

3. have a look at readline library, it may do what you are trying to
achieve.

J.








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1 Answer

Jano Svitok

7/3/2007 10:52:00 PM

0

On 7/3/07, marble.zhong@oocl.com <marble.zhong@oocl.com> wrote:
>
>
> Thanks Jano,
>
> Could make a sample for it? Or give me the related API? Thanks.
> And, want to catch the event, not only catch the what user input after
> press [Enter], thanks.

Hi,

this is how you can obtain pressed keys on windows:

require 'Win32API'

module Windows
module Keyboard
Getch = Win32API.new('crtdll', '_getch', 'V', 'L')
Kbhit = Win32API.new('crtdll', '_kbhit', 'V', 'L')

def getch
Getch.call
end

def kbhit
Kbhit.call
end
end
end

and this is how you can use readline library to prompt and provide completion:

require 'readline'
Readline.completion_proc = proc {|word| ['array', 'of', 'possible',
'completions']}
line = Readline.readline("prompt>", true) # true means history on

J.