Non blocking keypress reading?

ruby-talk
1

On Windows XP is there a way to test that a certain key has been pressed
without blocking?

I’ve tried using curses but it blocks the current thread and any other
thread until a key is pressed.

I want to give the user 10 seconds so make a selection before a default
action is taken.

Here is the test code I’ve got;

  require 'curses'
  include Curses
  init_screen
  noecho
  trap(0) { echo }

  t1 = Time.new
  Thread.new do

    #example timer thread
    while(true) do
    x = Time.new - t1
    h = 3+3
    setpos(12,10)

    addstr("#{x}")

  end
  end

  setpos(1,5)
  addstr("Please select your location")
  setpos(3,5)
  addstr(" 1 - Work")
  setpos(4,5)
  addstr(" 2 - Home")
  setpos(6,5)
  addstr("Esc - Exit")
  while (c = getch) != ?\e do
   # check what key is pressed and do stuff
  end

···

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2

Sard Aukary wrote:

On Windows XP is there a way to test that a certain key has been pressed
without blocking?

http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/4435

···

From my quick search, I didn't find a way. Maybe this will help though?

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3

search the archive for kbhit

···

On 9/8/06, Sard Aukary <sardaukary@yahoo.co.uk> wrote:

On Windows XP is there a way to test that a certain key has been pressed
without blocking?

I've tried using curses but it blocks the current thread and any other
thread until a key is pressed.

I want to give the user 10 seconds so make a selection before a default
action is taken.

Here is the test code I've got;

        require 'curses'
        include Curses
        init_screen
        noecho
        trap(0) { echo }

        t1 = Time.new
        Thread.new do

                #example timer thread
                while(true) do
                x = Time.new - t1
                h = 3+3
                setpos(12,10)

          addstr("#{x}")

        end

        setpos(1,5)
        addstr("Please select your location")
        setpos(3,5)
        addstr(" 1 - Work")
        setpos(4,5)
        addstr(" 2 - Home")
        setpos(6,5)
        addstr("Esc - Exit")
        while (c = getch) != ?\e do
         # check what key is pressed and do stuff
        end

4

On Windows XP is there a way to test that a certain key has been pressed
without blocking?

I’ve tried using curses but it blocks the current thread and any other
thread until a key is pressed.

I want to give the user 10 seconds so make a selection before a default
action is taken.

require 'timeout'
begin
Timeout.timeout(10) do
key = gets
end
rescue Timeout::Error
key = default
end

···

On Friday 08 September 2006 20:42, Sard Aukary wrote:

Here is the test code I’ve got;

  require 'curses'
  include Curses
  init_screen
  noecho
  trap(0) { echo }

  t1 = Time.new
  Thread.new do

    #example timer thread
    while(true) do
    x = Time.new - t1
    h = 3+3
    setpos(12,10)

    addstr("#{x}")

  end
  end

  setpos(1,5)
  addstr("Please select your location")
  setpos(3,5)
  addstr(" 1 - Work")
  setpos(4,5)
  addstr(" 2 - Home")
  setpos(6,5)
  addstr("Esc - Exit")
  while (c = getch) != ?\e do
   # check what key is pressed and do stuff
  end

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