I wrote:
> Hello,
>
> I'd like to check, if a single key is pressed on a Linux xterm.
> My problem is, I don't want my program to wait for the keypress.
> I just want to check, if a key is currently pressed and if not, I'd like
> to continue with my program (like "INKEY$" in some BASIC-dialects).
Ok, here's the code I use now. Thanks to Grant Edwards for pointing me into
the right direction:
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#!/usr/bin/env python
import os
import sys
import tty
import termios
import fcntl
import time
fd = sys.stdin.fileno()
oldterm = termios.tcgetattr(fd)
oldflags = fcntl.fcntl(fd, fcntl.F_GETFL)
tty.setcbreak(sys.stdin.fileno())
newattr = termios.tcgetattr(fd)
newattr[3] = newattr[3] & ~termios.ICANON & ~termios.ECHO
def oldTerminalSettings():
termios.tcsetattr(fd, termios.TCSAFLUSH, oldterm)
fcntl.fcntl(fd, fcntl.F_SETFL, oldflags)
def newTerminalSettings():
termios.tcsetattr(fd, termios.TCSANOW, newattr)
fcntl.fcntl(fd, fcntl.F_SETFL, oldflags | os.O_NONBLOCK)
def checkKey():
try:
c = sys.stdin.read(1)
return ord(c)
except IOError:
return 0
print
print "Ok, in 3 seconds, I'll check 100 times, which key you press."
print
# Initializing: Things like "raw_input()" won't work after that:
newTerminalSettings()
time.sleep(3)
for i in range(100):
a = "Key pressed: "
key = checkKey()
if key:
a += chr(key)
a += "."
else:
a += "Nothing pressed."
print a
# Somehow it doesn't work, if this loop runs too fast, so:
time.sleep(0.05)
oldTerminalSettings()
print
print "Terminal-settings restored."
print
raw_input("raw_input() works again. So please press Return: ")
print
----------------------------------------------------------
Thanks again
H.
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