Hi all,
Im using the cmd module and i have command that loops and keeps on
printing text, what i want to be able to do is loop until the user
presses a particular key, say Q/q ? I tried the following code;
line = raw_input ("press q to abort")
while line[0] != "q":
""" keep printing text """
line = raw_input ("press q to abort")
but raw_input blocks for input until the newline char. So i then tried
the following code
import sys
chr = sys.stdin.read( 1)
while chr != "q":
""" keep printing text """
chr = sys.stdin.read( 1)
but again this blocks too.
is there a way to do this, wait for user input but dont block? I could
use a thread that just does the previous code block but i already have
three Thread classes, its just getting too complex with threads!
Cheers 6 14391
placid wrote:
is there a way to do this, wait for user input but dont block?
Hi,
The msvcrt module should do what you want. Here is a sample:
import msvcrt
chr = 0
while chr != 'q':
""" keep printing text """
if msvcrt.kbhit():
chr = msvcrt.getch()
Keep in mind that this will only work on windows.
-Farshid
At Thursday 10/8/2006 02:19, placid wrote:
>chr = sys.stdin.read( 1) while chr != "q":
""" keep printing text """
chr = sys.stdin.read( 1)
but again this blocks too.
is there a way to do this, wait for user input but dont block? I could use a thread that just does the previous code block but i already have three Thread classes, its just getting too complex with threads!
If your script only needs to be run on Windows -as the subject
suggests- you can use the msvcrt module:
from msvcrt import kbhit,getch
stop = False
while not stop:
print "Hello world!"
if kbhit(): stop = getch()=='q'
kbhit() is used to detect when a keypress is waiting, so the next
getch() will not block.
Gabriel Genellina
Softlab SRL
_______________ _______________ _______________ _____
Preguntá. Respondé. Descubrí.
Todo lo que querías saber, y lo que ni imaginabas,
está en Yahoo! Respuestas (Beta).
¡Probalo ya! http://www.yahoo.com.ar/respuestas
If you did want a linux version you could just make people send a
KeyboardInterup t.
try:
print "Press ^C to stop"
loop
except KeyboardInterru pt:
some stop action or just pass
Gabriel Genellina wrote:
At Thursday 10/8/2006 02:19, placid wrote:
chr = sys.stdin.read( 1)
while chr != "q":
""" keep printing text """
chr = sys.stdin.read( 1)
but again this blocks too.
is there a way to do this, wait for user input but dont block? I could
use a thread that just does the previous code block but i already have
three Thread classes, its just getting too complex with threads!
If your script only needs to be run on Windows -as the subject
suggests- you can use the msvcrt module:
from msvcrt import kbhit,getch
stop = False
while not stop:
print "Hello world!"
if kbhit(): stop = getch()=='q'
kbhit() is used to detect when a keypress is waiting, so the next
getch() will not block.
Thanks for the solution ive got it working. You were correct, the
script needs to run only on Windows.
Cheers (and thanks all for the replies)
Am Wed, 09 Aug 2006 22:19:24 -0700 schrieb placid:
Hi all,
Im using the cmd module and i have command that loops and keeps on
printing text, what i want to be able to do is loop until the user
presses a particular key, say Q/q ? I tried the following code;
There is a portable getch() implementation: http://aspn.activestate.com/ASPN/Coo.../Recipe/134892
It does not loop, it waits until the key is pressed. I hope that is what
you want.
Thomas Guettler wrote:
Am Wed, 09 Aug 2006 22:19:24 -0700 schrieb placid:
Hi all,
Im using the cmd module and i have command that loops and keeps on
printing text, what i want to be able to do is loop until the user
presses a particular key, say Q/q ? I tried the following code;
There is a portable getch() implementation:
http://aspn.activestate.com/ASPN/Coo.../Recipe/134892
It does not loop, it waits until the key is pressed. I hope that is what
you want.
i want a read operation that doesn't block and im not concerned if my
program is Windows only, which is. (im using wmi module too).
msvcrt.kbhit() and msvcrt.getch() is what i need!
Cheers This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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