HELP Non-Blocking reads from sys.stdin in Windows.

[barr]

Hi

I am in real need of a way to perform non blocking reads from sys.stdin on
windows. I have looked every where for an answer but but with no luck. I
beleive there there must be a way of doing this, can some one please help
asap.

Thanks in advance,

Barr

 

[Paul Rubin]

I am in real need of a way to perform non blocking reads from sys.stdin on
windows. I have looked every where for an answer but but with no luck. I
beleive there there must be a way of doing this, can some one please help
asap.

Use a separate thread.

 

[barr]

hi
Do you mean something like the following.

class inputReader(Thread):
def __init__(self):
Thread.__init__(self)
def run(self):
buffer = sys.readline()

thread = inputReader()
thread.start()

Thanks

Kwame

 

[Miki Tebeka]

Hello Barr,

I am in real need of a way to perform non blocking reads from sys.stdin on
windows. I have looked every where for an answer but but with no luck. I
beleive there there must be a way of doing this, can some one please help
asap.

Warning: The below code wasn't tested at all...

-------------------------------
from Queue import Queue, Empty
from sys import stdin
from threading import Thread

# Reading from empty stdin error
class EmptyError(Exception): pass

# Input queue
_queue = Queue()

def produce():
'''Read one char at a time from stdin and place in _queue'''
try:
while 1:
c = stdin.read(1) # Read one char
if not c: # EOF
_queue.put(EOFError, 1)
break
_queue.put(c, 1)
except EOFError, e:
_queue.put(EOFError)

# Start the thread
t = Thread(target=produce)
t.setDaemon(1) # Don't inhibit interperter exit
t.start() # Start thread

def get():
'''Get one item from queue.

Might raise EmptyError if queue is empty or EOFError of end of input
'''
try:
val = _queue.get(0)
if val is EOFError:
raise EOFError
return val
except Empty:
raise EmptyError

def is_empty():
'''Tell if no input is ready'''
return _queue.empty()