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import evdev
from evdev import InputDevice, categorize, ecodes
import threading
import time
import selectors
from selectors import DefaultSelector, EVENT_READ
selector = selectors.DefaultSelector()
qrdevice_list = [
"Honeywell Imaging & Mobility 1900",
"Manufacturer Barcode Reader",
"SM SM-2D PRODUCT HID KBW"
]
qrkey_list = { 'KEY_0':'0',
'KEY_1':'1',
'KEY_2':'2',
'KEY_3':'3',
'KEY_4':'4',
'KEY_5':'5',
'KEY_6':'6',
'KEY_7':'7',
'KEY_8':'8',
'KEY_9':'9'
}
class QRReader:
__qrstr = ""
__myReader = {}
__numdigits = 10
__dev = None
def __init__(self):
self.getQRlist()
def getQRlist(self):
devices = [evdev.InputDevice(path) for path in evdev.list_devices()]
for device in devices:
if device.name in qrdevice_list:
self.__myReader['NAME'] = device.name
#print(self.__myReader['NAME'])
self.__myReader['PATH'] = device.path
#print(self.__myReader['PATH'])
self.__myReader['PHYS'] = device.phys
#print(self.__myReader['PHYS'])
def IsQR (self):
return 'NAME' in self.__myReader
def getQRNumber(self):
return self.__qrstr
def openQR(self):
if self.IsQR():
self.closeQR()
self.__dev = InputDevice(self.__myReader['PATH'])
return True
return False
def closeQR(self):
if self.__dev:
del self.__dev
self.__dev = None
def readQR(self):
"""" Sync Read up to numdigits """
count = 0
self.__qrstr = ""
if self.__dev:
self.__dev.grab()
for event in self.__dev.read_loop():
if event.type == evdev.ecodes.EV_KEY:
c_event = categorize(event)
if c_event.keycode in qrkey_list:
if c_event.keystate == 0:
self.__qrstr += qrkey_list[c_event.keycode]
count += 1
if count == self.__numdigits:
break
self.__dev.ungrab()
return True
return False
def wait_event (self, timeout):
selector.register(self.__dev, selectors.EVENT_READ)
while True:
events = selector.select(timeout);
if not events:
return False
else:
return True
def readQRasync(self, timeout):
count = 0
r = False
self.__qrstr = ""
if self.__dev:
self.__dev.grab()
if self.wait_event(timeout):
for event in self.__dev.read_loop():
if event.type == evdev.ecodes.EV_KEY:
c_event = categorize(event)
if c_event.keycode in qrkey_list:
if c_event.keystate == 0:
self.__qrstr += qrkey_list[c_event.keycode]
count += 1
if count == self.__numdigits:
r = True
break
self.__dev.ungrab()
return r
return False
#qr = QRReader()
#if qr.openQR():
# print(qr.readQRasync(2))
#qr.closeQR()
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