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#!/usr/bin/python
from __future__ import print_function
import serial
import socket
import usb.core
import usb.util
from .escpos import *
from .constants import *
from .exceptions import *
from time import sleep
class Usb(Escpos):
""" Define USB printer """
def __init__(self, idVendor, idProduct, interface=0, in_ep=None, out_ep=None):
"""
@param idVendor : Vendor ID
@param idProduct : Product ID
@param interface : USB device interface
@param in_ep : Input end point
@param out_ep : Output end point
"""
self.errorText = "ERROR PRINTER\n\n\n\n\n\n"+PAPER_FULL_CUT
self.idVendor = idVendor
self.idProduct = idProduct
self.interface = interface
self.in_ep = in_ep
self.out_ep = out_ep
# pyusb dropped the 'interface' parameter from usb.Device.write() at 1.0.0b2
# https://github.com/pyusb/pyusb/commit/20cd8c1f79b24082ec999c022b56c3febedc0964#diff-b5a4f98a864952f0f55d569dd14695b7L293
if usb.version_info < (1, 0, 0) or (usb.version_info == (1, 0, 0) and usb.version_info[3] in ("a1", "a2", "a3", "b1")):
self.write_kwargs = dict(interface=self.interface)
else:
self.write_kwargs = {}
self.open()
def open(self):
""" Search device on USB tree and set is as escpos device """
self.device = usb.core.find(idVendor=self.idVendor, idProduct=self.idProduct)
if self.device is None:
raise NoDeviceError()
try:
if self.device.is_kernel_driver_active(self.interface):
self.device.detach_kernel_driver(self.interface)
self.device.set_configuration()
usb.util.claim_interface(self.device, self.interface)
cfg = self.device.get_active_configuration()
intf = cfg[(0,0)] # first interface
if self.in_ep is None:
# Attempt to detect IN/OUT endpoint addresses
try:
is_IN = lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_IN
is_OUT = lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_OUT
endpoint_in = usb.util.find_descriptor(intf, custom_match=is_IN)
endpoint_out = usb.util.find_descriptor(intf, custom_match=is_OUT)
self.in_ep = endpoint_in.bEndpointAddress
self.out_ep = endpoint_out.bEndpointAddress
except usb.core.USBError:
# default values for officially supported printers
self.in_ep = 0x82
self.out_ep = 0x01
except usb.core.USBError as e:
raise HandleDeviceError(e)
def close(self):
i = 0
while True:
try:
if not self.device.is_kernel_driver_active(self.interface):
usb.util.release_interface(self.device, self.interface)
self.device.attach_kernel_driver(self.interface)
usb.util.dispose_resources(self.device)
else:
self.device = None
return True
except usb.core.USBError as e:
i += 1
if i > 10:
return False
sleep(0.1)
def _raw(self, msg):
""" Print any command sent in raw format """
if len(msg) != self.device.write(self.out_ep, msg, timeout=5000, **self.write_kwargs):
self.device.write(self.out_ep, self.errorText, **self.write_kwargs)
raise TicketNotPrinted()
def __extract_status(self):
maxiterate = 0
rep = None
while rep == None:
maxiterate += 1
if maxiterate > 10000:
raise NoStatusError()
r = self.device.read(self.in_ep, 20, self.interface).tolist()
while len(r):
rep = r.pop()
return rep
def get_printer_status(self):
status = {
'printer': {},
'offline': {},
'error' : {},
'paper' : {},
}
self.device.write(self.out_ep, DLE_EOT_PRINTER, **self.write_kwargs)
printer = self.__extract_status()
self.device.write(self.out_ep, DLE_EOT_OFFLINE, **self.write_kwargs)
offline = self.__extract_status()
self.device.write(self.out_ep, DLE_EOT_ERROR, **self.write_kwargs)
error = self.__extract_status()
self.device.write(self.out_ep, DLE_EOT_PAPER, **self.write_kwargs)
paper = self.__extract_status()
status['printer']['status_code'] = printer
status['printer']['status_error'] = not ((printer & 147) == 18)
status['printer']['online'] = not bool(printer & 8)
status['printer']['recovery'] = bool(printer & 32)
status['printer']['paper_feed_on'] = bool(printer & 64)
status['printer']['drawer_pin_high'] = bool(printer & 4)
status['offline']['status_code'] = offline
status['offline']['status_error'] = not ((offline & 147) == 18)
status['offline']['cover_open'] = bool(offline & 4)
status['offline']['paper_feed_on'] = bool(offline & 8)
status['offline']['paper'] = not bool(offline & 32)
status['offline']['error'] = bool(offline & 64)
status['error']['status_code'] = error
status['error']['status_error'] = not ((error & 147) == 18)
status['error']['recoverable'] = bool(error & 4)
status['error']['autocutter'] = bool(error & 8)
status['error']['unrecoverable'] = bool(error & 32)
status['error']['auto_recoverable'] = not bool(error & 64)
status['paper']['status_code'] = paper
status['paper']['status_error'] = not ((paper & 147) == 18)
status['paper']['near_end'] = bool(paper & 12)
status['paper']['present'] = not bool(paper & 96)
return status
def __del__(self):
""" Release USB interface """
if self.device:
self.close()
self.device = None
class Serial(Escpos):
""" Define Serial printer """
def __init__(self, devfile="/dev/ttyS0", baudrate=9600, bytesize=8, timeout=1):
"""
@param devfile : Device file under dev filesystem
@param baudrate : Baud rate for serial transmission
@param bytesize : Serial buffer size
@param timeout : Read/Write timeout
"""
self.devfile = devfile
self.baudrate = baudrate
self.bytesize = bytesize
self.timeout = timeout
self.open()
def open(self):
""" Setup serial port and set is as escpos device """
self.device = serial.Serial(port=self.devfile, baudrate=self.baudrate, bytesize=self.bytesize, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, timeout=self.timeout, dsrdtr=True)
if self.device is not None:
print("Serial printer enabled")
else:
print("Unable to open serial printer on: %s" % self.devfile)
def _raw(self, msg):
""" Print any command sent in raw format """
self.device.write(msg)
def __del__(self):
""" Close Serial interface """
if self.device is not None:
self.device.close()
class Network(Escpos):
""" Define Network printer """
def __init__(self,host,port=9100):
"""
@param host : Printer's hostname or IP address
@param port : Port to write to
"""
self.host = host
self.port = port
self.open()
def open(self):
""" Open TCP socket and set it as escpos device """
self.device = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.device.connect((self.host, self.port))
if self.device is None:
print("Could not open socket for %s" % self.host)
def _raw(self, msg):
self.device.send(msg)
def __del__(self):
""" Close TCP connection """
self.device.close()
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