class ThermalPrinter():
def __init__(self):
self.p = Usb(0x0fe6, 0x811e, 98, 0x82, 0x02)
def insert_imagen(self, img_surce):
self.p.image(img_surce)
def insert_qr(self, content, size):
self.p.qr(content, size=size) #size 1 - 16 default 3
def insert_barcode(self, code, bc, height, width):
self.p.barcode(code, bc, height=height, width=width)
def insert_text(self, txt):
self.p.text(txt)
def insert_raw_txt(self, txt):
self.p._raw(txt)
# harware action, may be: INIT, SELECT, RESET
def hardware_operation(self, hw):
self.p.hw(hw)
#string for the following control sequences:
# LF for Line Feed
# FF for Form Feed
# CR for Carriage Return
# HT for Horizontal Tab
# VT for Vertical Tab
#pos = horizontal tab position 1 - 16
def feed_control(self, ctl, pos):
self.p.control()
self.p.charcode()
# #def insert_textln(self, txt):
# align = CENTER LEFT RIGHT default left
# font_type = A or B default A
# textt_type = B(bold), U(underline), U2(underline, version2), BU(for bold and underlined, NORMAL(normal text) defaul tnormal
# width = width multiplier decimal 1 - 8 defaul 1
# heigh = height multiplier decimal 1 - 8 defaul 1
# density = density 0 - 8
# def set_txt(self, align, font, text_type, density, height, width):
def set_txt(self, *args, **Kwargs):
print(Kwargs)
self.p.set(Kwargs)
def cut_paper(self):
self.p.cut()
class PosPrinter:
"""
Class to interface with the POS printer.
"""
def __init__(self, product_id, vendor_id, test_mode=False):
"""
Also does error handling
:param product_id: Printer product ID as integer
:param vendor_id: Printer vendor ID as integer
:param test_mode: boolean, when set to true modifies error messages and prevents modification of the global
settings. Used for print tests (duh)
:return: nil
"""
self.product_id = product_id
self.vendor_id = vendor_id
self._printer = None
self.test_mode = test_mode
# changes message end if test mode is true
message_end = "\n\nPrinting disabled"
if self.test_mode:
message_end = ""
self.failed = True # can be used to determine if a popup was shown - set false if successful in try below
# in case printing is disabled (and test mode is disabled), just do nothing
# if it's in test mode, you want it to actually do stuff and test...
if not SETTINGS["printer"]["enable"] and not self.test_mode:
return
try:
self._printer = Usb(self.product_id, self.vendor_id)
self._printer.hw("INIT")
self.failed = False
except escpos.exceptions.USBNotFoundError:
popup_message("Printer not found - please check the printer is plugged in and turned on and that the vendor"
f" and product IDs correct.{message_end}",
error=True)
if not self.test_mode:
SETTINGS["printer"]["enable"] = False
except USBError as e:
if "Errno 13" in str(e):
popup_message(f"USB error 13 - it looks like something else is using the printer.\n\n{message_end}",
error=True)
if not self.test_mode:
SETTINGS["printer"]["enable"] = False
else:
popup_message(f"{e}{message_end}", error=True)
logger.exception("Unrecognised USB error")
if not self.test_mode:
SETTINGS["printer"]["enable"] = False
except NoBackendError:
print("nobackend")
popup_message(f"There was an issue connecting to the printer. Please refer to the documentation.{message_end}",
error=True)
logger.exception("No backend was available - Possible mis-installation of libusb-1.0.dll or WinUSB driver.")
if not self.test_mode:
SETTINGS["printer"]["enable"] = False
def print(self, data):
"""
Prints data if printer is initialised.
:param data: binary data to send to POS printer
:return: nil
"""
if self._printer is None:
helper.add_event((lambda: True), (lambda: popup_message("Printer not initialised.\n\nPrinting disabled.",
error=True)))
self.failed = True
if not self.test_mode:
SETTINGS["printer"]["enable"] = False
return
self._printer._raw(data)
def close(self):
"""
Closes printer connection
:return: nil
"""
self._printer = None
def reset(self):
"""
Closes and reopens printer connection
:return: nil
"""
self.close()
try:
self._printer = Usb(self.product_id, self.vendor_id)
except: # in the event of any error (eg NoBackendAvail)
# TODO: Change to raise an exception or do something other than this
self._printer = None
def update_ids(self, product_id, vendor_id):
"""
Changes printer IDs and then resets
:param product_id: printer product ID as integer
:param vendor_id: printer vendor ID as integer
:return: nil
"""
self.product_id = product_id
self.vendor_id = vendor_id
self.reset()
