462 lines
14 KiB
Python
462 lines
14 KiB
Python
#!/usr/bin/python
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"""
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@author: Manuel F Martinez <manpaz@bashlinux.com>
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@organization: Bashlinux
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@copyright: Copyright (c) 2012 Bashlinux
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@license: GNU GPL v3
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"""
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from PIL import Image, ImageOps
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import struct
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import qrcode
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import time
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import textwrap
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import binascii
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import operator
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from .constants import *
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from .exceptions import *
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from abc import ABCMeta, abstractmethod # abstract base class support
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class Escpos(object):
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""" ESC/POS Printer object """
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__metaclass__ = ABCMeta
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device = None
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def __init__(self, columns=32):
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""" Initialize ESCPOS Printer
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:param columns: Text columns used by the printer. Defaults to 32."""
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self.columns = columns
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@abstractmethod
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def _raw(self, msg):
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""" Sends raw data to the printer
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This function has to be individually implemented by the implementations.
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:param msg: message string to be sent to the printer
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"""
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pass
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@staticmethod
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def _check_image_size(size):
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""" Check and fix the size of the image to 32 bits
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:param size: size of the image
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:returns: tuple of image borders
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:rtype: (int, int)
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"""
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if size % 32 == 0:
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return 0, 0
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else:
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image_border = 32 - (size % 32)
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if (image_border % 2) == 0:
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return (round(image_border / 2), round(image_border / 2))
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else:
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return (round(image_border / 2), round((image_border / 2) + 1))
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def _print_image(self, imagedata, n_rows, col_bytes):
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""" Print formatted image
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:param line:
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:param size:
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"""
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self._raw(S_RASTER_N)
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pbuffer = struct.pack('<HH', col_bytes, n_rows)
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self._raw(pbuffer)
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self._raw(imagedata)
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pbuffer = ""
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def fullimage(self, img, max_height=860, width=512, histeq=True, bandsize=255):
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""" Resizes and prints an arbitrarily sized image """
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if isinstance(img, Image.Image):
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im = img.convert("RGB")
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else:
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im = Image.open(img).convert("RGB")
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if histeq:
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# Histogram equaliztion
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h = im.histogram()
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lut = []
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for b in range(0, len(h), 256):
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# step size
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step = reduce(operator.add, h[b:b+256]) // 255
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# create equalization lookup table
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n = 0
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for i in range(256):
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lut.append(n // step)
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n = n + h[i+b]
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im = im.point(lut)
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if width:
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ratio = float(width) / im.size[0]
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newheight = int(ratio * im.size[1])
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# Resize the image
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im = im.resize((width, newheight), Image.ANTIALIAS)
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if max_height and im.size[1] > max_height:
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im = im.crop((0, 0, im.size[0], max_height))
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# Divide into bands
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current = 0
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while current < im.size[1]:
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self.image(im.crop((0, current, width or im.size[0],
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min(im.size[1], current + bandsize))))
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current += bandsize
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def image(self, im):
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""" Parse image and prepare it to a printable format """
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pixels = []
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pix_line = ""
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im_left = ""
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im_right = ""
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switch = 0
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img_size = [ 0, 0 ]
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if not isinstance(im, Image.Image):
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im = Image.open(im)
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im = im.convert("L")
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im = ImageOps.invert(im)
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im = im.convert("1")
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if im.size[0] > 640:
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print("WARNING: Image is wider than 640 and could be truncated at print time ")
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if im.size[1] > 640:
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raise ImageSizeError()
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orig_width, height = im.size
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width = ((orig_width + 31) // 32) * 32
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new_image = Image.new("1", (width, height))
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new_image.paste(im, (0, 0, orig_width, height))
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the_bytes = new_image.tobytes()
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self._print_image(the_bytes, n_rows=height, col_bytes=width//8)
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def direct_image(self, image):
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""" Send image to printer"""
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mask = 0x80
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i = 0
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temp = 0
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(width, height) = image.size
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self._raw(S_RASTER_N)
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headerX = int(width / 8)
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headerY = height
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buf = "%02X" % (headerX & 0xff)
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buf += "%02X" % ((headerX >> 8) & 0xff)
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buf += "%02X" % (headerY & 0xff)
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buf += "%02X" % ((headerY >> 8) & 0xff)
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#self._raw(binascii.unhexlify(buf))
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for y in range(height):
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for x in range(width):
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value = image.getpixel((x,y))
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value = (value << 8) | value;
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if value == 0:
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temp |= mask
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mask = mask >> 1
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i += 1
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if i == 8:
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buf += ("%02X" % temp)
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mask = 0x80
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i = 0
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temp = 0
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self._raw(binascii.unhexlify(bytes(buf, "ascii")))
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self._raw('\n')
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def qr(self, text, error_correction=qrcode.constants.ERROR_CORRECT_M):
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""" Print QR Code for the provided string
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:param text: text to generate a QR-Code from
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"""
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qr_code = qrcode.QRCode(version=4, box_size=4, border=1, error_correction=error_correction)
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qr_code.add_data(text)
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qr_code.make(fit=True)
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qr_img = qr_code.make_image()
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# Convert the RGB image in printable image
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im = qr_img._img.convert("1")
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width = im.size[0]
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height = im.size[1]
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while width * 2 <= 640:
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width *= 2
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height *= 2
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im = im.resize((width, height))
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self.image(im)
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self.text('\n')
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def charcode(self, code):
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""" Set Character Code Table
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Sends the control sequence from constants.py to the printer with :py:meth:`escpos.printer._raw()`.
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:param code: Name of CharCode
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:raises: CharCodeError
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"""
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if code.upper() == "USA":
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self._raw(CHARCODE_PC437)
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elif code.upper() == "JIS":
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self._raw(CHARCODE_JIS)
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elif code.upper() == "MULTILINGUAL":
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self._raw(CHARCODE_PC850)
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elif code.upper() == "PORTUGUESE":
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self._raw(CHARCODE_PC860)
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elif code.upper() == "CA_FRENCH":
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self._raw(CHARCODE_PC863)
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elif code.upper() == "NORDIC":
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self._raw(CHARCODE_PC865)
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elif code.upper() == "WEST_EUROPE":
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self._raw(CHARCODE_WEU)
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elif code.upper() == "GREEK":
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self._raw(CHARCODE_GREEK)
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elif code.upper() == "HEBREW":
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self._raw(CHARCODE_HEBREW)
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# elif code.upper() == "LATVIAN": # this is not listed in the constants
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# self._raw(CHARCODE_PC755)
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elif code.upper() == "WPC1252":
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self._raw(CHARCODE_PC1252)
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elif code.upper() == "CIRILLIC2":
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self._raw(CHARCODE_PC866)
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elif code.upper() == "LATIN2":
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self._raw(CHARCODE_PC852)
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elif code.upper() == "EURO":
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self._raw(CHARCODE_PC858)
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elif code.upper() == "THAI42":
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self._raw(CHARCODE_THAI42)
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elif code.upper() == "THAI11":
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self._raw(CHARCODE_THAI11)
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elif code.upper() == "THAI13":
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self._raw(CHARCODE_THAI13)
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elif code.upper() == "THAI14":
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self._raw(CHARCODE_THAI14)
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elif code.upper() == "THAI16":
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self._raw(CHARCODE_THAI16)
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elif code.upper() == "THAI17":
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self._raw(CHARCODE_THAI17)
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elif code.upper() == "THAI18":
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self._raw(CHARCODE_THAI18)
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else:
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raise CharCodeError()
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def barcode(self, code, bc, width, height, pos, font):
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""" Print Barcode
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:param code: data for barcode
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:param bc: barcode format, see constants.py
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:param width: barcode width, has to be between 1 and 255
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:param height: barcode height, has to be between 2 and 6
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:param pos: position of text in barcode, default when nothing supplied is below
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:param font: select font, default is font A
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:raises: BarcodeSizeError, BarcodeTypeError, BarcodeCodeError
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"""
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# Align Bar Code()
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self._raw(TXT_ALIGN_CT)
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# Height
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if height >= 2 or height <= 6:
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self._raw(BARCODE_HEIGHT)
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else:
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raise BarcodeSizeError()
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# Width
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if width >= 1 or width <= 255:
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self._raw(BARCODE_WIDTH)
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else:
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raise BarcodeSizeError()
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# Font
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if font.upper() == "B":
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self._raw(BARCODE_FONT_B)
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else: # DEFAULT FONT: A
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self._raw(BARCODE_FONT_A)
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# Position
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if pos.upper() == "OFF":
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self._raw(BARCODE_TXT_OFF)
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elif pos.upper() == "BOTH":
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self._raw(BARCODE_TXT_BTH)
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elif pos.upper() == "ABOVE":
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self._raw(BARCODE_TXT_ABV)
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else: # DEFAULT POSITION: BELOW
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self._raw(BARCODE_TXT_BLW)
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# Type
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if bc.upper() == "UPC-A":
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self._raw(BARCODE_UPC_A)
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elif bc.upper() == "UPC-E":
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self._raw(BARCODE_UPC_E)
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elif bc.upper() == "EAN13":
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self._raw(BARCODE_EAN13)
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elif bc.upper() == "EAN8":
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self._raw(BARCODE_EAN8)
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elif bc.upper() == "CODE39":
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self._raw(BARCODE_CODE39)
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elif bc.upper() == "ITF":
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self._raw(BARCODE_ITF)
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elif bc.upper() in ("NW7", "CODABAR"):
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self._raw(BARCODE_NW7)
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else:
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raise BarcodeTypeError()
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# Print Code
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if code:
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self._raw(code)
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else:
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raise BarcodeCodeError()
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def text(self, txt):
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""" Print alpha-numeric text
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The text has to be encoded in the currently selected codepage.
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:param txt: text to be printed
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:raises: TextError
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"""
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if txt:
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self._raw(txt)
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else:
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raise TextError()
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def block_text(self, txt, columns=None):
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'''Text is printed wrapped to specified columns'''
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colCount = self.columns if columns == None else columns
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self.text(textwrap.fill(txt, colCount))
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def set(self, align='left', font='a', text_type='normal', width=1, height=1, density=9):
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""" Set text properties by sending them to the printer
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:param align: alignment of text
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:param font: font A or B
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:param text_type: add bold or underlined
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:param width: text width, normal or double width
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:param height: text height, normal or double height
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:param density: print density
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"""
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# Width
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if height == 2 and width == 2:
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self._raw(TXT_NORMAL)
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self._raw(TXT_4SQUARE)
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elif height == 2 and width != 2:
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self._raw(TXT_NORMAL)
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self._raw(TXT_2HEIGHT)
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elif width == 2 and height != 2:
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self._raw(TXT_NORMAL)
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self._raw(TXT_2WIDTH)
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else: # DEFAULT SIZE: NORMAL
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self._raw(TXT_NORMAL)
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# Type
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if text_type.upper() == "B":
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self._raw(TXT_BOLD_ON)
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self._raw(TXT_UNDERL_OFF)
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elif text_type.upper() == "U":
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self._raw(TXT_BOLD_OFF)
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self._raw(TXT_UNDERL_ON)
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elif text_type.upper() == "U2":
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self._raw(TXT_BOLD_OFF)
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self._raw(TXT_UNDERL2_ON)
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elif text_type.upper() == "BU":
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self._raw(TXT_BOLD_ON)
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self._raw(TXT_UNDERL_ON)
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elif text_type.upper() == "BU2":
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self._raw(TXT_BOLD_ON)
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self._raw(TXT_UNDERL2_ON)
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elif text_type.upper == "NORMAL":
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self._raw(TXT_BOLD_OFF)
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self._raw(TXT_UNDERL_OFF)
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# Font
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if font.upper() == "B":
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self._raw(TXT_FONT_B)
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else: # DEFAULT FONT: A
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self._raw(TXT_FONT_A)
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# Align
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if align.upper() == "CENTER":
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self._raw(TXT_ALIGN_CT)
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elif align.upper() == "RIGHT":
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self._raw(TXT_ALIGN_RT)
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elif align.upper() == "LEFT":
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self._raw(TXT_ALIGN_LT)
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# Density
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if density == 0:
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self._raw(PD_N50)
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elif density == 1:
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self._raw(PD_N37)
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elif density == 2:
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self._raw(PD_N25)
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elif density == 3:
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self._raw(PD_N12)
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elif density == 4:
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self._raw(PD_0)
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elif density == 5:
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self._raw(PD_P12)
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elif density == 6:
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self._raw(PD_P25)
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elif density == 7:
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self._raw(PD_P37)
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elif density == 8:
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self._raw(PD_P50)
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else: # DEFAULT: DOES NOTHING
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pass
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def cut(self, mode=''):
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""" Cut paper
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:param mode: set to 'PART' for a partial cut
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"""
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# Fix the size between last line and cut
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# TODO: handle this with a line feed
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self._raw("\n\n\n\n\n\n")
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if mode.upper() == "PART":
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self._raw(PAPER_PART_CUT)
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else: # DEFAULT MODE: FULL CUT
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self._raw(PAPER_FULL_CUT)
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def cashdraw(self, pin):
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""" Send pulse to kick the cash drawer
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Kick cash drawer on pin 2 or pin 5.
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:param pin: pin number
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:raises: CashDrawerError
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"""
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if pin == 2:
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self._raw(CD_KICK_2)
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elif pin == 5:
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self._raw(CD_KICK_5)
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else:
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raise CashDrawerError()
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def hw(self, hw):
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""" Hardware operations
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:param hw: hardware action
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"""
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if hw.upper() == "INIT":
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self._raw(HW_INIT)
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elif hw.upper() == "SELECT":
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self._raw(HW_SELECT)
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elif hw.upper() == "RESET":
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self._raw(HW_RESET)
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else: # DEFAULT: DOES NOTHING
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pass
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def control(self, ctl, pos=4):
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""" Feed control sequences
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:raises: TabPosError
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"""
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# Set tab positions
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if pos < 1 or pos > 16:
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raise TabPosError()
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else:
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self._raw("".join([CTL_SET_HT, hex(pos)]))
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# Set position
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if ctl.upper() == "LF":
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self._raw(CTL_LF)
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elif ctl.upper() == "FF":
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self._raw(CTL_FF)
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elif ctl.upper() == "CR":
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self._raw(CTL_CR)
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elif ctl.upper() == "HT":
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self._raw(CTL_HT)
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elif ctl.upper() == "VT":
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self._raw(CTL_VT)
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