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REFACTOR style and PEP8, fixes #66

This commit is contained in:
Patrick Kanzler 2015-11-27 21:20:12 +01:00
parent 096445631f
commit 07d8e073ae
5 changed files with 128 additions and 152 deletions
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2
escpos/__init__.py
View File

@ -1 +1 @@
__all__ = ["constants","escpos","exceptions","printer"]
__all__ = ["constants", "escpos", "exceptions", "printer"]

150
escpos/constants.py
View File

@ -1,86 +1,86 @@
""" ESC/POS Commands (Constants) """
# Feed control sequences
CTL_LF = '\x0a' # Print and line feed
CTL_FF = '\x0c' # Form feed
CTL_CR = '\x0d' # Carriage return
CTL_HT = '\x09' # Horizontal tab
CTL_SET_HT = '\x1b\x44' # Set horizontal tab positions
CTL_VT = '\x1b\x64\x04' # Vertical tab
CTL_LF = '\x0a' # Print and line feed
CTL_FF = '\x0c' # Form feed
CTL_CR = '\x0d' # Carriage return
CTL_HT = '\x09' # Horizontal tab
CTL_SET_HT = '\x1b\x44' # Set horizontal tab positions
CTL_VT = '\x1b\x64\x04' # Vertical tab
# Printer hardware
HW_INIT = '\x1b\x40' # Clear data in buffer and reset modes
HW_SELECT = '\x1b\x3d\x01' # Printer select
HW_RESET = '\x1b\x3f\x0a\x00' # Reset printer hardware
HW_INIT = '\x1b\x40' # Clear data in buffer and reset modes
HW_SELECT = '\x1b\x3d\x01' # Printer select
HW_RESET = '\x1b\x3f\x0a\x00' # Reset printer hardware
# Cash Drawer
CD_KICK_2 = '\x1b\x70\x00' # Sends a pulse to pin 2 []
CD_KICK_5 = '\x1b\x70\x01' # Sends a pulse to pin 5 []
CD_KICK_2 = '\x1b\x70\x00' # Sends a pulse to pin 2 []
CD_KICK_5 = '\x1b\x70\x01' # Sends a pulse to pin 5 []
# Paper
PAPER_FULL_CUT = '\x1d\x56\x00' # Full cut paper
PAPER_PART_CUT = '\x1d\x56\x01' # Partial cut paper
PAPER_FULL_CUT = '\x1d\x56\x00' # Full cut paper
PAPER_PART_CUT = '\x1d\x56\x01' # Partial cut paper
# Text format
TXT_NORMAL = '\x1b\x21\x00' # Normal text
TXT_2HEIGHT = '\x1b\x21\x10' # Double height text
TXT_2WIDTH = '\x1b\x21\x20' # Double width text
TXT_4SQUARE = '\x1b\x21\x30' # Quad area text
TXT_UNDERL_OFF = '\x1b\x2d\x00' # Underline font OFF
TXT_UNDERL_ON = '\x1b\x2d\x01' # Underline font 1-dot ON
TXT_UNDERL2_ON = '\x1b\x2d\x02' # Underline font 2-dot ON
TXT_BOLD_OFF = '\x1b\x45\x00' # Bold font OFF
TXT_BOLD_ON = '\x1b\x45\x01' # Bold font ON
TXT_FONT_A = '\x1b\x4d\x00' # Font type A
TXT_FONT_B = '\x1b\x4d\x01' # Font type B
TXT_ALIGN_LT = '\x1b\x61\x00' # Left justification
TXT_ALIGN_CT = '\x1b\x61\x01' # Centering
TXT_ALIGN_RT = '\x1b\x61\x02' # Right justification
TXT_NORMAL = '\x1b\x21\x00' # Normal text
TXT_2HEIGHT = '\x1b\x21\x10' # Double height text
TXT_2WIDTH = '\x1b\x21\x20' # Double width text
TXT_4SQUARE = '\x1b\x21\x30' # Quad area text
TXT_UNDERL_OFF = '\x1b\x2d\x00' # Underline font OFF
TXT_UNDERL_ON = '\x1b\x2d\x01' # Underline font 1-dot ON
TXT_UNDERL2_ON = '\x1b\x2d\x02' # Underline font 2-dot ON
TXT_BOLD_OFF = '\x1b\x45\x00' # Bold font OFF
TXT_BOLD_ON = '\x1b\x45\x01' # Bold font ON
TXT_FONT_A = '\x1b\x4d\x00' # Font type A
TXT_FONT_B = '\x1b\x4d\x01' # Font type B
TXT_ALIGN_LT = '\x1b\x61\x00' # Left justification
TXT_ALIGN_CT = '\x1b\x61\x01' # Centering
TXT_ALIGN_RT = '\x1b\x61\x02' # Right justification
# Char code table
CHARCODE_PC437 = '\x1b\x74\x00' # USA: Standard Europe
CHARCODE_JIS = '\x1b\x74\x01' # Japanese Katakana
CHARCODE_PC850 = '\x1b\x74\x02' # Multilingual
CHARCODE_PC860 = '\x1b\x74\x03' # Portuguese
CHARCODE_PC863 = '\x1b\x74\x04' # Canadian-French
CHARCODE_PC865 = '\x1b\x74\x05' # Nordic
CHARCODE_WEU = '\x1b\x74\x06' # Simplified Kanji, Hirakana
CHARCODE_GREEK = '\x1b\x74\x07' # Simplified Kanji
CHARCODE_HEBREW = '\x1b\x74\x08' # Simplified Kanji
CHARCODE_PC1252 = '\x1b\x74\x11' # Western European Windows Code Set
CHARCODE_PC866 = '\x1b\x74\x12' # Cirillic #2
CHARCODE_PC852 = '\x1b\x74\x13' # Latin 2
CHARCODE_PC858 = '\x1b\x74\x14' # Euro
CHARCODE_THAI42 = '\x1b\x74\x15' # Thai character code 42
CHARCODE_THAI11 = '\x1b\x74\x16' # Thai character code 11
CHARCODE_THAI13 = '\x1b\x74\x17' # Thai character code 13
CHARCODE_THAI14 = '\x1b\x74\x18' # Thai character code 14
CHARCODE_THAI16 = '\x1b\x74\x19' # Thai character code 16
CHARCODE_THAI17 = '\x1b\x74\x1a' # Thai character code 17
CHARCODE_THAI18 = '\x1b\x74\x1b' # Thai character code 18
CHARCODE_PC437 = '\x1b\x74\x00' # USA: Standard Europe
CHARCODE_JIS = '\x1b\x74\x01' # Japanese Katakana
CHARCODE_PC850 = '\x1b\x74\x02' # Multilingual
CHARCODE_PC860 = '\x1b\x74\x03' # Portuguese
CHARCODE_PC863 = '\x1b\x74\x04' # Canadian-French
CHARCODE_PC865 = '\x1b\x74\x05' # Nordic
CHARCODE_WEU = '\x1b\x74\x06' # Simplified Kanji, Hirakana
CHARCODE_GREEK = '\x1b\x74\x07' # Simplified Kanji
CHARCODE_HEBREW = '\x1b\x74\x08' # Simplified Kanji
CHARCODE_PC1252 = '\x1b\x74\x11' # Western European Windows Code Set
CHARCODE_PC866 = '\x1b\x74\x12' # Cirillic #2
CHARCODE_PC852 = '\x1b\x74\x13' # Latin 2
CHARCODE_PC858 = '\x1b\x74\x14' # Euro
CHARCODE_THAI42 = '\x1b\x74\x15' # Thai character code 42
CHARCODE_THAI11 = '\x1b\x74\x16' # Thai character code 11
CHARCODE_THAI13 = '\x1b\x74\x17' # Thai character code 13
CHARCODE_THAI14 = '\x1b\x74\x18' # Thai character code 14
CHARCODE_THAI16 = '\x1b\x74\x19' # Thai character code 16
CHARCODE_THAI17 = '\x1b\x74\x1a' # Thai character code 17
CHARCODE_THAI18 = '\x1b\x74\x1b' # Thai character code 18
# Barcode format
BARCODE_TXT_OFF = '\x1d\x48\x00' # HRI barcode chars OFF
BARCODE_TXT_ABV = '\x1d\x48\x01' # HRI barcode chars above
BARCODE_TXT_BLW = '\x1d\x48\x02' # HRI barcode chars below
BARCODE_TXT_BTH = '\x1d\x48\x03' # HRI barcode chars both above and below
BARCODE_FONT_A = '\x1d\x66\x00' # Font type A for HRI barcode chars
BARCODE_FONT_B = '\x1d\x66\x01' # Font type B for HRI barcode chars
BARCODE_HEIGHT = '\x1d\x68\x64' # Barcode Height [1-255]
BARCODE_WIDTH = '\x1d\x77\x03' # Barcode Width [2-6]
BARCODE_UPC_A = '\x1d\x6b\x00' # Barcode type UPC-A
BARCODE_UPC_E = '\x1d\x6b\x01' # Barcode type UPC-E
BARCODE_EAN13 = '\x1d\x6b\x02' # Barcode type EAN13
BARCODE_EAN8 = '\x1d\x6b\x03' # Barcode type EAN8
BARCODE_CODE39 = '\x1d\x6b\x04' # Barcode type CODE39
BARCODE_ITF = '\x1d\x6b\x05' # Barcode type ITF
BARCODE_NW7 = '\x1d\x6b\x06' # Barcode type NW7
BARCODE_TXT_OFF = '\x1d\x48\x00' # HRI barcode chars OFF
BARCODE_TXT_ABV = '\x1d\x48\x01' # HRI barcode chars above
BARCODE_TXT_BLW = '\x1d\x48\x02' # HRI barcode chars below
BARCODE_TXT_BTH = '\x1d\x48\x03' # HRI barcode chars both above and below
BARCODE_FONT_A = '\x1d\x66\x00' # Font type A for HRI barcode chars
BARCODE_FONT_B = '\x1d\x66\x01' # Font type B for HRI barcode chars
BARCODE_HEIGHT = '\x1d\x68\x64' # Barcode Height [1-255]
BARCODE_WIDTH = '\x1d\x77\x03' # Barcode Width [2-6]
BARCODE_UPC_A = '\x1d\x6b\x00' # Barcode type UPC-A
BARCODE_UPC_E = '\x1d\x6b\x01' # Barcode type UPC-E
BARCODE_EAN13 = '\x1d\x6b\x02' # Barcode type EAN13
BARCODE_EAN8 = '\x1d\x6b\x03' # Barcode type EAN8
BARCODE_CODE39 = '\x1d\x6b\x04' # Barcode type CODE39
BARCODE_ITF = '\x1d\x6b\x05' # Barcode type ITF
BARCODE_NW7 = '\x1d\x6b\x06' # Barcode type NW7
# Image format
S_RASTER_N = '\x1d\x76\x30\x00' # Set raster image normal size
S_RASTER_2W = '\x1d\x76\x30\x01' # Set raster image double width
S_RASTER_2H = '\x1d\x76\x30\x02' # Set raster image double height
S_RASTER_Q = '\x1d\x76\x30\x03' # Set raster image quadruple
S_RASTER_N = '\x1d\x76\x30\x00' # Set raster image normal size
S_RASTER_2W = '\x1d\x76\x30\x01' # Set raster image double width
S_RASTER_2H = '\x1d\x76\x30\x02' # Set raster image double height
S_RASTER_Q = '\x1d\x76\x30\x03' # Set raster image quadruple
# Printing Density
PD_N50 = '\x1d\x7c\x00' # Printing Density -50%
PD_N37 = '\x1d\x7c\x01' # Printing Density -37.5%
PD_N25 = '\x1d\x7c\x02' # Printing Density -25%
PD_N12 = '\x1d\x7c\x03' # Printing Density -12.5%
PD_0 = '\x1d\x7c\x04' # Printing Density 0%
PD_P50 = '\x1d\x7c\x08' # Printing Density +50%
PD_P37 = '\x1d\x7c\x07' # Printing Density +37.5%
PD_P25 = '\x1d\x7c\x06' # Printing Density +25%
PD_P12 = '\x1d\x7c\x05' # Printing Density +12.5%
PD_N50 = '\x1d\x7c\x00' # Printing Density -50%
PD_N37 = '\x1d\x7c\x01' # Printing Density -37.5%
PD_N25 = '\x1d\x7c\x02' # Printing Density -25%
PD_N12 = '\x1d\x7c\x03' # Printing Density -12.5%
PD_0 = '\x1d\x7c\x04' # Printing Density 0%
PD_P50 = '\x1d\x7c\x08' # Printing Density +50%
PD_P37 = '\x1d\x7c\x07' # Printing Density +37.5%
PD_P25 = '\x1d\x7c\x06' # Printing Density +25%
PD_P12 = '\x1d\x7c\x05' # Printing Density +12.5%

88
escpos/escpos.py
View File

@ -12,41 +12,40 @@ except ImportError:
from PIL import Image
import qrcode
import time
from constants import *
from exceptions import *
class Escpos(object):
""" ESC/POS Printer object """
device = None
device = None
def _check_image_size(self, size):
@staticmethod
def _check_image_size(size):
""" Check and fix the size of the image to 32 bits """
if size % 32 == 0:
return (0, 0)
return 0, 0
else:
image_border = 32 - (size % 32)
if (image_border % 2) == 0:
return (image_border / 2, image_border / 2)
return image_border / 2, image_border / 2
else:
return (image_border / 2, (image_border / 2) + 1)
return image_border / 2, (image_border / 2) + 1
def _print_image(self, line, size):
""" Print formatted image """
i = 0
cont = 0
buffer = ""
self._raw(S_RASTER_N)
buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1]&0xff, size[1]>>8)
buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1] & 0xff, size[1] >> 8)
self._raw(buffer.decode('hex'))
buffer = ""
while i < len(line):
hex_string = int(line[i:i+8],2)
hex_string = int(line[i:i+8], 2)
buffer += "%02X" % hex_string
i += 8
cont += 1
@ -55,19 +54,17 @@ class Escpos(object):
buffer = ""
cont = 0
def _convert_image(self, im):
""" Parse image and prepare it to a printable format """
pixels = []
pixels = []
pix_line = ""
im_left = ""
im_left = ""
im_right = ""
switch = 0
img_size = [ 0, 0 ]
switch = 0
img_size = [0, 0]
if im.size[0] > 512:
print ("WARNING: Image is wider than 512 and could be truncated at print time ")
print ("WARNING: Image is wider than 512 and could be truncated at print time ")
if im.size[1] > 0xffff:
raise ImageSizeError()
@ -87,7 +84,7 @@ class Escpos(object):
im_color = (RGB[0] + RGB[1] + RGB[2])
im_pattern = "1X0"
pattern_len = len(im_pattern)
switch = (switch - 1 ) * (-1)
switch = (switch - 1) * (-1)
for x in range(pattern_len):
if im_color <= (255 * 3 / pattern_len * (x+1)):
if im_pattern[x] == "X":
@ -97,30 +94,28 @@ class Escpos(object):
break
elif (255 * 3 / pattern_len * pattern_len) < im_color <= (255 * 3):
pix_line += im_pattern[-1]
break
break
pix_line += im_right
img_size[0] += im_border[1]
self._print_image(pix_line, img_size)
def image(self,path_img):
def image(self, path_img):
""" Open image file """
im_open = Image.open(path_img)
# Remove the alpha channel on transparent images
if im_open.mode == 'RGBA':
im_open.load()
im = Image.new("RGB", im_open.size, (255, 255, 255))
im.paste(im_open, mask=im_open.split()[3])
else:
im = im_open.convert("RGB")
# Remove the alpha channel on transparent images
if im_open.mode == 'RGBA':
im_open.load()
im = Image.new("RGB", im_open.size, (255, 255, 255))
im.paste(im_open, mask=im_open.split()[3])
else:
im = im_open.convert("RGB")
# Convert the RGB image in printable image
self._convert_image(im)
def qr(self,text):
def qr(self, text):
""" Print QR Code for the provided string """
qr_code = qrcode.QRCode(version=4, box_size=4, border=1)
qr_code.add_data(text)
@ -131,8 +126,7 @@ class Escpos(object):
# Convert the RGB image in printable image
self._convert_image(im)
def charcode(self,code):
def charcode(self, code):
""" Set Character Code Table """
if code.upper() == "USA":
self._raw(CHARCODE_PC437)
@ -184,19 +178,19 @@ class Escpos(object):
# Align Bar Code()
self._raw(TXT_ALIGN_CT)
# Height
if height >=2 or height <=6:
if height >= 2 or height <= 6:
self._raw(BARCODE_HEIGHT)
else:
raise BarcodeSizeError()
# Width
if width >= 1 or width <=255:
if width >= 1 or width <= 255:
self._raw(BARCODE_WIDTH)
else:
raise BarcodeSizeError()
# Font
if font.upper() == "B":
self._raw(BARCODE_FONT_B)
else: # DEFAULT FONT: A
else: # DEFAULT FONT: A
self._raw(BARCODE_FONT_A)
# Position
if pos.upper() == "OFF":
@ -205,9 +199,9 @@ class Escpos(object):
self._raw(BARCODE_TXT_BTH)
elif pos.upper() == "ABOVE":
self._raw(BARCODE_TXT_ABV)
else: # DEFAULT POSITION: BELOW
else: # DEFAULT POSITION: BELOW
self._raw(BARCODE_TXT_BLW)
# Type
# Type
if bc.upper() == "UPC-A":
self._raw(BARCODE_UPC_A)
elif bc.upper() == "UPC-E":
@ -228,9 +222,8 @@ class Escpos(object):
if code:
self._raw(code)
else:
raise exception.BarcodeCodeError()
raise BarcodeCodeError()
def text(self, txt):
""" Print alpha-numeric text """
if txt:
@ -238,7 +231,6 @@ class Escpos(object):
else:
raise TextError()
def set(self, align='left', font='a', type='normal', width=1, height=1, density=9):
""" Set text properties """
# Width
@ -251,7 +243,7 @@ class Escpos(object):
elif width == 2 and height != 2:
self._raw(TXT_NORMAL)
self._raw(TXT_2WIDTH)
else: # DEFAULT SIZE: NORMAL
else: # DEFAULT SIZE: NORMAL
self._raw(TXT_NORMAL)
# Type
if type.upper() == "B":
@ -303,10 +295,9 @@ class Escpos(object):
self._raw(PD_P37)
elif density == 8:
self._raw(PD_P50)
else:# DEFAULT: DOES NOTHING
else: # DEFAULT: DOES NOTHING
pass
def cut(self, mode=''):
""" Cut paper """
# Fix the size between last line and cut
@ -314,10 +305,9 @@ class Escpos(object):
self._raw("\n\n\n\n\n\n")
if mode.upper() == "PART":
self._raw(PAPER_PART_CUT)
else: # DEFAULT MODE: FULL CUT
else: # DEFAULT MODE: FULL CUT
self._raw(PAPER_FULL_CUT)
def cashdraw(self, pin):
""" Send pulse to kick the cash drawer """
if pin == 2:
@ -327,7 +317,6 @@ class Escpos(object):
else:
raise CashDrawerError()
def hw(self, hw):
""" Hardware operations """
if hw.upper() == "INIT":
@ -336,17 +325,16 @@ class Escpos(object):
self._raw(HW_SELECT)
elif hw.upper() == "RESET":
self._raw(HW_RESET)
else: # DEFAULT: DOES NOTHING
else: # DEFAULT: DOES NOTHING
pass
def control(self, ctl, pos=4):
""" Feed control sequences """
# Set tab positions
if pos < 1 or pos > 16:
raise TabError()
else:
self._raw("".join([CTL_SET_HT,hex(pos)]))
self._raw("".join([CTL_SET_HT, hex(pos)]))
# Set position
if ctl.upper() == "LF":
self._raw(CTL_LF)

5
escpos/exceptions.py
View File

@ -1,6 +1,5 @@
""" ESC/POS Exceptions classes """
import os
class Error(Exception):
""" Base class for ESC/POS errors """
@ -35,6 +34,7 @@ class BarcodeTypeError(Error):
def __str__(self):
return "No Barcode type is defined"
class BarcodeSizeError(Error):
def __init__(self, msg=""):
Error.__init__(self, msg)
@ -44,6 +44,7 @@ class BarcodeSizeError(Error):
def __str__(self):
return "Barcode size is out of range"
class BarcodeCodeError(Error):
def __init__(self, msg=""):
Error.__init__(self, msg)
@ -53,6 +54,7 @@ class BarcodeCodeError(Error):
def __str__(self):
return "Code was not supplied"
class ImageSizeError(Error):
def __init__(self, msg=""):
Error.__init__(self, msg)
@ -62,6 +64,7 @@ class ImageSizeError(Error):
def __str__(self):
return "Image height is longer than 255px and can't be printed"
class TextError(Error):
def __init__(self, msg=""):
Error.__init__(self, msg)

35
escpos/printer.py
View File

@ -12,9 +12,9 @@ import serial
import socket
from escpos import *
from constants import *
from exceptions import *
class Usb(Escpos):
""" Define USB printer """
@ -26,14 +26,13 @@ class Usb(Escpos):
@param in_ep : Input end point
@param out_ep : Output end point
"""
self.idVendor = idVendor
self.idVendor = idVendor
self.idProduct = idProduct
self.interface = interface
self.in_ep = in_ep
self.out_ep = out_ep
self.in_ep = in_ep
self.out_ep = out_ep
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)
@ -52,7 +51,7 @@ class Usb(Escpos):
self.device.detach_kernel_driver(0)
except usb.core.USBError as e:
if check_driver is not None:
print "Could not detatch kernel driver: %s" % str(e)
print "Could not detach kernel driver: %s" % str(e)
try:
self.device.set_configuration()
@ -60,12 +59,10 @@ class Usb(Escpos):
except usb.core.USBError as e:
print "Could not set configuration: %s" % str(e)
def _raw(self, msg):
""" Print any command sent in raw format """
self.device.write(self.out_ep, msg, self.interface)
def __del__(self):
""" Release USB interface """
if self.device:
@ -73,13 +70,12 @@ class Usb(Escpos):
self.device = None
class Serial(Escpos):
""" Define Serial printer """
def __init__(self, devfile="/dev/ttyS0", baudrate=9600, bytesize=8, timeout=1,
parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE,
xonxoff=False , dsrdtr=True):
xonxoff=False, dsrdtr=True):
"""
@param devfile : Device file under dev filesystem
@param baudrate : Baud rate for serial transmission
@ -91,10 +87,10 @@ class Serial(Escpos):
@param xonxoff : Software flow control
@param dsrdtr : Hardware flow control (False to enable RTS/CTS)
"""
self.devfile = devfile
self.devfile = devfile
self.baudrate = baudrate
self.bytesize = bytesize
self.timeout = timeout
self.timeout = timeout
self.parity = parity
self.stopbits = stopbits
@ -103,7 +99,6 @@ class Serial(Escpos):
self.open()
def open(self):
""" Setup serial port and set is as escpos device """
self.device = serial.Serial(port=self.devfile, baudrate=self.baudrate,
@ -116,23 +111,20 @@ class Serial(Escpos):
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):
def __init__(self, host, port=9100):
"""
@param host : Printer's hostname or IP address
@param port : Port to write to
@ -141,7 +133,6 @@ class Network(Escpos):
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)
@ -150,18 +141,15 @@ class Network(Escpos):
if self.device is None:
print "Could not open socket for %s" % self.host
def _raw(self, msg):
""" Print any command sent in raw format """
self.device.send(msg)
def __del__(self):
""" Close TCP connection """
self.device.close()
class File(Escpos):
""" Define Generic file printer """
@ -172,7 +160,6 @@ class File(Escpos):
self.devfile = devfile
self.open()
def open(self):
""" Open system file """
self.device = open(self.devfile, "wb")
@ -180,11 +167,9 @@ class File(Escpos):
if self.device is None:
print "Could not open the specified file %s" % self.devfile
def _raw(self, msg):
""" Print any command sent in raw format """
self.device.write(msg);
self.device.write(msg)
def __del__(self):
""" Close system file """