setop/python-escpos
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Merge 0dacc35d940e4c8ed09cacb8e1ab25b5a2b9fe08 into c3fbdf28d4c57ed1a4bc7413fe083dd97dd91657

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This commit is contained in:
Patrick Kanzler 2015-12-27 18:03:38 +00:00
commit c13fcbc0cb
8 changed files with 254 additions and 190 deletions
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3
.hgignore → .gitignore vendored
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@ -1,10 +1,9 @@
# python temporary files
syntax: glob
*.pyc
# editor autosaves
$~
.idea/
# temporary data
syntax: regexp
temp

2
escpos/__init__.py
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@ -1 +1 @@
__all__ = ["constants","escpos","exceptions","printer"]
__all__ = ["constants", "escpos", "exceptions", "printer"]

174
escpos/escpos.py
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@ -12,59 +12,82 @@ except ImportError:
from PIL import Image
import qrcode
import time
from constants import *
from exceptions import *
class Escpos:
from abc import ABCMeta, abstractmethod # abstract base class support
class Escpos(object):
""" ESC/POS Printer object """
__metaclass__ = ABCMeta
device = None
@abstractmethod
def _raw(self, msg):
""" Sends raw data to the printer
def _check_image_size(self, size):
""" Check and fix the size of the image to 32 bits """
This function has to be individually implemented by the implementations.
:param msg: message string to be sent to the printer
"""
pass
@staticmethod
def _check_image_size(size):
""" Check and fix the size of the image to 32 bits
:param size: size of the image
:returns: tuple of image borders
:rtype: (int, int)
"""
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)
# TODO check behaviour of / in newer versions of python
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 """
""" Print formatted image
:param line:
:param size:
"""
i = 0
cont = 0
buffer = ""
pbuffer = ""
self._raw(S_RASTER_N)
buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1]&0xff, size[1]>>8)
self._raw(buffer.decode('hex'))
buffer = ""
pbuffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1] & 0xff, size[1] >> 8)
self._raw(pbuffer.decode('hex'))
pbuffer = ""
while i < len(line):
hex_string = int(line[i:i+8],2)
buffer += "%02X" % hex_string
hex_string = int(line[i:i+8], 2)
pbuffer += "%02X" % hex_string
i += 8
cont += 1
if cont % 4 == 0:
self._raw(buffer.decode("hex"))
buffer = ""
self._raw(pbuffer.decode("hex"))
pbuffer = ""
cont = 0
def _convert_image(self, im):
""" Parse image and prepare it to a printable format """
""" Parse image and prepare it to a printable format
:param im: image data
:raises: ImageSizeError
"""
pixels = []
pix_line = ""
im_left = ""
im_right = ""
switch = 0
img_size = [ 0, 0 ]
img_size = [0, 0]
if im.size[0] > 512:
print ("WARNING: Image is wider than 512 and could be truncated at print time ")
@ -87,7 +110,7 @@ class Escpos:
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":
@ -95,7 +118,7 @@ class Escpos:
else:
pix_line += im_pattern[x]
break
elif im_color > (255 * 3 / pattern_len * pattern_len) and im_color <= (255 * 3):
elif (255 * 3 / pattern_len * pattern_len) < im_color <= (255 * 3):
pix_line += im_pattern[-1]
break
pix_line += im_right
@ -103,9 +126,11 @@ class Escpos:
self._print_image(pix_line, img_size)
def image(self, path_img):
""" Open image file
def image(self,path_img):
""" Open image file """
:param path_img: path to image
"""
im_open = Image.open(path_img)
# Remove the alpha channel on transparent images
@ -119,9 +144,11 @@ class Escpos:
# Convert the RGB image in printable image
self._convert_image(im)
def qr(self, text):
""" Print QR Code for the provided string
def qr(self,text):
""" Print QR Code for the provided string """
:param text: text to generate a QR-Code from
"""
qr_code = qrcode.QRCode(version=4, box_size=4, border=1)
qr_code.add_data(text)
qr_code.make(fit=True)
@ -131,9 +158,14 @@ class Escpos:
# Convert the RGB image in printable image
self._convert_image(im)
def charcode(self, code):
""" Set Character Code Table
def charcode(self,code):
""" Set Character Code Table """
Sends the control sequence from constants.py to the printer with :py:meth:`escpos.printer._raw()`.
:param code: Name of CharCode
:raises: CharCodeError
"""
if code.upper() == "USA":
self._raw(CHARCODE_PC437)
elif code.upper() == "JIS":
@ -152,8 +184,8 @@ class Escpos:
self._raw(CHARCODE_GREEK)
elif code.upper() == "HEBREW":
self._raw(CHARCODE_HEBREW)
elif code.upper() == "LATVIAN":
self._raw(CHARCODE_PC755)
# elif code.upper() == "LATVIAN": # this is not listed in the constants
# self._raw(CHARCODE_PC755)
elif code.upper() == "WPC1252":
self._raw(CHARCODE_PC1252)
elif code.upper() == "CIRILLIC2":
@ -180,16 +212,25 @@ class Escpos:
raise CharCodeError()
def barcode(self, code, bc, width, height, pos, font):
""" Print Barcode """
""" Print Barcode
:param code: data for barcode
:param bc: barcode format, see constants.py
:param width: barcode width, has to be between 1 and 255
:param height: barcode height, has to be between 2 and 6
:param pos: position of text in barcode, default when nothing supplied is below
:param font: select font, default is font A
:raises: BarcodeSizeError, BarcodeTypeError, BarcodeCodeError
"""
# 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()
@ -228,19 +269,30 @@ class Escpos:
if code:
self._raw(code)
else:
raise exception.BarcodeCodeError()
raise BarcodeCodeError()
def text(self, txt):
""" Print alpha-numeric text """
""" Print alpha-numeric text
The text has to be encoded in the currently selected codepage.
:param txt: text to be printed
:raises: TextError
"""
if txt:
self._raw(txt)
else:
raise TextError()
def set(self, align='left', font='a', text_type='normal', width=1, height=1, density=9):
""" Set text properties by sending them to the printer
def set(self, align='left', font='a', type='normal', width=1, height=1, density=9):
""" Set text properties """
:param align: alignment of text
:param font: font A or B
:param text_type: add bold or underlined
:param width: text width, normal or double width
:param height: text height, normal or double height
:param density: print density
"""
# Width
if height == 2 and width == 2:
self._raw(TXT_NORMAL)
@ -254,22 +306,22 @@ class Escpos:
else: # DEFAULT SIZE: NORMAL
self._raw(TXT_NORMAL)
# Type
if type.upper() == "B":
if text_type.upper() == "B":
self._raw(TXT_BOLD_ON)
self._raw(TXT_UNDERL_OFF)
elif type.upper() == "U":
elif text_type.upper() == "U":
self._raw(TXT_BOLD_OFF)
self._raw(TXT_UNDERL_ON)
elif type.upper() == "U2":
elif text_type.upper() == "U2":
self._raw(TXT_BOLD_OFF)
self._raw(TXT_UNDERL2_ON)
elif type.upper() == "BU":
elif text_type.upper() == "BU":
self._raw(TXT_BOLD_ON)
self._raw(TXT_UNDERL_ON)
elif type.upper() == "BU2":
elif text_type.upper() == "BU2":
self._raw(TXT_BOLD_ON)
self._raw(TXT_UNDERL2_ON)
elif type.upper == "NORMAL":
elif text_type.upper == "NORMAL":
self._raw(TXT_BOLD_OFF)
self._raw(TXT_UNDERL_OFF)
# Font
@ -303,12 +355,14 @@ class Escpos:
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 """
""" Cut paper
:param mode: set to 'PART' for a partial cut
"""
# Fix the size between last line and cut
# TODO: handle this with a line feed
self._raw("\n\n\n\n\n\n")
@ -317,9 +371,13 @@ class Escpos:
else: # DEFAULT MODE: FULL CUT
self._raw(PAPER_FULL_CUT)
def cashdraw(self, pin):
""" Send pulse to kick the cash drawer """
""" Send pulse to kick the cash drawer
Kick cash drawer on pin 2 or pin 5.
:param pin: pin number
:raises: CashDrawerError
"""
if pin == 2:
self._raw(CD_KICK_2)
elif pin == 5:
@ -327,9 +385,11 @@ class Escpos:
else:
raise CashDrawerError()
def hw(self, hw):
""" Hardware operations """
""" Hardware operations
:param hw: hardware action
"""
if hw.upper() == "INIT":
self._raw(HW_INIT)
elif hw.upper() == "SELECT":
@ -339,14 +399,16 @@ class Escpos:
else: # DEFAULT: DOES NOTHING
pass
def control(self, ctl, pos=4):
""" Feed control sequences """
""" Feed control sequences
:raises: TabPosError
"""
# Set tab positions
if pos < 1 or pos > 16:
raise TabError()
raise TabPosError()
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)

17
escpos/exceptions.py
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@ -1,6 +1,5 @@
""" ESC/POS Exceptions classes """
import os
class Error(Exception):
""" Base class for ESC/POS errors """
@ -27,6 +26,7 @@ class Error(Exception):
class BarcodeTypeError(Error):
"""No Barcode type defined """
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
@ -35,7 +35,9 @@ class BarcodeTypeError(Error):
def __str__(self):
return "No Barcode type is defined"
class BarcodeSizeError(Error):
""" Barcode size is out of range """
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
@ -44,16 +46,20 @@ class BarcodeSizeError(Error):
def __str__(self):
return "Barcode size is out of range"
class BarcodeCodeError(Error):
""" No Barcode code was supplied """
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 30
def __str__(self):
return "Code was not supplied"
return "No Barcode code was supplied"
class ImageSizeError(Error):
""" Image height is longer than 255px and can't be printed """
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
@ -62,7 +68,9 @@ class ImageSizeError(Error):
def __str__(self):
return "Image height is longer than 255px and can't be printed"
class TextError(Error):
""" Test sting must be supplied to the text() method """
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
@ -73,6 +81,7 @@ class TextError(Error):
class CashDrawerError(Error):
""" Valid pin must be set to send pulse """
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
@ -82,7 +91,8 @@ class CashDrawerError(Error):
return "Valid pin must be set to send pulse"
class TabError(Error):
class TabPosError(Error):
""" Valid tab positions must be in the range 0 to 16 """
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
@ -93,6 +103,7 @@ class TabError(Error):
class CharCodeError(Error):
""" Valid char code must be set """
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg

37
escpos/printer.py
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@ -12,19 +12,19 @@ import serial
import socket
from escpos import *
from constants import *
from exceptions import *
class Usb(Escpos):
""" Define USB printer """
def __init__(self, idVendor, idProduct, interface=0, in_ep=0x82, out_ep=0x01):
"""
@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
: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.idVendor = idVendor
self.idProduct = idProduct
@ -33,9 +33,8 @@ class Usb(Escpos):
self.out_ep = out_ep
self.open()
def open(self):
""" Search device on USB tree and set is as escpos device """
""" Search device on USB tree and set it as escpos device """
self.device = usb.core.find(idVendor=self.idVendor, idProduct=self.idProduct)
if self.device is None:
print "Cable isn't plugged in"
@ -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
@ -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 """

1
requirements.txt Normal file
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@ -0,0 +1 @@
-e .

8
setup.py
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@ -23,7 +23,13 @@ setup(
'Operating System :: GNU/Linux',
'Intended Audience :: Developers',
'Programming Language :: Python',
'Topic :: System :: Pheripherals',
'Topic :: System :: Peripherals',
'Topic :: Software Development :: Libraries :: Python Modules',
],
install_requires=[
'pyusb',
'Pillow>=2.0',
'qrcode>=4.0',
'pyserial',
],
)