Added Network and Serial support
This commit is contained in:
Manuel F Martinez
parent
e9effc23da
commit
3760788cfe
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@ -1 +1 @@
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__all__ = ["constants","escpos","exceptions"]
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__all__ = ["constants","escpos","exceptions","printer"]
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71
escpos.py
71
escpos.py
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@ -2,66 +2,23 @@
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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) 2010 Bashlinux
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@copyright: Copyright (c) 2012 Bashlinux
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@license: GPL
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'''
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import usb.core
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import usb.util
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import Image
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import time
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from constants import *
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from exceptions import *
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class DeviceDescriptor:
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""" Search device on USB tree and return it if found """
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def __init__(self, idVendor, idProduct, interface) :
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self.idVendor = idVendor
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self.idProduct = idProduct
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self.interface = interface
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def get_device(self) :
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device = usb.core.find(idVendor=self.idVendor, idProduct=self.idProduct)
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return device
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class Escpos:
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""" ESC/POS Printer object """
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handle = None
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device = None
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def __init__(self, idVendor, idProduct, interface=0, in_ep=0x82, out_ep=0x01) :
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self.idVendor = idVendor
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self.idProduct = idProduct
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self.interface = interface
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self.in_ep = in_ep
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self.out_ep = out_ep
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device_descriptor = DeviceDescriptor(self.idVendor, self.idProduct, self.interface)
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self.device = device_descriptor.get_device()
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if self.device is None:
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print "Cable isn't plugged in"
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if self.device.is_kernel_driver_active(0):
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try:
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self.device.detach_kernel_driver(0)
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except usb.core.USBError as e:
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print "Could not detatch kernel driver: %s" % str(e)
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try:
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self.device.set_configuration()
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self.device.reset()
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except usb.core.USBError as e:
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print "Could not set configuration: %s" % str(e)
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def _raw(self, msg):
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""" Print any of the commands above, or clear text """
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self.device.write(self.out_ep, msg, self.interface)
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def _check_image_size(self, size):
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"""Check and fix the size of the image to 32 bits"""
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""" Check and fix the size of the image to 32 bits """
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if size % 32 == 0:
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return (0, 0)
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else:
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@ -73,6 +30,7 @@ class Escpos:
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def _print_image(self, line, size):
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""" Print formatted image """
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i = 0
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cont = 0
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buffer = ""
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@ -94,7 +52,7 @@ class Escpos:
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def image(self, img):
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"""Parse image and then print it"""
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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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@ -294,23 +252,4 @@ class Escpos:
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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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def __del__(self):
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""" Release device interface """
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if self.handle:
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try:
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self.handle.releaseInterface()
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self.handle.resetEndpoint(self.out_ep)
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self.handle.reset()
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except Exception, err:
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print err
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self.handle, self.device = None, None
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# Give a chance to return the interface to the system
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# The following message could appear if the application is executed
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# too fast twice or more times.
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#
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# >> could not detach kernel driver from interface 0: No data available
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# >> No interface claimed
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time.sleep(1)
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delf._raw(CTL_VT)
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@ -0,0 +1,136 @@
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#!/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: GPL
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'''
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import usb.core
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import usb.util
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import serial
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import socket
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from escpos import *
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from constants import *
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from exceptions import *
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class Usb(Escpos):
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""" Define USB printer """
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def __init__(self, idVendor, idProduct, interface=0, in_ep=0x82, out_ep=0x01):
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"""
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@param idVendor : Vendor ID
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@param idProduct : Product ID
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@param interface : USB device interface
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@param in_ep : Input end point
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@param out_ep : Output end point
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"""
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self.idVendor = idVendor
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self.idProduct = idProduct
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self.interface = interface
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self.in_ep = in_ep
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self.out_ep = out_ep
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self.open()
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def open(self):
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""" Search device on USB tree and set is as escpos device """
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self.device = usb.core.find(idVendor=self.idVendor, idProduct=self.idProduct)
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if self.device is None:
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print "Cable isn't plugged in"
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if self.device.is_kernel_driver_active(0):
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try:
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self.device.detach_kernel_driver(0)
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except usb.core.USBError as e:
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print "Could not detatch kernel driver: %s" % str(e)
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try:
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self.device.set_configuration()
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self.device.reset()
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except usb.core.USBError as e:
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print "Could not set configuration: %s" % str(e)
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def _raw(self, msg):
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""" Print any command sent in raw format """
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self.device.write(self.out_ep, msg, self.interface)
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def __del__(self):
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""" Release USB interface """
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if self.device:
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usb.util.dispose_resources(self.device)
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self.device = None
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class Serial(Escpos):
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""" Define Serial printer """
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def __init__(self, devfile="/dev/ttyUSB0", baudrate=9600, bytesize=8, timeout=5):
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"""
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@param devfile : Device file under dev filesystem
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@param baudrate : Baud rate for serial transmission
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@param timeout : Read/Write timeout
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@param bytesize : Serial buffer size
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"""
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self.devfile = devfile
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self.baudrate = baudrate
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self.bytesize = bytesize
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self.timeout = timeout
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self.open()
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def open(self):
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""" Setup serial port and set is as escpos device """
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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)
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if self.device is not None:
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print "Serial printer enabled"
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else:
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print "Unable to open serial printer on: %s" % self.devfile
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def _raw(self, msg):
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""" Print any command sent in raw format """
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self.device.write(msg)
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def __del__(self):
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""" Close Serial interface """
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if self.device is not None:
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self.device.close()
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class Network(Escpos):
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""" Define Network printer """
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def __init__(self,host,port=9100):
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"""
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@param host : Printer's hostname or IP address
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@param port : Port to write to
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"""
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self.host = host
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self.port = port
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self.open()
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def open(self):
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""" Open TCP socket and set it as escpos device """
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self.device = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.device.connect((self.host, self.port))
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if self.device is None:
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print "Could not open socket for %s" % self.host
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def _raw(self, msg):
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self.device.send(msg)
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def __del__(self):
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""" Close TCP connection """
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self.device.close()
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