Merge 940306295c2aca973d87fe51f1e99d6c321d92e7 into d93e76e9040197da47832d88155940b5caa9bbfe
This commit is contained in:
William Rogers
commit
e664ceba1b
49
escpos/escpos.py
Normal file → Executable file
49
escpos/escpos.py
Normal file → Executable file
@ -20,7 +20,7 @@ from exceptions import *
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class Escpos:
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""" ESC/POS Printer object """
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device = None
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img_cache = []
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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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@ -33,6 +33,38 @@ class Escpos:
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else:
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return (image_border / 2, (image_border / 2) + 1)
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def cache_image(self, path_img):
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""" Open image file and store in the printer's cache """
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img_no = len(self.img_cache)
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im_open = Image.open(path_img)
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im = im_open.convert("RGB")
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# Convert the RGB image into printable image
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(pix_line, img_size) = self._convert_image(im)
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# Convert the buffered data directly to the printer readable format
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cache = ""
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buffer = ""
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i = 0
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cont = 0
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buffer = "%02X%02X%02X%02X" % (((img_size[0]/img_size[1])/8), 0, img_size[1], 0)
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cache = buffer.decode('hex')
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buffer = ""
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while i < len(pix_line):
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hex_string = int(pix_line[i:i+8],2)
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buffer += "%02X" % hex_string
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i += 8
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cont += 1
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if cont % 4 == 0:
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cache += buffer.decode("hex")
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buffer = ""
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cont = 0
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self.img_cache.append(cache)
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return img_no
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def _print_image(self, line, size):
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""" Print formatted image """
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@ -101,16 +133,21 @@ class Escpos:
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pix_line += im_right
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img_size[0] += im_border[1]
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self._print_image(pix_line, img_size)
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return pix_line, img_size
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def image(self,path_img):
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""" Open image file """
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""" Open and immediately print image file """
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im_open = Image.open(path_img)
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im = im_open.convert("RGB")
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# Convert the RGB image in printable image
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self._convert_image(im)
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# Convert the RGB image in printable image
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(pix_line, img_size) = self._convert_image(im)
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self._print_image(pix_line, img_size)
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def cached_image(self, index):
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""" Prints an image from the image cache """
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self._raw(S_RASTER_N)
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self._raw(self.img_cache[index])
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def qr(self,text):
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""" Print QR Code for the provided string """
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83
escpos/printer.py
Normal file → Executable file
83
escpos/printer.py
Normal file → Executable file
@ -18,6 +18,8 @@ from exceptions import *
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class Usb(Escpos):
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""" Define USB printer """
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is_open = False
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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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@ -36,9 +38,14 @@ class Usb(Escpos):
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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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if self.is_open:
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return # Already open; no need to reopen
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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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else:
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self.is_open = True
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if self.device.is_kernel_driver_active(0):
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try:
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@ -50,9 +57,21 @@ class Usb(Escpos):
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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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# Seems fatal when it occurs. Should the device be closed as a result?
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#self.close()
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print "Could not set configuration: %s" % str(e)
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def close(self):
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""" Manually release USB interface """
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self.is_open = False
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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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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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@ -60,15 +79,15 @@ class Usb(Escpos):
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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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self.close()
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class Serial(Escpos):
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""" Define Serial printer """
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is_open = False
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def __init__(self, devfile="/dev/ttyS0", baudrate=9600, bytesize=8, timeout=1):
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"""
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@param devfile : Device file under dev filesystem
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@ -84,15 +103,29 @@ class Serial(Escpos):
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def open(self):
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""" Setup serial port and set is as escpos device """
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""" Setup serial port and set it as escpos device """
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if self.is_open:
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return # Already open; no need to reopen
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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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self.is_open = True
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else:
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print "Unable to open serial printer on: %s" % self.devfile
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def close(self):
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""" Manually close Serial interface """
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self.is_open = False
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if self.device is not None:
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self.device.close()
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self.device = None
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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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@ -100,14 +133,14 @@ class Serial(Escpos):
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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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self.close()
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class Network(Escpos):
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""" Define Network printer """
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is_open = False
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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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@ -120,11 +153,26 @@ class Network(Escpos):
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def open(self):
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""" Open TCP socket and set it as escpos device """
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if self.is_open:
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return # Already open; no need to reopen
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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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else:
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self.is_open = True
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def close(self):
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""" Manually close TCP connection """
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self.is_open = False
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if self.device is not None:
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self.device.close()
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self.device = None
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def _raw(self, msg):
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@ -134,13 +182,15 @@ class Network(Escpos):
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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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self.close()
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class File(Escpos):
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""" Define Generic file printer """
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is_open = False
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def __init__(self, devfile="/dev/usb/lp0"):
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"""
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@param devfile : Device file under dev filesystem
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@ -151,10 +201,25 @@ class File(Escpos):
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def open(self):
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""" Open system file """
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if self.is_open:
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return # Already open; no need to reopen
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self.device = open(self.devfile, "wb")
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if self.device is None:
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print "Could not open the specified file %s" % self.devfile
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else:
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self.is_open = True
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def close(self):
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""" Manually close system file """
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self.is_open = False
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if self.device is not None:
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self.device.close()
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self.device = None
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def _raw(self, msg):
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@ -164,4 +229,4 @@ class File(Escpos):
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def __del__(self):
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""" Close system file """
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self.device.close()
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self.close()
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