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comparison zebra.py @ 10:6a1963ee4aff

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Added docstrings Minor tidying up
author Ben Croston <ben@fuzzyduckbrewery.co.uk>
date Mon, 15 Aug 2011 01:00:49 +0100
parents 19fd067db7ca
children e6ea86e3d0e1
comparison
equal deleted inserted replaced
9:19a28a953f39 10:6a1963ee4aff
1 #!/usr/bin/env python 1 #!/usr/bin/env python
2 # NOTE: this package is Linux specific at the moment
3 2
4 import subprocess 3 import subprocess
5 import os.path 4 import os.path
6 import sys 5 import sys
6
7 if sys.platform.lower().startswith('win'): 7 if sys.platform.lower().startswith('win'):
8 IS_WINDOWS = True
8 import win32print 9 import win32print
10 else:
11 IS_WINDOWS = False
9 12
10 class zebra(object): 13 class zebra(object):
14 """A class to communicate with (Zebra) label printers using EPL2"""
15
11 def __init__(self, queue=None): 16 def __init__(self, queue=None):
12 """queue - name of the printer queue""" 17 """queue - name of the printer queue (optional)"""
13 self.queue = queue 18 self.queue = queue
14 19
15 def _output_unix(self, commands): 20 def _output_unix(self, commands):
16 if self.queue == 'zebra_python_unittest': 21 if self.queue == 'zebra_python_unittest':
17 p = subprocess.Popen(['cat','-'], stdin=subprocess.PIPE) 22 p = subprocess.Popen(['cat','-'], stdin=subprocess.PIPE)
40 win32print.EndDocPrinter(hPrinter) 45 win32print.EndDocPrinter(hPrinter)
41 finally: 46 finally:
42 win32print.ClosePrinter(hPrinter) 47 win32print.ClosePrinter(hPrinter)
43 48
44 def output(self, commands): 49 def output(self, commands):
50 """Output EPL2 commands to the label printer
51
52 commands - EPL2 commands to send to the printer
53 """
45 assert self.queue is not None 54 assert self.queue is not None
46 if sys.platform.lower().startswith('win'): 55 if IS_WINDOWS:
47 self._output_win(commands) 56 self._output_win(commands)
48 else: 57 else:
49 self._output_unix(commmands) 58 self._output_unix(commmands)
50 59
51 def _getqueues_unix(self): 60 def _getqueues_unix(self):
61 for (a,b,name,d) in win32print.EnumPrinters(win32print.PRINTER_ENUM_LOCAL): 70 for (a,b,name,d) in win32print.EnumPrinters(win32print.PRINTER_ENUM_LOCAL):
62 printers.append(name) 71 printers.append(name)
63 return printers 72 return printers
64 73
65 def getqueues(self): 74 def getqueues(self):
66 if sys.platform.lower().startswith('win'): 75 """Returns a list of printer queues on local machine"""
76 if IS_WINDOWS:
67 return self._getqueues_win() 77 return self._getqueues_win()
68 else: 78 else:
69 return self._getqueues_unix() 79 return self._getqueues_unix()
70 80
71 def setqueue(self, queue): 81 def setqueue(self, queue):
82 """Set the printer queue"""
72 self.queue = queue 83 self.queue = queue
73 84
74 def setup(self, direct_thermal=None, label_height=None, label_width=None): 85 def setup(self, direct_thermal=None, label_height=None, label_width=None):
86 """Set up the label printer. Parameters are not set if they are None.
87
88 direct_thermal - True if using direct thermal labels
89 label_height - tuple (label height, label gap) in dots
90 label_width - in dots
91 """
75 commands = '\n' 92 commands = '\n'
76 if direct_thermal: 93 if direct_thermal:
77 commands += ('OD\n') 94 commands += ('OD\n')
78 if label_height: 95 if label_height:
79 commands += ('Q%s,%s\n'%(label_height[0],label_height[1])) 96 commands += ('Q%s,%s\n'%(label_height[0],label_height[1]))
80 if label_width: 97 if label_width:
81 commands += ('q%s\n'%label_width) 98 commands += ('q%s\n'%label_width)
82 self.output(commands) 99 self.output(commands)
83 100
84 def store_graphic(self, name, filename): 101 def store_graphic(self, name, filename):
85 assert filename.endswith('.pcx') 102 """Store a .PCX file on the label printer
103
104 name - name to be used on printer
105 filename - local filename
106 """
107 assert filename.lower().endswith('.pcx')
86 commands = '\nGK"%s"\n'%name 108 commands = '\nGK"%s"\n'%name
87 commands += 'GK"%s"\n'%name 109 commands += 'GK"%s"\n'%name
88 size = os.path.getsize(filename) 110 size = os.path.getsize(filename)
89 commands += 'GM"%s"%s\n'%(name,size) 111 commands += 'GM"%s"%s\n'%(name,size)
90 self.output(commands) 112 self.output(commands)