class para comunicação com impressoras térmicas protocolo PPLA

gistfile1.py

DEVICE = "/dev/lp0";
STX = chr(2);
CR  = chr(13);
LF  = chr(10);

DEFAULTS = {
	'ori':     4,
	'font':    2,
	'mh':      2,
	'mv':      2,
	'fontsub': 0,
	'y':       0,
	'x':       0,
}


class Label(object):
	def __init__(self, test=False):
		self.lines  = [];
		self.test   = test;
		if not self.test:
			self.device = open(DEVICE,"w");
		self.send_raw(STX+"L");
		self.send_raw("D11");
		self.send_raw("PE");
		self.send_raw("H11");

	def send_raw(self, data):
		if not self.test:
			self.device.write(data+CR);
			self.device.flush();
		sys.stdout.write("[IMPRESSORA] "+ data+CR+LF);
		sys.stdout.flush();

	def code(self, id, y, x, size = 22, height = 35, ori = 4):
		command = '%dC%02d%03d%04d%04d' % (ori, size, height, y, x);
		self.send_raw(command+str(id));

	def text(self, text, y, x, **args):
		# para o remove_accents, eu estou usando https://gist.github.com/1141017 
		text = remove_accents(text).upper();
		parms = DEFAULTS.copy();
		parms.update(args);
		parms['y'] = y;
		parms['x'] = x;
		parms['font'] = allowed_font(parms['font'],len(text));
		command = "%(ori)1d%(font)1s%(mh)1d%(mv)1d%(fontsub)03d%(y)04d%(x)04d" % parms;
		self.send_raw(command+text[0:40]);

	def close(self, copies = 1):
		self.send_raw("Q%04d" % (int(copies),) );
		self.send_raw("E");
		if not self.test:
			self.device.close();