scanner.py

# Wrapper for LS2208 Barcode Scanner HID device, gently modified from Wiimode interface code
# --> http://code.google.com/p/pywiimote/
# MIT license

import HID
import sys
#from hid import AccessDeniedError, PathNotFoundError

# The scanner VID/PID change if neessary
VENDORID = 0x05e0
PRODUCTID = 0x1300

class Scanner(object):
    """ this library is platform-independent but depends on the backend HID.py"""
    def __init__(self, handle):
        """handle is an HIDDevice object """
        self.handle = handle
        #self.overlapped = overlapped

        
    def read(self):
        return self.handle.read(80)

    def getBarcode(self):
    
        readresult = self.read()
        #print readresult
        length = readresult[0]
        if (length == 0):
            return
        reportdata = readresult[1]
        reporttype = reportdata[0]
        #print "Number of bytes read: ", length
        #print "Buffer: "
        #for x in range(length):
        #    print(reportdata[x]),
        #print('\n')

        barcode = ""
        for x in range(5,length):
            if (reportdata[x] == 0):
                break
            barcode += chr(reportdata[x])
        return barcode
        
        #self.printStatus()
        

            

def get_scanners():
    """Returns a collection of barcode scanner objects."""
    targets = HID.OpenDevices(VENDORID,PRODUCTID)
    return [Scanner(scanner) for scanner in targets ]