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Merge pull request #61 from HarkonenBade/support-for-libusb0 

Prevent crash when using libusb0 printers
This commit is contained in:
manpaz 2015-10-07 23:19:46 -07:00
parent 5eaa6f26d0 cd5969e843
commit ef84a5150f
1 changed files with 10 additions and 2 deletions
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12
escpos/printer.py
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@ -40,11 +40,19 @@ class Usb(Escpos):
if self.device is None: if self.device is None:
print "Cable isn't plugged in" print "Cable isn't plugged in"
if self.device.is_kernel_driver_active(0): check_driver = None
try:
check_driver = self.device.is_kernel_driver_active(0)
except NotImplementedError:
pass
if check_driver is None or check_driver:
try: try:
self.device.detach_kernel_driver(0) self.device.detach_kernel_driver(0)
except usb.core.USBError as e: except usb.core.USBError as e:
print "Could not detatch kernel driver: %s" % str(e) if check_driver is not None:
print "Could not detatch kernel driver: %s" % str(e)
try: try:
self.device.set_configuration() self.device.set_configuration()