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pyusb backend: assert seleted iface bInterfaceClass == 7 (a 'printer')

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Philipp Klaus committed 2018-08-14 23:04:23 +02:00
1 parent 78b5667ca4
commit d209040b92
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+2 -1
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brother_ql/backends/pyusb.py
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@@ -98,7 +98,8 @@ class BrotherQLBackendPyUSB(BrotherQLBackendGeneric):
self.dev.set_configuration() self.dev.set_configuration()
cfg = self.dev.get_active_configuration() cfg = self.dev.get_active_configuration()
intf = cfg[(0,0)] intf = cfg[(0,0)] # (bInterfaceNumber, bAlternateSetting)
assert intf.bInterfaceClass == 7 # 'Printer' not 'Vendor Specific' or the likes...
ep_match_in = lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_IN ep_match_in = lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_IN
ep_match_out = lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_OUT ep_match_out = lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_OUT