def __init__(self, handle, iso_packets=0):
"""
You should not instanciate this class directly.
Call "getTransfer" method on an USBDeviceHandle instance to get
instances of this class.
"""
if iso_packets < 0:
raise ValueError('Cannot request a negative number of iso '
'packets.')
self.__handle = handle
self.__num_iso_packets = iso_packets
result = libusb1.libusb_alloc_transfer(iso_packets)
if not result:
raise libusb1.USBError('Unable to get a transfer object')
self.__transfer = result
self.__ctypesCallbackWrapper = libusb1.libusb_transfer_cb_fn_p(
self.__callbackWrapper)
def fillControlTransfer(self, transfer, setup, callback,
user_data, timeout):
libusb1.libusb_fill_control_transfer(transfer, self.handle,
setup, libusb1.libusb_transfer_cb_fn_p(callback), user_data,
timeout)
def fillInterruptTransfer(self, transfer, endpoint, string_buffer,
callback, user_data, timeout):
libusb1.libusb_fill_interrupt_transfer(transfer, self.handle,
endpoint, string_buffer, sizeof(string_buffer),
libusb1.libusb_transfer_cb_fn_p(callback), user_data,
timeout)