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我一直在尝试使用 Python 制作一个程序,该程序将命令发送到 DYMO labelmanager PnP usb 设备。我尝试安装 pyUSB 并尝试了 pyUSB 教程中提供的代码,以了解 USB 通信的工作原理,但它不起作用。pyUSB教程中的代码:

(我已更改 idVendor 和 idProduct 以应对我的设备。它找到了设备但写入失败)

import usb.core
import usb.util

# find our device
dev = usb.core.find(idVendor=0x0922, idProduct=0x1001)

# was it found?
if dev is None:
    raise ValueError('Device not found')

# set the active configuration. With no arguments, the first
# configuration will be the active one
dev.set_configuration()

# get an endpoint instance
cfg = dev.get_active_configuration()
interface_number = cfg[(0,0)].bInterfaceNumber
alternate_setting = usb.control.get_interface(interface_number)
intf = usb.util.find_descriptor(
    cfg, bInterfaceNumber = interface_number,
    bAlternateSetting = alternate_setting
)

ep = usb.util.find_descriptor(
    intf,
    # match the first OUT endpoint
    custom_match = \
    lambda e: \
        usb.util.endpoint_direction(e.bEndpointAddress) == \
        usb.util.ENDPOINT_OUT
)

assert ep is not None

# write the data
ep.write('test')

它给出了一个错误:

Traceback (most recent call last):
  File "C:\Python27\proc\labelprinttest.py", line 18, in <module>
    alternate_setting = usb.control.get_interface(interface_number)
TypeError: get_interface() takes exactly 2 arguments (1 given)

问题出在哪里?

(当然,读到该函数需要 2 个参数,并且只给出了 1 个,但我试图调查,但我不知道另一个需要的参数是什么)

4

1 回答 1

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的定义get_interface()如下:

def get_interface(dev, bInterfaceNumber):
    r"""Get the current alternate setting of the interface.

    dev is the Device object to which the request will be
    sent to.
    """

因此,尝试使用usb.control.get_interface(dev, interface_number)

于 2013-06-19T09:51:24.930 回答