pyUSB的問題

Question

我一直在試圖用Python發送命令給DYMO labelmanager PnP USB設備發送命令。我嘗試安裝pyUSB並嘗試使用pyUSB教程中提供的代碼來弄清楚USB通信是如何工作的，但它不起作用。從pyUSB教程代碼：

（我已經改變了idVendor和idProduct應付我的設備它發現設備，但寫入失敗。）

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') 

，並給出了一個錯誤：

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) 

問題在哪裏？

（也當然有讀取功能需要兩個參數，僅1中給出，但我已經嘗試過調查，我不知道其他人需要理由是什麼）

Answer 1

的get_interface()定義如如下：

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. 
    """ 

所以，儘量使用usb.control.get_interface(dev, interface_number)