在Windows 7上Pyusb - NotImplemented错误：is_kernal_driver_active

Question

我正在使用escposprinter python库打印我的数据在热敏打印机中。这取决于pyusb。该库在Linux中正常工作。而在Windows 7中，我得到它有一些问题。这里是我得到的输出。

File "main.py", line 1, in <module> 
    from app import app 
    File "D:\freeth-in-erp-60ab8eb96fad\app\__init__.py", line 94, in <module> 
    from .api_routes import * 
    File "D:\freeth-in-erp-60ab8eb96fad\app\api_routes.py", line 44, in <module> 
    from .printer import pos 
    File "D:\freeth-in-erp-60ab8eb96fad\app\printer\pos.py", line 14, in <module> 
    Epson = printer.Usb(idVendor=0x0416,idProduct=0x5011) 
    File "D:\freeth-in-erp-60ab8eb96fad\venv\lib\site-packages\escposprinter\print 
er.py", line 37, in __init__ 
    self.open() 
    File "D:\freeth-in-erp-60ab8eb96fad\venv\lib\site-packages\escposprinter\print 
er.py", line 46, in open 
    if self.device.is_kernel_driver_active(0): 
    File "D:\freeth-in-erp-60ab8eb96fad\venv\lib\site-packages\usb\core.py", line 
1064, in is_kernel_driver_active 
    interface) 
    File "D:\freeth-in-erp-60ab8eb96fad\venv\lib\site-packages\usb\backend\__init_ 
_.py", line 365, in is_kernel_driver_active 
    _not_implemented(self.is_kernel_driver_active) 
    File "D:\freeth-in-erp-60ab8eb96fad\venv\lib\site-packages\usb\backend\__init_ 
_.py", line 81, in _not_implemented 
    raise NotImplementedError(func.__name__) 
NotImplementedError: is_kernel_driver_active 

我下载的libusb-1.20从libusb.info和复制从MINGW32文件的libusb-1.0.dll和在 “C：\ Windows \ System32下” 粘贴。我得到以下结果。

from app import app 
    File "D:\freeth-in-erp-60ab8eb96fad\app\__init__.py", line 94, in <module> 
    from .api_routes import * 
    File "D:\freeth-in-erp-60ab8eb96fad\app\api_routes.py", line 44, in <module> 
    from .printer import pos 
    File "D:\freeth-in-erp-60ab8eb96fad\app\printer\pos.py", line 14, in <module> 
    Epson = printer.Usb(idVendor=0x0416,idProduct=0x5011) 
    File "D:\freeth-in-erp-60ab8eb96fad\venv\lib\site-packages\escposprinter\print 
er.py", line 37, in __init__ 
    self.open() 
    File "D:\freeth-in-erp-60ab8eb96fad\venv\lib\site-packages\escposprinter\print 
er.py", line 46, in open 
    if self.device.is_kernel_driver_active(0): 
    File "D:\freeth-in-erp-60ab8eb96fad\venv\lib\site-packages\usb\core.py", line 
1064, in is_kernel_driver_active 
    interface) 
    File "D:\freeth-in-erp-60ab8eb96fad\venv\lib\site-packages\usb\backend\libusb1 
.py", line 898, in is_kernel_driver_active 
    intf))) 
    File "D:\freeth-in-erp-60ab8eb96fad\venv\lib\site-packages\usb\backend\libusb1 
.py", line 593, in _check 
    raise NotImplementedError(_strerror(ret)) 
NotImplementedError: Operation not supported or unimplemented on this platform 

我的代码是 `

from escposprinter import * 
from tabulate import tabulate 

Epson = printer.Usb(0x0416,0x5011) 

从库escposprinter

class Usb(Escpos): 
    """ Define USB printer """ 

    def __init__(self, idVendor, idProduct, interface=0, in_ep=0x82, out_ep=0x01): 
     """ 
     @param idVendor : Vendor ID 
     @param idProduct : Product ID 
     @param interface : USB device interface 
     @param in_ep  : Input end point 
     @param out_ep : Output end point 
     """ 
     self.idVendor = idVendor 
     self.idProduct = idProduct 
     self.interface = interface 
     self.in_ep  = in_ep 
     self.out_ep = out_ep 
     self.open() 


    def open(self): 
     """ Search device on USB tree and set is as escpos device """ 
     self.device = usb.core.find(idVendor=self.idVendor, idProduct=self.idProduct) 
     if self.device is None: 
      print ("Cable isn't plugged in") 

     if self.device.is_kernel_driver_active(0): 
      try: 
       self.device.detach_kernel_driver(0) 
      except usb.core.USBError as e: 
       print ("Could not detatch kernel driver: %s" % str(e)) 

帮我同意你的建议 `

Answer 1

的问题是简单明了的是，检查是否内核驱动程序处于活动状态，这是不可能的视窗。看起来这个库不是为了在Windows上使用而编写的。

如果您从源代码中删除最后5行（从if self.device.is_kernel_driver_active(0):开始）或者检查代码是否事先在Windows上运行并且不调用它们，则可以在Windows上使用它。

在Windows上记住你需要安装你自己的驱动程序。我建议使用Zadig来创建和/或安装驱动程序。