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我試圖用pyusb和pyusb-keyboard-a-like來接管條形碼掃描器。 我有一個運行win7的系統。我已經安裝了帶有libusb-win32
過濾器和inf嚮導的usb驅動程序。 我的代碼看起來是這樣的:pyusb ValueError:沒有後端可用條形碼掃描器
from keyboard_alike import reader
class BarCodeReader(reader.Reader):
pass
if __name__ == "__main__":
reader = BarCodeReader(0x0c2e, 0x0b41, 84, 6, should_reset=False)
reader.initialize()
print(reader.read().strip())
reader.disconnect()
,並給了我以下錯誤:
Traceback (most recent call last):
File "C:\Users\Alexander\Downloads\pyusb-keyboard-alike-master\pyusb-keyboard-alike-master\lindy_bar_code_scanner.py", line 14, in <module>
reader.initialize()
File "C:\Users\Alexander\Downloads\pyusb-keyboard-alike-master\pyusb-keyboard-alike-master\keyboard_alike\reader.py", line 37, in initialize
self._device = usb.core.find(idVendor=self.vendor_id, idProduct=self.product_id)
File "C:\Python27\lib\site-packages\usb\core.py", line 846, in find
raise ValueError('No backend available')
ValueError: No backend available
我怎樣才能解決這個問題?