OSError:XXX.so undefined symbol: libusb_open

XXX.so的源码为C语言，编译时依赖libusb1.0.so。

在python脚本 test.py打开该库时报错。

import ctypes

libc = ctypes.CDLL('XXX.so')

Traceback (most recent call last):
  File "test.py", line 80, in <module>
    ReadData()
  File "test.py", line 20, in ReadData
    libc = ctypes.CDLL('XXX.so')
  File "/usr/lib/python3.6/ctypes/__init__.py", line 348, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: XXX.so: undefined symbol: libusb_open

解决办法：

在libc = ctypes.CDLL('XXX.so')之前，加入：ctypes.CDLL('libusb-1.0.so',ctypes.RTLD_GLOBAL)

import ctypes

ctypes.CDLL('libusb-1.0.so',ctypes.RTLD_GLOBAL)
libc = ctypes.CDLL('XXX.so')