Loads a library. Catches and logs exceptions.

    Returns: the loaded library or None

    arguments:
    * lib        -- path to/name of the library to be loaded
    * name       -- the library's identifier (for logging)
                    Defaults to None.
    * lib_cls    -- library class. Defaults to None (-> ctypes.CDLL).

def load_library(lib, name=None, lib_cls=None):
    """Loads a library. Catches and logs exceptions.

    Returns: the loaded library or None

    arguments:
    * lib        -- path to/name of the library to be loaded
    * name       -- the library's identifier (for logging)
                    Defaults to None.
    * lib_cls    -- library class. Defaults to None (-> ctypes.CDLL).
    """
    try:
        if lib_cls:
            return lib_cls(lib)
        else:
            return ctypes.CDLL(lib)
    except Exception:
        if name:
            lib_msg = '%s (%s)' % (name, lib)
        else:
            lib_msg = lib

        lib_msg += ' could not be loaded'

        if sys.platform == 'cygwin':
            lib_msg += ' in cygwin'
        _LOGGER.error(lib_msg, exc_info=True)
        return None