def __init__(self, default_timeout=5, device_prefix=None, default_wait_time=1.0): """ Initializes this ChannelAccess object. Args: device_prefix: The device prefix which will be added to the start of all pvs. default_timeout: The default time out to wait for an assertion on a PV to become true. default_wait_time: The default time to wait after a set_pv_value Returns: None. """ self.ca = CaChannelWrapper() self.default_wait_time = default_wait_time # Silence CA errors CaChannelWrapper.errorLogFunc = lambda *a, **kw: None try: hcom = ctypes.cdll.LoadLibrary("COM.DLL") hcom.eltc(ctypes.c_int(0)) except Exception as e: print("Unable to disable CA errors: ", e) self.prefix = os.environ["testing_prefix"] self._default_timeout = default_timeout if not self.prefix.endswith(':'): self.prefix += ':' if device_prefix is not None: self.prefix += "{}:".format(device_prefix)