wmi.py 文件源码

def __call__ (self, timeout_ms=-1):
    """When called, return the instance which caused the event. Supports
     timeout in milliseconds (defaulting to infinite). If the watcher
     times out, :exc:`x_wmi_timed_out` is raised. This makes it easy to support
     watching for multiple objects.
    """
    try:
      event = self.wmi_event.NextEvent (timeout_ms)
      if self.is_extrinsic:
        return _wmi_event (event, None, self.fields)
      else:
        return _wmi_event (
          event.Properties_ ("TargetInstance").Value,
          _wmi_object (event, property_map=self._event_property_map),
          self.fields
        )
    except pywintypes.com_error:
      handle_com_error ()