export_signals.py 文件源码

def hshk_event_pulse_polarity(self):
        """
        :class:`nidaqmx.constants.Polarity`: Specifies the polarity of
            the exported Handshake Event if
            **hshk_event_output_behavior** is **ExportActions5.PULSE**.
        """
        val = ctypes.c_int()

        cfunc = lib_importer.windll.DAQmxGetExportedHshkEventPulsePolarity
        if cfunc.argtypes is None:
            with cfunc.arglock:
                if cfunc.argtypes is None:
                    cfunc.argtypes = [
                        lib_importer.task_handle, ctypes.POINTER(ctypes.c_int)]

        error_code = cfunc(
            self._handle, ctypes.byref(val))
        check_for_error(error_code)

        return Polarity(val.value)