reference_trigger.py 文件源码

def pretrig_samples(self):
        """
        int: Specifies the minimum number of pretrigger samples to
            acquire from each channel before recognizing the reference
            trigger. Post-trigger samples per channel are equal to
            **samp_quant_samp_per_chan** minus the number of pretrigger
            samples per channel.
        """
        val = ctypes.c_uint()

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

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

        return val.value