device.py 文件源码

def ai_resistance_rngs(self):
        """
        List[float]: Indicates pairs of input resistance ranges, in
            ohms, supported by devices that have the necessary signal
            conditioning to measure resistances. Each pair consists of
            the low value followed by the high value.
        """
        cfunc = lib_importer.windll.DAQmxGetDevAIResistanceRngs
        if cfunc.argtypes is None:
            with cfunc.arglock:
                if cfunc.argtypes is None:
                    cfunc.argtypes = [
                        ctypes_byte_str,
                        wrapped_ndpointer(dtype=numpy.float64,
                        flags=('C','W')), ctypes.c_uint]

        temp_size = 0
        while True:
            val = numpy.zeros(temp_size, dtype=numpy.float64)

            size_or_code = cfunc(
                self._name, val, temp_size)

            if is_array_buffer_too_small(size_or_code):
                # Buffer size must have changed between calls; check again.
                temp_size = 0
            elif size_or_code > 0 and temp_size == 0:
                # Buffer size obtained, use to retrieve data.
                temp_size = size_or_code
            else:
                break

        check_for_error(size_or_code)

        return val.tolist()