_dbr.py 文件源码

def native_to_builtin(value, native_type, data_count):
    '''Convert from a native EPICS DBR type to a builtin Python type

    Notes:
     - A waveform of characters is just a bytestring.
     - A waveform of strings is an array whose elements are fixed-length (40-
       character) strings.
     - Enums are just integers that happen to have special significance.
     - Everything else is, straightforwardly, an array of numbers.
    '''

    if USE_NUMPY:
        # Return an ndarray
        dt = _numpy_map[native_type]
        if native_type == ChannelType.STRING and len(value) < MAX_STRING_SIZE:
            # caput behaves this way
            return numpy.frombuffer(
                bytes(value).ljust(MAX_STRING_SIZE, b'\x00'), dtype=dt)

        return numpy.frombuffer(value, dtype=dt)
    else:
        # TODO
        raise NotImplementedError("the non-numpy version has not been "
                                  "written yet")