pause_trigger.py 文件源码

def dig_pattern_src(self):
        """
        :class:`nidaqmx.system.physical_channel.PhysicalChannel`:
            Specifies the physical channels to use for pattern matching.
            The order of the physical channels determines the order of
            the pattern. If a port is included, the lines within the
            port are in ascending order.
        """
        cfunc = lib_importer.windll.DAQmxGetDigPatternPauseTrigSrc
        if cfunc.argtypes is None:
            with cfunc.arglock:
                if cfunc.argtypes is None:
                    cfunc.argtypes = [
                        lib_importer.task_handle, ctypes.c_char_p,
                        ctypes.c_uint]

        temp_size = 0
        while True:
            val = ctypes.create_string_buffer(temp_size)

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

            if is_string_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 PhysicalChannel(val.value.decode('ascii'))