out_stream.py 文件源码

def do_num_booleans_per_chan(self):
        """
        int: Indicates the number of Boolean values expected per channel
            in a sample for line-based writes. This property is
            determined by the channel in the task with the most digital
            lines. If a channel has fewer lines than this number, NI-
            DAQmx ignores the extra Boolean values.
        """
        val = ctypes.c_uint()

        cfunc = lib_importer.windll.DAQmxGetWriteDigitalLinesBytesPerChan
        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