read_functions.py 文件源码

def _read_ctr_ticks(
        task_handle, high_tick, low_tick, num_samps_per_chan, timeout,
        interleaved=FillMode.GROUP_BY_CHANNEL):
    samps_per_chan_read = ctypes.c_int()

    cfunc = lib_importer.windll.DAQmxReadCtrTicks
    if cfunc.argtypes is None:
        with cfunc.arglock:
            if cfunc.argtypes is None:
                cfunc.argtypes = [
                    lib_importer.task_handle, ctypes.c_int, ctypes.c_double,
                    ctypes.c_int,
                    wrapped_ndpointer(dtype=numpy.uint32, flags=('C', 'W')),
                    wrapped_ndpointer(dtype=numpy.uint32, flags=('C', 'W')),
                    ctypes.c_uint, ctypes.POINTER(ctypes.c_int),
                    ctypes.POINTER(c_bool32)]

    error_code = cfunc(
        task_handle, num_samps_per_chan, timeout, interleaved.value,
        high_tick, low_tick, numpy.prod(high_tick.shape),
        ctypes.byref(samps_per_chan_read), None)
    check_for_error(error_code)

    return samps_per_chan_read.value