使用 CANoe 的 Python 中测量对象没有属性“OnInit”

Question

我想使用 COM 从 Python 脚本运行 CAPL 函数来将帧发送到网络，正如我阅读第 2.7 章中的 文档 一样，需要有一个 OnInit 事件，所以我修改了 py_canoe 并实现了：

import sys
import logging
import pythoncom
import win32com.client
from time import sleep as wait
from logging import handlers

function2 = None

def DoEvents():
    pythoncom.PumpWaitingMessages()
    wait(.1)

def DoEventsUntil(cond):
    while not cond():
        DoEvents()

class CanoeApplicationEvents:
    """Handler for CANoe Application events"""

    @staticmethod
    def OnOpen():
        print('canoe opened')
        CANoe.CANOE_APP_OPENED = True
        CANoe.CANOE_APP_CLOSED = False

    @staticmethod
    def OnQuit():
        print('canoe closed')
        CANoe.CANOE_APP_OPENED = False
        CANoe.CANOE_APP_CLOSED = True

class CanoeMeasurementEvents:
    """Handler for CANoe Measurement events"""

    @staticmethod
    def OnStart():
        CANoe.CANOE_MEAS_STARTED = True
        CANoe.CANOE_MEAS_STOPPED = False

    @staticmethod
    def OnStop():
        CANoe.CANOE_MEAS_STARTED = False
        CANoe.CANOE_MEAS_STOPPED = True

    @staticmethod
    def OnInit():
        global function2
        function2 = CANoe.CAPLFunction(CANoe.__canoe_objects['CAPL'].GetFunction('function'))

class CANoe:
    CANOE_APP_OPENED = False
    CANOE_APP_CLOSED = False
    CANOE_MEAS_STARTED = False
    CANOE_MEAS_STOPPED = False

    def __init__(self, py_canoe_log_dir=''):
        self.log = logging.getLogger('CANOE_LOG')
        self.__py_canoe_log_initialisation(py_canoe_log_dir)
        self.wait_for_canoe_app_to_open = None
        self.wait_for_canoe_meas_to_start = None
        self.wait_for_canoe_meas_to_stop = None
        self.wait_for_canoe_app_to_close = None
        self.__diag_ecu_qualifiers_dictionary = dict()
        self.__replay_blocks_obj_dictionary = dict()
        self.__canoe_objects = dict()
        self.__canoe_info = dict()

    def open(self, canoe_cfg: str, visible=True, auto_save=False, prompt_user=False) -> None:
        pythoncom.CoInitialize()
        self.__canoe_objects['Application'] = win32com.client.Dispatch('CANoe.Application')
        cav = self.__canoe_objects['Application'].Version
        self.log.info(f'Dispatched Vector CANoe Application {cav.major}.{cav.minor}.{cav.Build}')
        self.__canoe_objects['Application'].Visible = visible
        self.__canoe_objects['Application'].Configuration.Modified = False
        if os.path.isfile(canoe_cfg):
            self.log.info(f'CANoe cfg "{canoe_cfg}" found.')
            self.__canoe_objects['Application'].Open(canoe_cfg, auto_save, prompt_user)
            self.log.info(f'loaded CANoe config "{canoe_cfg}"')
            self.__canoe_objects['Bus'] = win32com.client.Dispatch(self.__canoe_objects['Application'].Bus)
            self.__canoe_objects['Configuration'] = win32com.client.Dispatch(self.__canoe_objects['Application'].Configuration)
            self.__canoe_objects['Measurement'] = win32com.client.Dispatch(self.__canoe_objects['Application'].Measurement)
            self.__canoe_objects['CAPL'] = win32com.client.Dispatch(self.__canoe_objects['Application'].CAPL)

            self.__canoe_objects['Measurement'].OnInit += self._IMeasurementEvents_OnInitEventHandler(
                self.OnInit)

    def __py_canoe_log_initialisation(self, py_canoe_log_dir):
        self.log.setLevel(logging.DEBUG)
        log_format = logging.Formatter("%(asctime)s [CANOE_LOG] [%(levelname)-5.5s]  %(message)s")
        ch = logging.StreamHandler(sys.stdout)
        ch.setFormatter(log_format)
        self.log.addHandler(ch)
        if py_canoe_log_dir != '' and not os.path.exists(py_canoe_log_dir):
            os.makedirs(py_canoe_log_dir, exist_ok=True)
        if os.path.exists(py_canoe_log_dir):
            fh = handlers.RotatingFileHandler(fr'{py_canoe_log_dir}\py_canoe.log', maxBytes=(1024 * 50), backupCount=20)
            fh.setFormatter(log_format)
            self.log.addHandler(fh)

    def OnInit(self):
        self.function = CANoe.CAPLFunction(self.__canoe_objects['CAPL'].GetFunction('function'))

    def callFunction(self):
        self.function.Call()

if __name__ == '__main__':
    canoe_inst = CANoe()
    canoe_inst.open(r'file.cfg')

运行后。我收到错误了

AttributeError: '<win32com.gen_py.CANoe 17.2 Type Library.IMeasurement5 instance at 0x1885133501008>' object has no attribute 'OnInit'

我不明白问题出在哪里，因为在官方 COM 文档中我实现了 OnInit 方法，但仍然找不到该属性

Answer 1

支持调用CAPL函数的包

https://chaitu-ycr.github.io/py_canoe/999_reference/#src.py_canoe.CANoe.call_capl_function