Question

下面是一个有效的python脚本，该脚本通过命令行接受目录路径并监视该目录，吐出出现在目录中的任何新图像文件的名称。我想通过命令行添加第二个参数，该参数最终将馈入该函数，只要新图像文件出现在该目录中，该函数就会被调用。

from watchdog.events import PatternMatchingEventHandler


class MyHandler(PatternMatchingEventHandler):
    patterns = ["*.jpg", "*.png", "*.tif"]

    # we only care about newly created images
    def on_created(self, event):
        print(event.src_path + "want to have arg2 available here") 


from watchdog.observers.polling import PollingObserver as Observer

if __name__ == '__main__':
    args = sys.argv[1:]
    observer = Observer()
    observer.schedule(MyHandler(), path=args[0] if args else '/images')
    observer.start()

    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()

    observer.join()

这样，当我调用文件时，它可能是这样的： python myfile.py /path/to/images arg2 和arg2将在on_created（self，event）中可用。抱歉，这么新上课！

Answer 1

您需要将额外的参数存储在MyHandler的实例中，以便在调用on_event方法时可以访问它们。像

class MyHandler(PatternMatchingEventHandler):
    patterns = ["*.jpg", "*.png", "*.tif"]

    def __init__(self, *args):
        super().__init__()
        self.extra_args = args

    def on_created(self, event):
        print(event.src_path + extra_args[0])

 from watchdog.observers.polling import PollingObserver as Observer

if __name__ == '__main__':
    args = sys.argv[1:]    
    observer = Observer()
    observer.schedule(MyHandler(*args[1:]), path=args[0] if args else '/images')
    observer.start()

    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()

    observer.join()

看门狗功能的命令行参数

1 个答案: