Question

我一直在使用tkinter组合的看门狗模块来处理一些上传请求。在大多数情况下，它可以正常工作，但有时我们的网络驱动器会变得不稳定，并在一定时间内断开连接。但是我找不到正确的位置来捕获此错误。

from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
import tkinter as tk

root = tk.Tk()
path = [r"Network path 1",r"Network path 2"]

class MyGui:
    def __init__(self,master):
        self.master = master
        self.but = tk.Button(master,text="Click to start observer",command=self.start_observer)
        self.but.pack()

    def start_observer(self):
        for i in path:
            observer.schedule(event_handler, path=i, recursive=False)
        observer.start()
        self.but.config(state="disabled",text="observer started")
        print ("Observer started")

class MyHandler(FileSystemEventHandler):
    def on_created(self, event):
        current_file = event.src_path
        print (current_file)

event_handler = MyHandler()
observer = Observer()

gui = MyGui(root)
root.mainloop()

这是我让它运行几天后得到的：

Exception in thread Thread-4:
Traceback (most recent call last):
  File "C:\Users\AppData\Local\Programs\Python\Python37\lib\threading.py", line 917, in _bootstrap_inner
    self.run()
  File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\api.py", line 146, in run
    self.queue_events(self.timeout)
  File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\read_directory_changes.py", line 75, in queue_events
    winapi_events = read_events(self._handle, self.watch.is_recursive)
  File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\winapi.py", line 346, in read_events
    buf, nbytes = read_directory_changes(handle, recursive)
  File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\winapi.py", line 306, in read_directory_changes
    raise e
  File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\winapi.py", line 302, in read_directory_changes
    ctypes.byref(nbytes), None, None)
  File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\watchdog\observers\winapi.py", line 107, in _errcheck_bool
    raise ctypes.WinError()
OSError: [WinError 64] The specified network name is no longer available.

有人可以建议如何正确处理此异常吗？

Answer 1

这是我解决此问题的方法：

AsyncTask

对from watchdog import observers from watchdog.observers.api import DEFAULT_OBSERVER_TIMEOUT, BaseObserver class MyEmitter(observers.read_directory_changes.WindowsApiEmitter): def queue_events(self, timeout): try: super().queue_events(timeout) except OSError as e: print(e) connected = False while not connected: try: self.on_thread_start() # need to re-set the directory handle. connected = True print('reconnected') except OSError: print('attempting to reconnect...') time.sleep(10) observer = BaseObserver(emitter_class=MyEmitter, timeout=DEFAULT_OBSERVER_TIMEOUT) ...进行子类化以捕获WindowsApiEmitter中的异常。为了在重新连接后继续运行，看门狗需要重新设置目录句柄，我们可以使用queue_events进行设置。

然后将self.on_thread_start()与MyEmitter一起使用，我们现在可以处理丢失和恢复与共享驱动器的连接。

从看门狗处理OSError

1 个答案: