我正在创建一个python脚本,该脚本将识别对日志文件的更改并从新日志中打印一些数据。
我使用看门狗创建了一个事件处理程序,除此以外,其他一切似乎都正常运行,每次修改文件时都会得到重复的事件。我检查了创建和删除操作,它们都按预期工作并且触发了一次。
我读过类似的问题,该问题解释了保存文件时发生的创建事件和修改事件,但这不是我的情况。我刚得到两个修改事件。
这是我的代码:
import os, sys, time
import subprocess
import threading
import win32print
from tkinter import filedialog
from tkinter import *
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
class Handler(FileSystemEventHandler):
# docstring for FileSystemEventHandler
def __init__(self, observer, filename, dirname):
# super(Handler, FileSystemEventHandler).__init__(self,)
self.observer = observer
self.filename = filename
self.dirname = dirname
print("Handler filename = " , self.filename)
print("Handler dirname = " , self.dirname)
def on_modified(self, event):
if self.filename == event.src_path:
print("The file was modified")
print (event.src_path)
# go get the last line and print the data
# try:
# hJob = win32print.StartDocPrinter (hPrinter, 1, ("test of raw data", None, "RAW"))
# try:
# win32print.StartPagePrinter (hPrinter)
# win32print.WritePrinter (hPrinter, raw_data)
# win32print.EndPagePrinter (hPrinter)
# finally:
# win32print.EndDocPrinter (hPrinter)
# finally:
# win32print.ClosePrinter (hPrinter)
def on_created(self, event):
print("A file was created (", event.src_path, ")")
def on_deleted(self, event):
print("A file was deleted (", event.src_path, ")")
if __name__ == "__main__":
Flags=2
Name=None
Level=1
printers = win32print.EnumPrinters(Flags, Name, Level)
print("\nChoose a printer to use:")
i=1
for p in printers:
print(i,')' , p[2])
i = i+1
if sys.version_info >= (3,):
raw_data = bytes ("This is a test", "utf-8")
else:
raw_data = "This is a test"
printer = int(input())
printer_name = printers[printer-1][2] #win32print.GetDefaultPrinter ()
print("You chose ", printer_name, "\nI will now print from the specified file with this printer")
hPrinter = win32print.OpenPrinter (printer_name)
# root = Tk()
# root.filename = filedialog.askopenfilename(initialdir = "/Desktop",title = "Select file",filetypes = (("log files","*.log"),("all files","*.*")))
file_path = "some_file_path" # root.filename
file_directory = os.path.dirname(file_path)
# print (file_path)
print (file_directory)
observer = Observer()
event_handler = Handler(observer, file_path, file_directory)
observer.schedule(event_handler, path=file_directory, recursive=False)
observer.start()
observer.join()
任何想法都会感激
编辑:
经过一些调试后,我发现Windows10每次保存文件时都会两次更改文件修改时间。
概念证明代码是这样的:
prev_modification_time = os.path.getmtime(file_path)
while True:
current_mod_time = os.path.getmtime(file_path)
if prev_modification_time != current_mod_time :
print ("the file was modified, last modification time is: ", current_mod_time)
prev_modification_time = current_mod_time
pass
最终编辑:
在linux上测试我的代码(准确地说是Debian Stretch)之后,它就像一个魅力。因此,与先前的编辑结合起来,可能表明看门狗工作正常,而Windows10则存在一些问题。我应该在其他问题上还是在这里发布?