监视文件夹和打印 - 不使用 "endless" while 循环的替代方法？

Question

所以，我写这篇文章是为了监视文件夹中的新图片并打印找到的任何图片。它有效，但我假设有更多 robust/efficient 方法来解决这个问题，因为我希望它一次运行 5-6 小时。

我的主要问题是我不喜欢像这样使用 "open" while 循环....

有人会以不同的方式解决这个问题吗？如果可以，有没有人愿意解释一下？

import os
import glob
import win32com.client
import time
from pywinauto.findwindows    import find_window
from pywinauto.win32functions import SetForegroundWindow

printed = []
i = 10 

while i < 1000000000000000:

files = glob.glob("C://Users//pictures/*.jpg")
for filename in files:
    print filename
    try:
        if printed.index(str(filename)) >= 0:
            print printed.index(filename)
            print "Image found" 
    except ValueError:  
        printed.append(filename)  
        os.startfile(filename, "print")
        shell = win32com.client.Dispatch("WScript.Shell")
        time.sleep(2)
        SetForegroundWindow(find_window(title='Print Pictures'))   
        shell.AppActivate("Print Pictures")
        shell.SendKeys("{ENTER}")

i = i + 1
time.sleep(5)

Answer 1

link 下面是相关的post。您可以使用观察器来触发您的操作，而不是使用长时间循环。

How to detect new or modified files

Answer 2

非常感谢 scope 的评论，我已将我的打印行添加到示例中并且效果很好。下面为任何需要它的人发布代码，注释代码在发布的 link 代码中。现在整理其他一些东西....

import os

import win32file
import win32event
import win
import glob
import win32com.client
import time
from pywinauto.findwindows    import find_window
from pywinauto.win32functions import SetForegroundWindow




def print_photo(filename): 
    print filename
    filename = path_to_watch +"\" + filename[0]
    os.startfile(filename, "print")
    shell = win32com.client.Dispatch("WScript.Shell")
    time.sleep(2)
    SetForegroundWindow(find_window(title='Print Pictures'))   
    shell.AppActivate("Print Pictures")
    shell.SendKeys("{ENTER}")

path_to_watch = os.path.abspath ("C:\Users\Ciaran\Desktop\")


change_handle = win32file.FindFirstChangeNotification (
  path_to_watch,
  0,
  win32con.FILE_NOTIFY_CHANGE_FILE_NAME
)


try:

  old_path_contents = dict ([(f, None) for f in os.listdir     (path_to_watch)])
  while 1:
    result = win32event.WaitForSingleObject (change_handle, 500)


    if result == win32con.WAIT_OBJECT_0:
      new_path_contents = dict ([(f, None) for f in os.listdir     (path_to_watch)])
      added = [f for f in new_path_contents if not f in     old_path_contents]
      print_photo(added)
      deleted = [f for f in old_path_contents if not f in new_path_contents]
      if added: print "Added: ", ", ".join (added)
      if deleted: print "Deleted: ", ", ".join (deleted)

      old_path_contents = new_path_contents
      win32file.FindNextChangeNotification (change_handle)

finally:
  win32file.FindCloseChangeNotification (change_handle)

监视文件夹和打印 - 不使用 "endless" while 循环的替代方法？

Monitoring a folder and printing - alternative methods not using an "endless" while loop?

python

printing

monitoring

pywinauto