Python Win32 服务
我对Python还比较陌生,也没有写Windows服务的经验。我试着根据网上找到的一些教程拼凑了一个Windows服务。
我需要这个服务不断监控一个文件夹的变化,当它发现有变化时就运行一个脚本。以下是我目前的代码:
import win32service
import win32serviceutil
import time
class aservice(win32serviceutil.ServiceFramework):
_svc_name_ = "aservice"
_svc_display_name_ = "aservice - It Does nothing"
def __init__(self,args):
win32serviceutil.ServiceFramework.__init__(self,args)
self.isAlive = True
def SvcDoRun(self):
import servicemanager
while self.isAlive:
# This is where i am trying to run my code...is that right?
self.main()
#servicemanager.LogInfoMsg("aservice - is alive and well")
#time.sleep(5)
#servicemanager.LogInfoMsg("aservice - Stopped")
def SvcStop(self):
import servicemanager
servicemanager.LogInfoMsg("aservice - Recieved stop signal")
self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
self.isAlive = False #this will make SvcDoRun() break the while loop at the next iteration.
# This code monitors a directory for changes and calls a script when there is a change
# At the moment, it creates a log file instead of calling the script
def main(self):
import os
import win32file
import win32con
ACTIONS = {
1: "Created",
2: "Deleted",
3: "Updated",
4: "Renamed from something",
5: "Ranamed to something"
}
FILE_LIST_DIRECTORY = 0x0001
path_to_watch = "folder"
hDir = win32file.CreateFile (
path_to_watch,
FILE_LIST_DIRECTORY,
win32con.FILE_SHARE_READ | win32con.FILE_SHARE_WRITE,
None,
win32con.OPEN_EXISTING,
win32con.FILE_FLAG_BACKUP_SEMANTICS,
None
)
while 1:
results = win32file.ReadDirectoryChangesW (
hDir,
1024,
True,
win32con.FILE_NOTIFY_CHANGE_FILE_NAME |
win32con.FILE_NOTIFY_CHANGE_DIR_NAME |
win32con.FILE_NOTIFY_CHANGE_ATTRIBUTES |
win32con.FILE_NOTIFY_CHANGE_SIZE |
win32con.FILE_NOTIFY_CHANGE_LAST_WRITE |
win32con.FILE_NOTIFY_CHANGE_SECURITY,
None,
None
)
for action, file in results:
#import script
log = open ('log.txt', 'w')
full_filename = os.path.join(path_to_watch)
log.write(full_filename + ACTIONS.get(action, "Unknown"))
log.close()
if __name__ == '__main__':
win32serviceutil.HandleCommandLine(aservice)
有没有人能告诉我我哪里做错了?
补充:这是我在事件日志中看到的错误信息。
Event Type: Error
Event Source: aservice
Event Category: None
Event ID: 3
Date: 21/01/2010
Time: 11:27:43 AM
User: N/A
Computer:
Description:
The instance's SvcRun() method failed
Traceback (most recent call last):
File "C:\Python25\Lib\site-packages\win32\lib\win32serviceutil.py", line 806, in SvcRun
self.SvcDoRun()
File "D:\TEST\simpleservice2.py", line 35, in SvcDoRun
self.main()
File "D:\TEST\simpleservice2.py", line 72, in main
None
error: (2, 'CreateFile', 'The system cannot find the file specified.')
%2: %3
2 个回答
2
在使用Windows服务时,有一点需要注意,那就是默认情况下,它们是以LOCAL_SYSTEM账户运行的。这意味着它们对本地磁盘的权限是有效的(也就是说,LOCAL_SYSTEM账户可能会被拒绝访问某个特定的文件夹),而且LOCAL_SYSTEM账户无法访问任何网络磁盘。
1
我对pywin32的ServiceFramework
不太熟悉,不过根据你的代码和错误信息,我猜你的问题可能出在path_to_watch
上。
我想你在举例的时候可能把文件夹的名字处理过了,实际上你并不是在找folder
。
那么,你可以考虑以下几点:
- 你是不是用了文件夹的完整路径?服务的当前工作目录可能和你想的不同。
- 你在文件夹路径中有没有处理反斜杠?
试试用:
path_to_watch = r"c:\foo\bar" + "\\"