Python 子进程调用应该按原样作为命令运行,但如果其中有管道,它就会抱怨。这是我的代码:
#!/usr/bin/python
import sys
import subprocess
import time
service_name= "mysrvc"
state ="STOPPED"
mycmd ="sc query " + service_name + " " + "|" + " findstr" + " " + state
print(mycmd)
if subprocess.call(mycmd)==0:
print("Service stopped successfully")
我得到的错误是:
ERROR: Invalid Option; Would you like to see help for the QUERY and QUERYEX commands? [ y | n ]:
如果我将命令更改为
mycmd = "sc query " + service_name
我能够成功运行该脚本。只是管道及其后面的参数是一个问题。如果我跑sc query mysvrc | findstr STOPPED
直接在命令行上工作正常。
我怎样才能让它发挥作用?请注意,我使用 jython2.7 运行此 python 脚本。我没有成功使用 win32serviceutil,因为它找不到模块 win32serviceutil。
正如已经说过的,subprocess无法处理单个str输入和 shell 元字符,例如| unless shell=True https://docs.python.org/3/library/subprocess.html#frequently-used-arguments。但在这种情况下,你确实不需要管道。您可以让 Python 进行过滤并避免使用管道findstr
完全地:
# sc query command only, as list which gets better safety/performance
mycmd = ["sc", "query", service_name]
# Open command to run asynchronously, capturing output
proc = subprocess.Popen(mycmd, stdout=subprocess.PIPE)
# Wait for process to complete while slurping output
stdout, _ = proc.communicate()
# Check if expected output was seen and process exited successfully
if state in stdout and proc.returncode == 0:
print("Service stopped successfully")
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