subprocess module exec 'wmic datafile' command no result and how to fix it?

  • Z时代
  • 2024-02-08
  • 分类：IT

i can get reply in cmd.exe like this:

comand

wmic datafile where name="C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe" get Version /value

reply

Version=110.0.5481.178

but when i use python's subprocess,it will give me just empty reply

anyone has the same question?how to resolve it?

回答：

import subprocess
spath = r"C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe"
cargs = ["wmic", "datafile", "where", "name=\"{0}\"".format(spath), "get", "Version", "/value"]
process = subprocess.check_output(cargs)
print(process.strip().decode())

subprocess module exec 'wmic datafile' command no result and how to fix it?

回答：

If you want to get the result from subprocess module, you can try these functions as below.

1. subprocess.check_output
  • Run command with arguments and return its output.
  • Example:
In [70]: r = subprocess.check_output("ls ~", shell=True)
In [72]: r.decode()
Out[72]: 'Applications\nDesktop\nDocuments\nDownloads\nLibrary\nMovies\nMusic\nPictures\nPostman\nPublic\nSunlogin Files\nfineagent.jar\nget-poetry.py\ngo\nlogfile\npip.conf\npythonlogs\nrequirements.txt\nssh.sh\n'
2. subprocess.getoutput
  • Return output (stdout and stderr) of executing cmd in a shell.
  • Example:
In [79]: r = subprocess.getoutput("ls ~")
In [80]: r
Out[80]: 'Applications\nDesktop\nDocuments\nDownloads\nLibrary\nMovies\nMusic\nPictures\nPostman\nPublic\nSunlogin Files\nfineagent.jar\nget-poetry.py\ngo\nlogfile\npip.conf\npythonlogs\nrequirements.txt\nssh.sh'

and also subprocess.getstatusoutput, etc.

You have more choice. Refer official website: portal1 | portal2

But the functions metioned above are either legacy functions from the 2.x commands module or old high level api...

Now the recommended way to invoke subprocess is to use run() function. For more advanced use cases, the underlying Popen 「It's also a nice choice.」interface can be used directly.

3. subprocess.run
  • Run the command described by args. Wait for command to complete, then return a CompletedProcess instance.
  • Example:
In [76]: r = subprocess.run("ls ~", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
In [77]: r
Out[77]: CompletedProcess(args='ls ~', returncode=0, stdout=b'Applications\nDesktop\nDocuments\nDownloads\nLibrary\nMovies\nMusic\nPictures\nPostman\nPublic\nSunlogin Files\nfineagent.jar\nget-poetry.py\ngo\nlogfile\npip.conf\npythonlogs\nrequirements.txt\nssh.sh\n', stderr=b'')
In [78]: r.stdout
Out[79]: b'Applications\nDesktop\nDocuments\nDownloads\nLibrary\nMovies\nMusic\nPictures\nPostman\nPublic\nSunlogin Files\nfineagent.jar\nget-poetry.py\ngo\nlogfile\npip.conf\npythonlogs\nrequirements.txt\nssh.sh\n'

Refer to the detailed description: subprocess.run

Hope it helps you.

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