无法在子进程中写入标准输入 [英] Unable to write to stdin in subprocess

问题描述

我无法在 python 3.2.5 中将命令传递给 stdin.我尝试了以下两种方法另外:这个问题是上一个问题的延续.

i am unable to pass in commands to stdin in python 3.2.5. I have tried with the following 2 approaches Also: This question is a continuation of a previous question.

from subprocess import Popen, PIPE, STDOUT
import time

p = Popen([r'fileLoc/uploader.exe'],shell = True, stdout=PIPE, stdin=PIPE, stderr=STDOUT)
p.stdin.write('uploader -i file.txt -d outputFolder\n')
print (p.communicate()[0])
p.stdin.close()

当我在 IDLE 解释器中尝试代码时，我也得到了返回给我的数字，例如 96、0、85，以及诸如来自 print (p.communicate()[0]) 的错误代码>

i also get numbers such as 96, 0, 85 returned to me when i try the code in the IDLE interpreter, along with errors such as from the print (p.communicate()[0])

Traceback (most recent call last):
  File "<pyshell#132>", line 1, in <module>
    p.communicate()[0]
  File "C:\Python32\lib\subprocess.py", line 832, in communicate
    return self._communicate(input)
  File "C:\Python32\lib\subprocess.py", line 1060, in _communicate
    self.stdin.close()
IOError: [Errno 22] Invalid argument

我也用过:

from subprocess import Popen, PIPE, STDOUT
    import time

    p = Popen([r'fileLoc/uploader.exe'],shell = True, stdout=PIPE, stdin=PIPE, stderr=STDOUT)
    p.communicate(input= bytes(r'uploader -i file.txt -d outputFolder\n','UTF-8'))[0]
    print (p.communicate()[0])
    p.stdin.close()

但没有运气.

推荐答案

1. 将命令参数作为参数传递，而不是作为标准输入
2. 该命令可能会直接从控制台读取用户名/密码，而无需使用子进程的标准输入.在这种情况下，您可能需要 winpexpect 或 SendKeys 模块.请参阅我对具有相应代码示例的类似问题的回答

1. Pass command arguments as arguments, not as stdin
2. The command might read username/password from console directly without using subprocess' stdin. In this case you might need winpexpect or SendKeys modules. See my answer to a similar quesiton that has corresponding code examples

以下是如何使用参数启动子进程、传递一些输入以及将合并的子进程的 stdout/stderr 写入文件的示例:

Here's an example how to start a subprocess with arguments, pass some input, and write merged subprocess' stdout/stderr to a file:

#!/usr/bin/env python3
import os
from subprocess import Popen, PIPE, STDOUT

command = r'fileLoc\uploader.exe -i file.txt -d outputFolder'# use str on Windows
input_bytes = os.linesep.join(["[e-mail]", "password"]).encode("ascii")
with open('command_output.txt', 'wb') as outfile:
    with Popen(command, stdin=PIPE, stdout=outfile, stderr=STDOUT) as p:
        p.communicate(input_bytes)

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