如何使用子进程和Popen从.exe中获取所有输出? [英] How do I get all of the output from my .exe using subprocess and Popen?

问题描述

我试图运行一个可执行文件并使用subprocess.Popen捕获其输出；但是，我似乎并没有获得全部输出.

I am trying to run an executable and capture its output using subprocess.Popen; however, I don't seem to be getting all of the output.

import subprocess as s
from subprocess import Popen 
import os

ps = Popen(r'C:\Tools\Dvb_pid_3_0.exe', stdin = s.PIPE,stdout = s.PIPE)
print 'pOpen done..'

while:

line = ps.stdout.readline()
print line

手动打开时，它比原始exe文件少打印两行.

It prints two line less than the original exe file when opened manually.

我尝试了一种具有相同结果的替代方法:

I tried an alternative approach with the same result:

f = open('myprogram_output.txt','w')
proc = Popen('C:\Tools\Dvb_pid_3_0.exe ', stdout =f)

line = proc.stdout.readline()
print line
f.close()

任何人都可以帮助我获取exe的完整数据吗?

Can anyone please help me to get the full data of the exe?

原始exe文件最后几行o/p:

Original exe file last few lines o/p:

-Gdd:通用计数(1-1000)

-Gdd : Generic count (1 - 1000)

-Cdd:切割开始于(0-99) -Edd:切割结束于(1-100)

-Cdd : Cut start at (0 - 99) -Edd : Cut end at (1 - 100)

请在下面选择流文件编号:

Please select the stream file number below:

1-.\ pdsx100-bcm7230-squashfs-sdk0.0.0.38-0.2.6.0-prod.sao.ts

1 - .\pdsx100-bcm7230-squashfs-sdk0.0.0.38-0.2.6.0-prod.sao.ts

跑步后得到的o/p:

-P0xYYYY      : Pid been interested                                          

-S0xYYYY:对服务ID感兴趣
-T0xYYYY:传输ID感兴趣
-N0xYYYY:对网络ID感兴趣
-R0xYYYY:一个旧的Pid已被此PID替换
-Gdd:通用计数(1-1000)

-S0xYYYY : Service ID been interested
-T0xYYYY : Transport ID been interested
-N0xYYYY : Network ID been interested
-R0xYYYY : A old Pid been replaced by this PID
-Gdd : Generic count (1 - 1000)

所以我们可以看到缺少的几行.我必须写1并选择值，请选择下面的文件编号.

So we can see some lines missing. I have to write 1 and choose value after please select the fule number below appears.

我尝试使用ps.stdin.write('1 \ n').它没有在exe文件中打印该值

I tried to use ps.stdin.write('1\n'). It didn't print the value in the exe file

新代码:

#!/usr/bin/env python
from subprocess import Popen, PIPE

cmd = r'C:\Tools\Dvb_pid_3_0.exe'
p = Popen(cmd, stdin=PIPE, stdout=None, stderr=None, universal_newlines=True)
stdout_text, stderr_text = p.communicate(input="1\n\n")

print("stdout: %r\nstderr: %r" % (stdout_text, stderr_text))
if p.returncode != 0:
    raise RuntimeError("%r failed, status code %d" % (cmd, p.returncode))

感谢塞巴斯蒂安.我能够看到整个输出，但无法用当前代码输入任何输入.

Thanks Sebastien. I am able to see the entire output but not able to feed in any input with the current code.

推荐答案

以字符串形式获取所有标准输出:

To get all stdout as a string:

from subprocess import check_output as qx

cmd = r'C:\Tools\Dvb_pid_3_0.exe'
output = qx(cmd)

要将stdout和stderr都作为单个字符串获取:

To get both stdout and stderr as a single string:

from subprocess import STDOUT

output = qx(cmd, stderr=STDOUT)

要获得所有行的列表:

lines = output.splitlines()

要获得子进程正在打印的行，请执行以下操作:

To get lines as they are being printed by the subprocess:

from subprocess import Popen, PIPE

p = Popen(cmd, stdout=PIPE, bufsize=1)
for line in iter(p.stdout.readline, ''):
    print line,
p.stdout.close()
if p.wait() != 0:
   raise RuntimeError("%r failed, exit status: %d" % (cmd, p.returncode))

在Popen()调用中添加stderr=STDOUT以合并stdout/stderr.

Add stderr=STDOUT to the Popen() call to merge stdout/stderr.

注意:如果cmd在非交互模式下使用块缓冲，则直到缓冲区刷新后才会出现行. winpexpect 模块可能能够更快地获取输出.

Note: if cmd uses block-buffering in the non-interactive mode then lines won't appear until the buffer flushes. winpexpect module might be able to get the output sooner.

要将输出保存到文件中:

To save the output to a file:

import subprocess

with open('output.txt', 'wb') as f:
    subprocess.check_call(cmd, stdout=f)

# to read line by line
with open('output.txt') as f:
    for line in f:
        print line,

如果cmd始终要求输入，即使是空的；设置stdin:

If cmd always requires input even an empty one; set stdin:

import os

with open(os.devnull, 'rb') as DEVNULL:
    output = qx(cmd, stdin=DEVNULL) # use subprocess.DEVNULL on Python 3.3+

您可以结合使用这些解决方案，例如，合并stdout/stderr，并将输出保存到文件中，并提供空的输入:

You could combine these solutions e.g., to merge stdout/stderr, and to save the output to a file, and to provide an empty input:

import os
from subprocess import STDOUT, check_call as x

with open(os.devnull, 'rb') as DEVNULL, open('output.txt', 'wb') as f:
    x(cmd, stdin=DEVNULL, stdout=f, stderr=STDOUT)

要将所有输入作为单个字符串提供，可以使用.communicate()方法:

To provide all input as a single string you could use .communicate() method:

#!/usr/bin/env python
from subprocess import Popen, PIPE

cmd = ["python", "test.py"]
p = Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE, universal_newlines=True)
stdout_text, stderr_text = p.communicate(input="1\n\n")

print("stdout: %r\nstderr: %r" % (stdout_text, stderr_text))
if p.returncode != 0:
    raise RuntimeError("%r failed, status code %d" % (cmd, p.returncode))

其中test.py:

print raw_input('abc')[::-1]
raw_input('press enter to exit')

如果与程序的交互更像是对话，则可能不需要 winpexpect模块.这是来自pexpect文档的的示例.

If your interaction with the program is more like a conversation than you might need winpexpect module. Here's an example from pexpect docs:

# This connects to the openbsd ftp site and
# downloads the recursive directory listing.
from winpexpect import winspawn as spawn

child = spawn ('ftp ftp.openbsd.org')
child.expect ('Name .*: ')
child.sendline ('anonymous')
child.expect ('Password:')
child.sendline ('[e-mail]')
child.expect ('ftp> ')
child.sendline ('cd pub')
child.expect('ftp> ')
child.sendline ('get ls-lR.gz')
child.expect('ftp> ')
child.sendline ('bye')

要在Windows上发送诸如F3，F10之类的特殊键，您可能需要 SendKeys模块或其纯Python实现 SendKeys-ctypes .像这样:

To send special keys such as F3, F10 on Windows you might need SendKeys module or its pure Python implementation SendKeys-ctypes. Something like:

from SendKeys import SendKeys

SendKeys(r"""
    {LWIN}
    {PAUSE .25}
    r
    C:\Tools\Dvb_pid_3_0.exe{ENTER}
    {PAUSE 1}
    1{ENTER}
    {PAUSE 1}
    2{ENTER}
    {PAUSE 1}
    {F3}
    {PAUSE 1}
    {F10}
""")

它不捕获输出.

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