如何使用子进程和Popen获取我的.exe的所有输出？

Question

我正在尝试运行可执行文件并使用subprocess.Popen; 但是,我似乎没有得到所有的输出.

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,它会打印比原始exe文件少两行.

我尝试了一种具有相同结果的替代方法:

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()

谁能帮助我获取exe的完整数据？

正如塞巴斯蒂安所说:

原始exe文件最后几行o/p:

-Gdd:通用计数(1 - 1000)

-Cdd:剪切开始于(0 - 99)-Edd:剪切结束于(1 - 100)

请选择以下流文件编号:

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

运行后得到的o/p:

-P0xYYYY      : Pid been interested                                          

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

所以我们可以看到一些缺失的线条.我必须写1并选择值后请选择下面显示的fule数字.

我试图使用ps.stdin.write('1 \n').它没有在exe文件中打印该值

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))

谢谢塞巴斯蒂安.我能够看到整个输出,但无法使用当前代码输入任何输入.

Answer 1

要将所有标准输出作为字符串:

from subprocess import check_output as qx

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

要将stdout和stderr作为单个字符串:

from subprocess import STDOUT

output = qx(cmd, stderr=STDOUT)

要将所有行作为列表:

lines = output.splitlines()

要获取子流程打印的行:

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))

添加stderr=STDOUT到Popen()合并stdout/stderr 的调用.

注意:如果cmd在非交互模式下使用块缓冲,则在缓冲区刷新之前不会显示行.winpexpect模块可能能够更快地获得输出.

要将输出保存到文件:

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总是需要输入,即使是空的; 设定stdin:

import os

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

您可以组合这些解决方案,例如,合并stdout/stderr,并将输出保存到文件,并提供空输入:

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,您可以使用以下.communicate()方法:

#!/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')

如果您与该程序的交互更像是一个对话而不是您可能需要的winpexpect模块.这是docs的一个例子pexpect:

# 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 ('noah@example.com')
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上发送特殊键F3,F10您可能需要SendKeys模块或其纯Python实现SendKeys-ctypes.就像是:

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.