Question

我有一个简单的代码，可以在Win 2003上正常工作：

proc = subprocess.Popen('<some python script which runs another process>', stdout = subprocess.PIPE, stderr = subprocess.PIPE, stdin = subprocess.PIPE)
out = proc.communicate()[0]

但是在Windows 8这部分; out = proc.communicate()[0]，挂起。

有人看过这个问题吗？

我已检查过程是否真的已经过时（启动子进程时PID不存在）
制作proc.stdout.readlines（）也是一个问题，它也会挂起。如何检查stdout是否有EOF？
当我停止子进程proc.communicate（）工作正常。

这是最简单的例子：

import subprocess
proc = subprocess.Popen([sys.executable, "D:\\test.py"], stdout = subprocess.PIPE)
print 'PID', proc.pid #When this PID is printed I see in the taskbr that process is already finished
print 'Output', proc.communicate() # but this part is hangs

和代码od test.py：

import os, time
from subprocess import Popen, PIPE

CREATE_NEW_PROCESS_GROUP = 0x00000200  # note: could get it from subprocess
DETACHED_PROCESS = 0x00000008          # 0x8 | 0x200 == 0x208


p = Popen("start /B notepad", shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE,
          creationflags=DETACHED_PROCESS | CREATE_NEW_PROCESS_GROUP)
print 'Done'
exit()

这是有效的情况吗？

Answer 1

要允许.communicate()返回而不等待孙子（记事本）退出，您可以尝试test.py：

import sys
from subprocess import Popen, PIPE

CREATE_NEW_PROCESS_GROUP = 0x00000200
DETACHED_PROCESS = 0x00000008

p = Popen('grandchild', stdin=PIPE, stdout=PIPE, stderr=PIPE,
          creationflags=DETACHED_PROCESS | CREATE_NEW_PROCESS_GROUP)

请参阅Popen waiting for child process even when the immediate child has terminated。

如果父进程创建了一个子进程，则subprocess.communicate（）在Windows 8上挂起

1 个答案: