我有一个在 Win 2003 上运行良好的简单代码:
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 上这部分;out = proc.communicate()[0]
,挂起。
有人见过这个问题吗?
- 我已经检查过该进程是否真的终止了(启动子进程时没有 PID)
- 制作proc.stdout.readlines()也是一个问题,它也挂了。如何检查标准输出是否有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()
这是有效的场景吗?