如何处理返回码从Python中的subprocess负数？ [英] How to deal with negative numbers that returncode get from subprocess in Python?

问题描述

这个脚本在python：

  cmd ='installer.exe --install ...'#this works罚款，只是代表许多参数
 process = subprocess.Popen（cmd）
 process.wait（）
 print（process.returncode）
  

这个代码在我看来工作正常，问题是 .returncode 的值。

installer.exe确定，做了很多测试，现在我试图创建一个脚本在python自动化一个测试多天执行此installer.exe 。

installer.exe返回：
- 成功为0;
- 失败和错误是否定的数字

我有一个特定的错误，这是installer.exe返回-307。但是python当执行 print（process.returncode）它显示4294966989 ...我如何处理负数在python，在这种情况下显示-307？ p>

我是python的新用户，env是win7 32和python 3.4。

代码工作
这段代码的运行是运行很多简单的测试：

  import子进程ctypes ，datetime，time 
 nIndex = 0 
 while 1 == 1：
 
 cmd ='installer.exe --reinstall -nTHING NAME'
 = subprocess.Popen（cmd，stdout = subprocess.PIPE）
 
 now = datetime.datetime.now（）
 ret = ctypes.c_int32（process.wait（））.value 
 nIndex = nIndex + 1 
 
 output = str（now）+' - '+ str（nIndex）+' - '+'Ret：'+ str（ret）+'\\\
' 
 
f = open（'test_result.txt'，'a +'）
 f.write（输出）
 f.closed 
 
 print 
  

解决方案

使用NumPy：查看无符号32位int， 4294966989，作为一个有符号的32位int：

 在[39]：np.uint32（4294966989）.view '）
 Out [39]：-307 
  

This piece of script in python:

cmd = 'installer.exe --install ...' #this works fine, the ... just represent many arguments
process = subprocess.Popen(cmd)
process.wait()
print(process.returncode)

This code works fine in my opinion, the problem is the value of .returncode.

The installer.exe is ok, did many test to this, and now i trying to create a script in python to automate a test for many days executing this installer.exe .

The installer.exe return: - Success is 0; - Failure and errors are NEGATIVE numbers

I have a specific error that is -307 that installer.exe return. But python when execute print(process.returncode) its shows 4294966989 ... How can i deal with negative numbers in python, to show in this case the -307?

I am new to python and the env is win7 32 and python 3.4.

EDIT: the final code working The porpose of this code is to run many simple test:

import subprocess, ctypes, datetime, time
nIndex = 0
while 1==1:

   cmd = 'installer.exe --reinstall -n "THING NAME"'
   process = subprocess.Popen( cmd, stdout=subprocess.PIPE )

   now = datetime.datetime.now()
   ret = ctypes.c_int32( process.wait() ).value
   nIndex = nIndex + 1

   output = str( now ) + ' - ' + str( nIndex ) + ' - ' + 'Ret: ' + str( ret ) + '\n'

   f = open( 'test_result.txt', 'a+' )
   f.write( output )
   f.closed

   print( output )

解决方案

Using NumPy: view the unsigned 32-bit int, 4294966989, as a signed 32-bit int:

In [39]: np.uint32(4294966989).view('int32')
Out[39]: -307

这篇关于如何处理返回码从Python中的subprocess负数？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！