WindowsError：[错误6]句柄无效

Question

我试图在QGIS上开发python插件，并尝试使用子进程执行二进制程序：

program = os.path.join(self.tranusConf.tranusBinPath,'pasos' + self.extension)
    if not os.path.isfile(program):
        logging.error('The <pasos> program was not found in %s'%self.tranusBinPath )
        return 0
    outpasos = os.path.join(self.resultDirectory, "outpasos.txt")
    outpasoserr = os.path.join(self.resultDirectory, "outpasoserr.txt")
    args = [program, self.tranusConf.scenarioId, " "]
    result = subprocess.Popen(args,stdout=open(outpasos, "w"), stderr = open(outpasoserr, 'w'), close_fds = False, cwd = self.tranusConf.workingDirectory) # Success! 
    return 1

我有个问题：

An error has occurred while executing Python code: 
     WindowsError: [Error 6] Descripteur non valide  Traceback (most recent call last): File "C:/Users/emna/.qgis2/python/plugins\OptionsTRANUS\launch_tranus_dialog.py", line 109, in run_tranus
            interface.runTranus(tab.spin_box.value())
          File "C:/Users/emna/.qgis2/python/plugins\OptionsTRANUS\LcalInterface.py", line 426, in runTranus
            self.runPasos()
          File "C:/Users/emna/.qgis2/python/plugins\OptionsTRANUS\LcalInterface.py", line 311, in runPasos
            result = subprocess.Popen(args,stdout=open(outpasos, "w"), stderr = open(outpasoserr, 'w'), close_fds = False, cwd = self.tranusConf.workingDirectory) # Success!
          File "C:\OSGEO4~1\apps\Python27\lib\subprocess.py", line 703, in __init__
            errread, errwrite) = self._get_handles(stdin, stdout, stderr)
          File "C:\OSGEO4~1\apps\Python27\lib\subprocess.py", line 839, in _get_handles
            p2cread = self._make_inheritable(p2cread)
          File "C:\OSGEO4~1\apps\Python27\lib\subprocess.py", line 878, in _make_inheritable
        _subprocess.DUPLICATE_SAME_ACCESS)
    WindowsError: [Error 6] Descripteur non valide

我搜索了其他有相同错误的人，他们建议调用shell = True或使用os.popen，但它不起作用。

有关信息，我正在使用Windows 7 64位。

Answer 1

解决:我添加了shell = True

proc = subprocess.Popen(args,shell=True,stdout=open(outimploc, 'w'), stderr=open(outimplocerr,'w'),stdin = subprocess.PIPE, cwd=self.tranusConf.workingDirectory).communicate()

Answer 2

我找到了我的问题的部分解决方案：

devnull = open(os.devnull, 'wb')
result = subprocess.Popen(args,stdout = open(outtrans, "w"), stderr = open(outtranserr,'w'),stdin=devnull, cwd = self.tranusConf.workingDirectory).communicate()

它起作用了。但是，在我的插件中，执行的程序的windows cmd的多次打开使我感到尴尬。这对我的插件来说并不是非常漂亮的。

编辑:与使用stdin=subprocess.PIPE相同