WindowsError: [Error 6] The handle is invalid

[A Former User]

I am trying to develop python plugin on QGIS and I am trying to execute binary programs using subprocess :

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

I get this problem:

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

I searched and look for others who get the same error,they propose to invoke shell = True or use os.popen but it is not working. For information, I am working on Windows 7 64 bits.

[A Former User]

found a partial solution to my problem :

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

It works. but I am embarrased in my plugin with the multiple opens of windows cmd of the programs that are executed. This is not esthetically beautiful for my plugin.

[A Former User]

Solved : I add shell = True

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