WindowsError: [Error 0] The operation completed successfully for exe() after upgrading to 5.5.0

Tested with Python 2.7.13 and 3.7.1, Windows 10 1809 (10.0.17763.0). psutil version: 5.5.0

It fails on ‘Secure System’ process, only when Python was run as an Administrator:

Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:53:40) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import psutil
>>> [p for p in psutil.process_iter()]
[psutil.Process(pid=0, name='System Idle Process', started='2018-11-06 04:18:12'), psutil.Process(pid=4, name='System', started='2018-11-06 04:18:12'), Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python27\lib\site-packages\psutil\__init__.py", line 395, in __str__
    info["name"] = self.name()
  File "C:\Python27\lib\site-packages\psutil\__init__.py", line 609, in name
    name = self._proc.name()
  File "C:\Python27\lib\site-packages\psutil\_pswindows.py", line 635, in wrapper
    return fun(self, *args, **kwargs)
  File "C:\Python27\lib\site-packages\psutil\_pswindows.py", line 687, in name
    return py2_strencode(os.path.basename(self.exe()))
  File "C:\Python27\lib\site-packages\psutil\_pswindows.py", line 635, in wrapper
    return fun(self, *args, **kwargs)
  File "C:\Python27\lib\site-packages\psutil\_pswindows.py", line 701, in exe
    return py2_strencode(convert_dos_path(cext.proc_exe(self.pid)))
WindowsError: [Error 0] The operation completed successfully

[giampaolo]

Avoiding to convert the DOS/win32 path format would be a clear win. Before proceeding though I would investigate how both APIs behave and if there are differences in terms of returned paths and (above all) permissions. QueryFullProcessImageNameW may work better but we should first make sure it won’t result in more AccessDenied exceptions.

[giampaolo]

OK, I also included Win XP support (not tested though). Closing this out as fixed. Thank you guys for the support.