Eryk Sun <[email protected]> added the comment:
It has to be a ValueError since the error is an invalid parameter at the Python
level. Similarly, in 3.6+ when using bytes paths in Windows, for which Python
uses UTF-8 as the file-system encoding, os.path.exists() may raise
UnicodeDecodeError:
>>> try:
... os.path.exists(b'\xc8spam')
... except ValueError as e: err = e
...
>>> err
UnicodeDecodeError('utf-8', b'\xc8spam', 0, 1, 'invalid continuation byte')
There's no practical support for NUL in paths in any OS as far as I know. In
principle, the native NT API of Windows allows NUL in device names since it
uses counted strings. However, Python only supports the Windows API, which uses
null-terminated strings. So, practically speaking, not supporting NUL in paths
is not an issue.
Here's an example of using an NT device name that contains a NUL character. It
creates a DOS 'device' named "A\x00B" that targets "C:\\Temp". It's like a
SUBST drive, but with any device name instead of just a drive-letter name. I
omitted the ctypes definitions for brevity.
obja = OBJECT_ATTRIBUTES("\\??\\A\x00B")
target = UNICODE_STRING("\\??\\C:\\Temp")
handle = ctypes.c_void_p()
NtCreateSymbolicLinkObject(ctypes.byref(handle), GENERIC_ALL,
ctypes.byref(obja), ctypes.byref(target))
Query the timestamps of the "A\x00B" device:
info = (ctypes.c_ulonglong * 5)()
NtQueryAttributesFile(ctypes.byref(obja), info)
times = (ctypes.c_int * 4)()
for i in range(4):
RtlTimeToSecondsSince1970(ctypes.byref(info, i*8),
ctypes.byref(times, i*4))
Verify that the creation, last access, and last write times are the same as
"C:\\Temp":
s = os.stat('C:\\Temp')
times2 = [int(x) for x in (s.st_ctime, s.st_atime, s.st_mtime)]
>>> times[:3] == times2
True
(The fourth timestamp is the change time, which isn't supported in Windows
Python for legacy reasons that also relate to the bizarre use of st_ctime for
the creation time, instead of st_birthtime.)
----------
nosy: +eryksun
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