@lurch

from fs.osfs import OSFS
import os
import win32file
import win32con
import pywintypes
from fs.error_tools import convert_os_errors

f = OSFS('./')
path = "test_file.story"
f.create(path)
sys_path = f.getsyspath(path)

fd = os.open(sys_path, os.O_RDWR)

win32file.LockFileEx(
    win32file._get_osfhandle(fd),
    (win32con.LOCKFILE_FAIL_IMMEDIATELY | win32con.LOCKFILE_EXCLUSIVE_LOCK),
    0, -0x10000, pywintypes.OVERLAPPED())

# do this in a new process or something:
new_content = b'123456'
with convert_os_errors("test", sys_path):
    os.write(fd, new_content)


win32file.UnlockFileEx(win32file._get_osfhandle(fd), 0, -0x10000, pywintypes.OVERLAPPED())
os.close(fd)

haven't gotten this working but something like this and you could try creating another process that interacts with the file while there is a lock on it. Or you could use an application like storyline 360 that holds a lock on a file to test and have that file open while you run a script that attempts to write to it. Both should work but haven't tried it myself.

idk if thats what you were looking for

Bug in convert_os_errors #484

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