Joseph Fox-Rabinovitz <jfoxrabinov...@gmail.com> added the comment:
Last attempt before I give up:
ctypes.CDLL initializer defined in version 3.8 and beyond as
```
def __init__(self, name, mode=DEFAULT_MODE, handle=None,
use_errno=False,
use_last_error=False,
winmode=None):
```
Documentation says `winmode=0`:
```
class ctypes.CDLL(name, mode=DEFAULT_MODE, handle=None, use_errno=False,
use_last_error=False, winmode=0)
```
Loading of normal DLL from custom directory works when `winmode=0`, but not
when `winmode=None`. To reproduce, any combination of adding the folder
containing the DLL via `os.eviron['PATH'] += os.pathsep + ...`,
`os.add_dll_directory(...)`, `sys.path.append(...)` does not change the
behavior.
Worked prior to 3.8 because there was no `winmode` parameter, `mode` was passed
in diretly, and `ctypes.DEFAULT_MODE == 0`.
I don't know whether it's better to update the code, the docs, or something
else, but based on current info, would prefer updating the code.
Discovery triggered by https://stackoverflow.com/q/59330863/2988730.
Some info summarized in https://stackoverflow.com/a/64472088/2988730.
Link to docs: https://docs.python.org/3.{8,9,10}/library/ctypes.html#ctypes.CDLL
Link to GitHub code:
https://github.com/python/cpython/blob/3.{8,9}/Lib/ctypes/__init__.py#L340
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