Moved from win10/python 3.10 to win11/python 3.12.3 and get: The current thread apartment type is not MTA: MAIN_STA...

[vascolp]

Hello everybody,

I have a program that uses kivy and bleak, so bleak is ran in a separate asyncio task.
No threads.
I was on windows 10 and python 3.10.something.
Everything was fine.
I had to upgrade to windows 11 and installed python 3.12.3, bleak 0.22.0.
Now, when I call bleak in a separate task, I get:
"BleakError: The current thread apartment type is not MTA: MAIN_STA. Beware of packages like pywin32 that may change the apartment type implicitly."
But in another program with no tasks, calling bleak directly works just fine.
I am aware of #1556, but that seems to be just the exception throwing.
What is my problem? How can I force the program to use MTA?
Do I have to go back to python 3.10?

Thanks for any help!!
VascoLP

[dlech]

https://bleak.readthedocs.io/en/latest/troubleshooting.html#not-working-when-threading-model-is-sta

does this help?

[vascolp]

That solution of the documentation does not work. I tried to place it in several places... no luck.
Also, you have a typo in the documentation. It is not utils, it is util.
I also tried with python 3.10, no luck either.
Will try with older bleak... 0.20.2.

[vascolp]

python -m pip install bleak==0.20.2:
...
    ERROR: Failed building wheel for bleak-winrt
    Failed to build bleak-winrt
    ERROR: Could not build wheels for bleak-winrt, which is required to install pyproject.toml-based projects

python -m pip install bleak==0.21:
    BleakError: The current thread apartment type is not MTA: MAIN_STA. 

Am I stuck?

[dlech]

Not sure why it was trying to build bleak-winrt instead of downloading a binary wheel for 0.20.2.

You shouldn't be seeing that error in Bleak 0.21.x. I think it was still using cached version of 0.22.0 in that case.

I just opened #1567 with a proposed solution.

[dlech]

To try it, I think you can pip install https://github.com/hbldh/bleak/archive/refs/heads/winrt-allow-sta.zip and then paste the following code snippet in your main python file.

try:
    from bleak.backends.winrt.util import allow_sta
    # tell Bleak we are using a graphical user interface that has been properly
    # configured to work with asyncio
    allow_sta()
except ImportError:
    # other OSes and older versions of Bleak will raise ImportError which we
    # can safely ignore
    pass

[vascolp]

Yes! It works!
Thanks!!!

[dlech]

Great, thanks for testing!

[mantisbug]

To try it, I think you can pip install https://github.com/hbldh/bleak/archive/refs/heads/winrt-allow-sta.zip

I tried:

pip install https://github.com/hbldh/bleak/archive/refs/heads/winrt-allow-sta.zip

Result:

PS C:\PyCharmProjects\companion_em_laptop> pip install https://github.com/hbldh/bleak/archive/refs/heads/winrt-allow-s
ta.zip
Collecting https://github.com/hbldh/bleak/archive/refs/heads/winrt-allow-sta.zip
ERROR: HTTP error 404 while getting https://github.com/hbldh/bleak/archive/refs/heads/winrt-allow-sta.zip
ERROR: Could not install requirement https://github.com/hbldh/bleak/archive/refs/heads/winrt-allow-sta.zip because of
HTTP error 404 Client Error: Not Found for url: https://codeload.github.com/hbldh/bleak/zip/refs/heads/winrt-allow-sta
for URL https://github.com/hbldh/bleak/archive/refs/heads/winrt-allow-sta.zip

I think that update has not arrived in the UK...

[vascolp]

Ok that was only a test version that was included in the latest release.
Upgrade to 0.22.1 and do the thing:

try:
    from bleak.backends.winrt.util import allow_sta
    # tell Bleak we are using a graphical user interface that has been properly
    # configured to work with asyncio
    allow_sta()
except ImportError:
    # other OSes and older versions of Bleak will raise ImportError which we
    # can safely ignore
    pass

[mantisbug]

Thanks, @vascolp, I did so.
My main problem is that my script does not work anymore since I upgraded Bleak to 0.22.1
Working on it.

[mantisbug]

I downgraded Bleak to 0.21.1 and it works again!