Python 3.12 on Windows 10: DLL load failed while importing _winrt_windows_devices_bluetooth

[chrisgeli]

• bleak version: 0.21.1
• Python version: 3.12.2
• Operating System: Windows 10 Pro, build 19045.4170

Description

I am trying to use bleak on Windows 10, but when instantiating BleakScanner, it crashes.

What I Did

Python 3.12.2 (tags/v3.12.2:6abddd9, Feb  6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.                
>>> from bleak import BleakScanner, BleakClient, BleakGATTCharacteristic, BleakError
>>> detection_callback = lambda bt_dev, adv_data : print(f'detection_callback({bt_dev!r}, {adv_data!r})')
>>> bs = BleakScanner(detection_callback)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python3.12\Lib\site-packages\bleak\__init__.py", line 145, in __init__
    get_platform_scanner_backend_type() if backend is None else backend
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python3.12\Lib\site-packages\bleak\backends\scanner.py", line 294, in get_platform_scanner_backend_type
    from bleak.backends.winrt.scanner import BleakScannerWinRT
  File "C:\Python3.12\Lib\site-packages\bleak\backends\winrt\scanner.py", line 8, in <module>
    from winrt.windows.devices.bluetooth.advertisement import (
  File "C:\Python3.12\Lib\site-packages\winrt\windows\devices\bluetooth\__init__.py", line 6, in <module>
    from winrt import _winrt_windows_devices_bluetooth
ImportError: DLL load failed while importing _winrt_windows_devices_bluetooth: The specified module could not be found.

Logs

I repeated the same as above after set BLEAK_LOGGING=1 in my cmd.exe, but no additional log output was generated.

[chrisgeli]

Some additional version information that I thought might be helpful:

python -m pip install bleak==0.21.1
Requirement already satisfied: bleak==0.21.1 in c:\python3.12\lib\site-packages (0.21.1)
Requirement already satisfied: winrt-Windows.Devices.Bluetooth==2.0.0b1 in c:\python3.12\lib\site-packages (from bleak==0.21.1) (2.0.0b1)
Requirement already satisfied: winrt-Windows.Devices.Bluetooth.Advertisement==2.0.0b1 in c:\python3.12\lib\site-packages (from bleak==0.21.1) (2.0.0b1)
Requirement already satisfied: winrt-Windows.Devices.Bluetooth.GenericAttributeProfile==2.0.0b1 in c:\python3.12\lib\site-packages (from bleak==0.21.1) (2.0.0b1)
Requirement already satisfied: winrt-Windows.Devices.Enumeration==2.0.0b1 in c:\python3.12\lib\site-packages (from bleak==0.21.1) (2.0.0b1)
Requirement already satisfied: winrt-Windows.Foundation==2.0.0b1 in c:\python3.12\lib\site-packages (from bleak==0.21.1) (2.0.0b1)
Requirement already satisfied: winrt-Windows.Foundation.Collections==2.0.0b1 in c:\python3.12\lib\site-packages (from bleak==0.21.1) (2.0.0b1)
Requirement already satisfied: winrt-Windows.Storage.Streams==2.0.0b1 in c:\python3.12\lib\site-packages (from bleak==0.21.1) (2.0.0b1)
Requirement already satisfied: winrt-runtime==2.0.0-beta.1 in c:\python3.12\lib\site-packages (from winrt-Windows.Devices.Bluetooth==2.0.0b1->bleak==0.21.1) (2.0.0b1)

The bleak documentation page about the Windows backend states that bleak uses the dlech/bleak-winrt package, but pip's version output seems to suggest the package used is pywinrt/pywinrt?

A potentially related issue: #741

Maybe this is a bug in winrt?

Python 3.12.2 (tags/v3.12.2:6abddd9, Feb  6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import winrt
>>> import winrt.windows
>>> import winrt.windows.devices
>>> import winrt.windows.devices.bluetooth
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python3.12\Lib\site-packages\winrt\windows\devices\bluetooth\__init__.py", line 6, in <module>
from winrt import _winrt_windows_devices_bluetooth
ImportError: DLL load failed while importing _winrt_windows_devices_bluetooth: The specified module could not be found.

[dlech]

The bleak documentation page about the Windows backend states that bleak uses the dlech/bleak-winrt package, but pip's version output seems to suggest the package used is pywinrt/pywinrt?

I fixed the docs now.

Maybe this is a bug in winrt?

Maybe? Does _winrt_windows_devices_bluetooth.pyd exist alongside other similarly named files in C:\Python3.12\Lib\site-packages\winrt\?

[chrisgeli]

Testing with Python 3.11:

The dependencies are completely different:

> python -V
Python 3.11.5
> python -m pip install bleak==0.21.1
Requirement already satisfied: bleak==0.21.1 in c:\users\chris.g\appdata\local\programs\python\python311\lib\site-packages (0.21.1)
Requirement already satisfied: bleak-winrt<2.0.0,>=1.2.0 in c:\users\chris.g\appdata\local\programs\python\python311\lib\site-packages (from bleak==0.21.1) (1.2.0)
Requirement already satisfied: typing-extensions>=4.7.0 in c:\users\chris.g\appdata\local\programs\python\python311\lib\site-packages (from bleak==0.21.1) (4.10.0)

And, importantly, it works:

Python 3.11.5 (tags/v3.11.5:cce6ba9, Aug 24 2023, 14:38:34) [MSC v.1936 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import winrt
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'winrt'
>>> import bleak_winrt
>>> dir(bleak_winrt)
['ExtensionFileLoader', 'ModuleType', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__path__', '__spec__', '_import_ns_module', '_winrt', 'module_from_spec', 'spec_from_loader']
>>> from bleak import BleakScanner, BleakClient, BleakGATTCharacteristic, BleakError
>>> detection_callback = lambda bt_dev, adv_data : print(f'detection_callback({bt_dev!r}, {adv_data!r})')
>>> bs = BleakScanner(detection_callback)
>>> # no exception here ^^

[chrisgeli]

Maybe this is a bug in winrt?

Maybe? Does _winrt_windows_devices_bluetooth.pyd exist alongside other similarly named files in C:\Python3.12\Lib\site-packages\winrt\?

There is a _winrt_windows_devices_bluetooth.pyi file, but none with .pyd extension:

C:\Python3.12\Lib\site-packages\winrt>dir                                                                                          
<...>
29/02/2024  01:45 PM    <DIR>          .                                                                                           
29/02/2024  01:45 PM    <DIR>          ..                                                                                          
29/02/2024  01:45 PM    <DIR>          system                                                                                      
29/02/2024  01:45 PM    <DIR>          windows                                                                                     
29/02/2024  01:45 PM            57,856 _winrt.cp312-win_amd64.pyd                                                                  
29/02/2024  01:45 PM           425,472 _winrt_windows_devices_bluetooth.cp312-win_amd64.pyd                                        
29/02/2024  01:45 PM            22,767 _winrt_windows_devices_bluetooth.pyi                                                        
29/02/2024  01:45 PM           339,968 _winrt_windows_devices_bluetooth_advertisement.cp312-win_amd64.pyd                          
29/02/2024  01:45 PM            13,777 _winrt_windows_devices_bluetooth_advertisement.pyi                                          
29/02/2024  01:45 PM           908,288 _winrt_windows_devices_bluetooth_genericattributeprofile.cp312-win_amd64.pyd                
29/02/2024  01:45 PM            42,632 _winrt_windows_devices_bluetooth_genericattributeprofile.pyi                                
29/02/2024  01:45 PM           500,224 _winrt_windows_devices_enumeration.cp312-win_amd64.pyd                                      
29/02/2024  01:45 PM            19,605 _winrt_windows_devices_enumeration.pyi                                                      
29/02/2024  01:45 PM           325,632 _winrt_windows_foundation.cp312-win_amd64.pyd                                               
29/02/2024  01:45 PM            23,635 _winrt_windows_foundation.pyi                                                               
29/02/2024  01:45 PM           190,464 _winrt_windows_foundation_collections.cp312-win_amd64.pyd                                   
29/02/2024  01:45 PM            14,516 _winrt_windows_foundation_collections.pyi                                                   
29/02/2024  01:45 PM           438,272 _winrt_windows_storage_streams.cp312-win_amd64.pyd                                          
29/02/2024  01:45 PM            27,300 _winrt_windows_storage_streams.pyi                                                          
              15 File(s)      3,350,408 bytes                                                                                      

I just noticed there is _winrt_windows_devices_bluetooth.cp312-win_amd64.pyd, which may be the same thing, but I'm just guessing here.