Details
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Bug
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Resolution: Unresolved
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P3: Somewhat important
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None
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5.12.3
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None
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Windows
Description
It's impossible to embed PySide2 into an application build against Qt 5.12.4 MSVC2017:
PySide2 as installed with pip3 ships its own copy of the Qt dlls. Then within sources/pyside2/PySide2/_init_.py.in we run into:
if sys.platform == 'win32': # PATH has to contain the package directory, otherwise plugins # won't be able to find their required Qt libraries (e.g. the # svg image plugin won't find Qt5Svg.dll). os.environ['PATH'] = pyside_package_dir + os.pathsep + os.environ['PATH']
Now, if you try to embed PySide into a Qt application using a different ABI than whatever is shiped with PySide, you can run into quite opaque errors such as:
ImportError: DLL load failed: The specified procedure could not be found.
or:
Exception thrown at 0x00007FF98554EB78 (ntdll.dll) in tst_python.exe: 0xC0000139: Entry Point Not Found.
In our case this is happening because some Qt libraries where loaded already using the MSVC 2017 ABI and then others where tried to be loaded from the PySide2 folder, using whatever ABI gets shipped there.
Using the VS debugger, I saw the following list of loaded libs at the point the exception is triggered:
Qt5Test.dll Qt5Test.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Test.dll N/A Yes Symbols loaded. C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Test.pdb 13 5.12.4.0 6/13/2019 5:41 AM 00007FF9670D0000-00007FF967112000 [11584] tst_python.exe Qt5Widgets.dll Qt5Widgets.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Widgets.dll N/A Yes Automatic symbol loading is disabled. 23 5.12.4.0 6/13/2019 5:40 AM 00007FF940900000-00007FF940E59000 [11584] tst_python.exe Qt5Gui.dll Qt5Gui.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Gui.dll N/A Yes Automatic symbol loading is disabled. 25 5.12.4.0 6/13/2019 5:36 AM 00007FF9402C0000-00007FF9408FF000 [11584] tst_python.exe Qt5Core.dll Qt5Core.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Core.dll N/A Yes Automatic symbol loading is disabled. 27 5.12.4.0 6/13/2019 5:32 AM 00007FF93F460000-00007FF93FA49000 [11584] tst_python.exe Qt5Xml.dll Qt5Xml.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Xml.dll N/A Yes Automatic symbol loading is disabled. 42 5.12.4.0 6/13/2019 5:32 AM 00007FF966F30000-00007FF966F63000 [11584] tst_python.exe Qt5XmlPatterns.dll Qt5XmlPatterns.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5XmlPatterns.dll N/A Yes Automatic symbol loading is disabled. 43 5.12.4.0 6/13/2019 6:31 AM 0000000053770000-0000000053A9F000 [11584] tst_python.exe Qt5Network.dll Qt5Network.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Network.dll N/A Yes Automatic symbol loading is disabled. 60 5.12.4.0 6/13/2019 5:36 AM 00007FF951100000-00007FF951249000 [11584] tst_python.exe Qt5Qml.dll Qt5Qml.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Qml.dll N/A Yes Automatic symbol loading is disabled. 88 5.12.4.0 6/13/2019 6:23 AM 00007FF93F070000-00007FF93F45C000 [11584] tst_python.exe Qt5QuickWidgets.dll Qt5QuickWidgets.dll C:\Python36\Lib\site-packages\PySide2\Qt5QuickWidgets.dll N/A Yes Automatic symbol loading is disabled. 103 5.12.4.0 6/27/2019 6:49 PM 00007FF968E60000-00007FF968E76000 [11584] tst_python.exe Qt5WebEngineWidgets.dll Qt5WebEngineWidgets.dll C:\Python36\Lib\site-packages\PySide2\Qt5WebEngineWidgets.dll N/A Yes Automatic symbol loading is disabled. 104 5.12.4.0 6/27/2019 11:22 PM 00007FF962910000-00007FF96294C000 [11584] tst_python.exe Qt53DCore.dll Qt53DCore.dll C:\Python36\Lib\site-packages\PySide2\Qt53DCore.dll N/A Yes Automatic symbol loading is disabled. 105 5.12.4.0 6/27/2019 7:03 PM 00007FF95A5A0000-00007FF95A600000 [11584] tst_python.exe Qt53DRender.dll Qt53DRender.dll C:\Python36\Lib\site-packages\PySide2\Qt53DRender.dll N/A Yes Automatic symbol loading is disabled. 106 5.12.4.0 6/27/2019 7:07 PM 00007FF9416E0000-00007FF94190D000 [11584] tst_python.exe Qt5Quick.dll Qt5Quick.dll C:\Python36\Lib\site-packages\PySide2\Qt5Quick.dll N/A Yes Automatic symbol loading is disabled. 109 5.12.4.0 6/27/2019 6:48 PM 00007FF93BDC0000-00007FF93C166000 [11584] tst_python.exe Qt5PrintSupport.dll Qt5PrintSupport.dll C:\Python36\Lib\site-packages\PySide2\Qt5PrintSupport.dll N/A Yes Automatic symbol loading is disabled. 111 5.12.4.0 6/27/2019 12:52 AM 00007FF959580000-00007FF9595D2000 [11584] tst_python.exe Qt5WebEngineCore.dll Qt5WebEngineCore.dll C:\Python36\Lib\site-packages\PySide2\Qt5WebEngineCore.dll N/A Yes Automatic symbol loading is disabled. 112 5.12.4.0 6/27/2019 11:06 PM 00007FF935FB0000-00007FF93AD29000 [11584] tst_python.exe Qt5Concurrent.dll Qt5Concurrent.dll C:\Python36\Lib\site-packages\PySide2\Qt5Concurrent.dll N/A Yes Automatic symbol loading is disabled. 113 5.12.4.0 6/27/2019 12:47 AM 00007FF97A7A0000-00007FF97A7AC000 [11584] tst_python.exe ~ clipboard | grep Qt5 Qt5Test.dll Qt5Test.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Test.dll N/A Yes Symbols loaded. C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Test.pdb 13 5.12.4.0 6/13/2019 5:41 AM 00007FF9670D0000-00007FF967112000 [11584] tst_python.exe Qt5Widgets.dll Qt5Widgets.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Widgets.dll N/A Yes Automatic symbol loading is disabled. 23 5.12.4.0 6/13/2019 5:40 AM 00007FF940900000-00007FF940E59000 [11584] tst_python.exe Qt5Gui.dll Qt5Gui.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Gui.dll N/A Yes Automatic symbol loading is disabled. 25 5.12.4.0 6/13/2019 5:36 AM 00007FF9402C0000-00007FF9408FF000 [11584] tst_python.exe Qt5Core.dll Qt5Core.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Core.dll N/A Yes Automatic symbol loading is disabled. 27 5.12.4.0 6/13/2019 5:32 AM 00007FF93F460000-00007FF93FA49000 [11584] tst_python.exe Qt5Xml.dll Qt5Xml.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Xml.dll N/A Yes Automatic symbol loading is disabled. 42 5.12.4.0 6/13/2019 5:32 AM 00007FF966F30000-00007FF966F63000 [11584] tst_python.exe Qt5XmlPatterns.dll Qt5XmlPatterns.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5XmlPatterns.dll N/A Yes Automatic symbol loading is disabled. 43 5.12.4.0 6/13/2019 6:31 AM 0000000053770000-0000000053A9F000 [11584] tst_python.exe Qt5Network.dll Qt5Network.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Network.dll N/A Yes Automatic symbol loading is disabled. 60 5.12.4.0 6/13/2019 5:36 AM 00007FF951100000-00007FF951249000 [11584] tst_python.exe Qt5Qml.dll Qt5Qml.dll C:\Qt-online\5.12.4\msvc2017_64\bin\Qt5Qml.dll N/A Yes Automatic symbol loading is disabled. 88 5.12.4.0 6/13/2019 6:23 AM 00007FF93F070000-00007FF93F45C000 [11584] tst_python.exe Qt5QuickWidgets.dll Qt5QuickWidgets.dll C:\Python36\Lib\site-packages\PySide2\Qt5QuickWidgets.dll N/A Yes Automatic symbol loading is disabled. 103 5.12.4.0 6/27/2019 6:49 PM 00007FF968E60000-00007FF968E76000 [11584] tst_python.exe Qt5WebEngineWidgets.dll Qt5WebEngineWidgets.dll C:\Python36\Lib\site-packages\PySide2\Qt5WebEngineWidgets.dll N/A Yes Automatic symbol loading is disabled. 104 5.12.4.0 6/27/2019 11:22 PM 00007FF962910000-00007FF96294C000 [11584] tst_python.exe Qt53DCore.dll Qt53DCore.dll C:\Python36\Lib\site-packages\PySide2\Qt53DCore.dll N/A Yes Automatic symbol loading is disabled. 105 5.12.4.0 6/27/2019 7:03 PM 00007FF95A5A0000-00007FF95A600000 [11584] tst_python.exe Qt53DRender.dll Qt53DRender.dll C:\Python36\Lib\site-packages\PySide2\Qt53DRender.dll N/A Yes Automatic symbol loading is disabled. 106 5.12.4.0 6/27/2019 7:07 PM 00007FF9416E0000-00007FF94190D000 [11584] tst_python.exe Qt5Quick.dll Qt5Quick.dll C:\Python36\Lib\site-packages\PySide2\Qt5Quick.dll N/A Yes Automatic symbol loading is disabled. 109 5.12.4.0 6/27/2019 6:48 PM 00007FF93BDC0000-00007FF93C166000 [11584] tst_python.exe Qt5PrintSupport.dll Qt5PrintSupport.dll C:\Python36\Lib\site-packages\PySide2\Qt5PrintSupport.dll N/A Yes Automatic symbol loading is disabled. 111 5.12.4.0 6/27/2019 12:52 AM 00007FF959580000-00007FF9595D2000 [11584] tst_python.exe Qt5WebEngineCore.dll Qt5WebEngineCore.dll C:\Python36\Lib\site-packages\PySide2\Qt5WebEngineCore.dll N/A Yes Automatic symbol loading is disabled. 112 5.12.4.0 6/27/2019 11:06 PM 00007FF935FB0000-00007FF93AD29000 [11584] tst_python.exe Qt5Concurrent.dll Qt5Concurrent.dll C:\Python36\Lib\site-packages\PySide2\Qt5Concurrent.dll N/A Yes Automatic symbol loading is disabled. 113 5.12.4.0 6/27/2019 12:47 AM 00007FF97A7A0000-00007FF97A7AC000 [11584] tst_python.exe
From ProcMon.exe it looks like QtQuick is tried to be loaded but then loading QtQml fails - quite probably due to an ABI incompatibility.
Possible solutions:
- append instead of prepend to the PATH variable
- make it possible to install pyside through MaintenanceTool