Could not load the Qt platform plugin "windows" even though it was found

memyselfandi

I am writing a bunch of unit-tests for my pyqgis-code on my windows-machine:

import unittest

from qgis.core import QgsApplication

QgsApplication.setPrefixPath(r"C:\OSGeo4W\apps\qgis-ltr", True)
qgis_app = QgsApplication([], False) 
qgis_app.initQgis() 

class MyTestClass(unittest.TestCase):
    def test_my_function(self):
        pass

if __name__ == '__main__':
    unittest.main()

# Schritt 2: QGIS-Ressourcen freigeben
qgis_app.exitQgis()

my env-variables are this:

Path=C:\OSGeo4W\apps\qgis-ltr\bin;C:\OSGeo4W\apps\qt5\bin;C:\OSGeo4W\apps\Python312\Scripts;C:\OSGeo4W\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32\WBem;c:\Users\myuser\.vscode\extensions\ms-python.debugpy-2025.4.1-win32-x64\bundled\scripts\noConfigScripts
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.PY;.PYW
QT_DEBUG_PLUGINS=1
PYTHONHOME=C:\OSGeo4W\apps\Python312
PYTHONPATH=C:\OSGeo4W\apps\qgis-ltr\python
GDAL_DATA=C:\OSGEO4W\share\gdal
GDAL_DRIVER_PATH=C:\OSGEO4W\bin\gdalplugins
GDAL_FILENAME_IS_UTF8=YES
GS_LIB=C:\OSGeo4W\apps\gs\lib
GEOTIFF_CSV=C:\OSGEO4W\share\epsg_csv
O4W_QT_BINARIES=C:\OSGEO4W\apps\Qt5\bin
O4W_QT_DOC=C:\OSGEO4W\apps\Qt5\doc
O4W_QT_HEADERS=C:\OSGEO4W\apps\Qt5\include
O4W_QT_LIBRARIES=C:\OSGEO4W\apps\Qt5\lib
O4W_QT_PLUGINS=C:\OSGEO4W\apps\Qt5\plugins
O4W_QT_PREFIX=C:\OSGEO4W\apps\Qt5
O4W_QT_TRANSLATIONS=C:\OSGEO4W\apps\Qt5\translations
OSGEO4W_ROOT=C:\OSGeo4W
QT_PLUGIN_PATH=C:\OSGEO4W\apps\qgis-ltr\qtplugins;C:\OSGEO4W\apps\qt5\plugins
QT_QPA_PLATFORM_PLUGIN_PATH=C:\OSGeo4W\apps\Qt5\plugin
QGIS_PREFIX_PATH=C:\OSGEO4W\apps\qgis-ltr

However when I run my test I get the following error:

Cannot load library C:\OSGEO4W\apps\qt5\plugins\platforms\qwindows.dll: Die angegebene Prozedur wurde nicht gefunden

This is the entire debug-output:

QFactoryLoader::QFactoryLoader() checking directory path "C:/OSGEO4W/apps/qgis-ltr/qtplugins" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/OSGEO4W/apps/qt5/plugins" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/myuser/AppData/Roaming/Python/Python312/site-packages/PyQt5/Qt5/plugins" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/OSGeo4W/bin" ...
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/adal.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/adal.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/adrg.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/adrg.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/arrow.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/arrow.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/arrow_acero.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/arrow_acero.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/arrow_dataset.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/arrow_dataset.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/blosc.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/blosc.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/brotlicommon.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/brotlicommon.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/brotlidec.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/brotlidec.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/brotlienc.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/brotlienc.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/cairo.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/cairo.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/cblas.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/cblas.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/charset-1.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/charset-1.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/concrt140.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/concrt140.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/exiv2.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/exiv2.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/freetype.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/freetype.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/freexl.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/freexl.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/gdal309.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/gdal309.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/geos.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/geos.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/geos_c.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/geos_c.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/geotiff.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/geotiff.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/gsdll64.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/gsdll64.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/gsl.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/gsl.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/hdf.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/hdf.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/hdf5.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/hdf5.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/hdf5_cpp.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/hdf5_cpp.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/hdf5_hl.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/hdf5_hl.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/hdf5_hl_cpp.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/hdf5_hl_cpp.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/hdf5_tools.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/hdf5_tools.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/hpdf.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/hpdf.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/iconv-2.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/iconv-2.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icudt.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icudt.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icudt67.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icudt67.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icuin.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icuin.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icuin67.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icuin67.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icuio.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icuio.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icuio67.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icuio67.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icutest.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icutest.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icutest67.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icutest67.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icutu.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icutu.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icutu67.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icutu67.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icuuc.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icuuc.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/icuuc67.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/icuuc67.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/jpeg62.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/jpeg62.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/jxl.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/jxl.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/jxl_cms.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/jxl_cms.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/jxl_threads.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/jxl_threads.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/laszip3.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/laszip3.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/laszip_api3.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/laszip_api3.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/Lerc.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/Lerc.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libcrypto-3-x64.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libcrypto-3-x64.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libcurl.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libcurl.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libexpat.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libexpat.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libexslt.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libexslt.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/liblas.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/liblas.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/liblas_c.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/liblas_c.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/liblzma.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/liblzma.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libmysql.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libmysql.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libpdal_plugin_kernel_fauxplugin.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libpdal_plugin_kernel_fauxplugin.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libpdal_plugin_reader_pgpointcloud.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libpdal_plugin_reader_pgpointcloud.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libpdal_plugin_writer_pgpointcloud.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libpdal_plugin_writer_pgpointcloud.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libpng16.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libpng16.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libpq.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libpq.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/librttopo.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/librttopo.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libsharpyuv.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libsharpyuv.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libssl-3-x64.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libssl-3-x64.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libwebp.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libwebp.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libwebpdecoder.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libwebpdecoder.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libwebpdemux.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libwebpdemux.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libwebpmux.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libwebpmux.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libxml2.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libxml2.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/libxslt.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/libxslt.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/lti_dsdk_9.5.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/lti_dsdk_9.5.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/lti_dsdk_cdll_9.5.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/lti_dsdk_cdll_9.5.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/lti_lidar_dsdk_1.1.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/lti_lidar_dsdk_1.1.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/lz4.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/lz4.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/mfhdf.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/mfhdf.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/mod_spatialite.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/mod_spatialite.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/msodbcdiag18.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/msodbcdiag18.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/msodbcsql18.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/msodbcsql18.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/msvcp140.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/msvcp140.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/msvcp140_1.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/msvcp140_1.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/msvcp140_2.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/msvcp140_2.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/msvcp140_atomic_wait.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/msvcp140_atomic_wait.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/msvcp140_codecvt_ids.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/msvcp140_codecvt_ids.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/NCSEcw.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/NCSEcw.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/netcdf.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/netcdf.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/oci.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/oci.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/ogdi.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/ogdi.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/openjp2.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/openjp2.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/openjpip.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/openjpip.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/oraociicus.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/oraociicus.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/parquet.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/parquet.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/pdalcpp.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/pdalcpp.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/poppler.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/poppler.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/proj_9.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/proj_9.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/python3.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/python3.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/python312.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/python312.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/remote.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/remote.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/rpf.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/rpf.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/skeleton.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/skeleton.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/spatialindex-64.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/spatialindex-64.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/spatialindex_c-64.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/spatialindex_c-64.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/spatialite.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/spatialite.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/sqlite3.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/sqlite3.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/szip.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/szip.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/tbb.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/tbb.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/thriftmd.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/thriftmd.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/thriftzmd.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/thriftzmd.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/tiff.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/tiff.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/turbojpeg.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/turbojpeg.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/vcamp140.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/vcamp140.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/vccorlib140.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/vccorlib140.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/vcomp140.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/vcomp140.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/vcruntime140.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/vcruntime140.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/vcruntime140_1.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/vcruntime140_1.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/vcruntime140_threads.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/vcruntime140_threads.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/vrf.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/vrf.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxbase32u_net_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxbase32u_net_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxbase32u_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxbase32u_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxbase32u_xml_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxbase32u_xml_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_adv_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_adv_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_aui_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_aui_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_core_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_core_vc_x64_osgeo4w.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_gl_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_gl_vc_x64_osgeo4w.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_html_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_html_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_media_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_media_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_propgrid_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_propgrid_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_qa_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_qa_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_ribbon_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_ribbon_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_richtext_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_richtext_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_stc_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_stc_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_webview_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_webview_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/wxmsw32u_xrc_vc_x64_osgeo4w.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/wxmsw32u_xrc_vc_x64_osgeo4w.dll'" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/xerces-c_3_2.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/xerces-c_3_2.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/zip.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/zip.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/zlib.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/zlib.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "C:/OSGeo4W/bin/zstd.dll"
"Failed to extract plugin meta data from 'C:/OSGeo4W/bin/zstd.dll'"
         not a plugin
QFactoryLoader::QFactoryLoader() checking directory path "C:/OSGEO4W/apps/qgis-ltr/qtplugins/platforms" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/OSGEO4W/apps/qt5/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "C:/OSGEO4W/apps/qt5/plugins/platforms/qdirect2d.dll"
Found metadata in lib C:/OSGEO4W/apps/qt5/plugins/platforms/qdirect2d.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "direct2d"
        ]
    },
    "archreq": 0,
    "className": "QWindowsDirect2DIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("direct2d")
QFactoryLoader::QFactoryLoader() looking at "C:/OSGEO4W/apps/qt5/plugins/platforms/qminimal.dll"
Found metadata in lib C:/OSGEO4W/apps/qt5/plugins/platforms/qminimal.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "C:/OSGEO4W/apps/qt5/plugins/platforms/qoffscreen.dll"
Found metadata in lib C:/OSGEO4W/apps/qt5/plugins/platforms/qoffscreen.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "C:/OSGEO4W/apps/qt5/plugins/platforms/qwebgl.dll"
Found metadata in lib C:/OSGEO4W/apps/qt5/plugins/platforms/qwebgl.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 0,
    "className": "QWebGLIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("webgl")
QFactoryLoader::QFactoryLoader() looking at "C:/OSGEO4W/apps/qt5/plugins/platforms/qwindows.dll"
Found metadata in lib C:/OSGEO4W/apps/qt5/plugins/platforms/qwindows.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "windows"
        ]
    },
    "archreq": 0,
    "className": "QWindowsIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("windows")
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/myuser/AppData/Roaming/Python/Python312/site-packages/PyQt5/Qt5/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Users/myuser/AppData/Roaming/Python/Python312/site-packages/PyQt5/Qt5/plugins/platforms/qminimal.dll"
Found metadata in lib C:/Users/myuser/AppData/Roaming/Python/Python312/site-packages/PyQt5/Qt5/plugins/platforms/qminimal.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "C:/Users/myuser/AppData/Roaming/Python/Python312/site-packages/PyQt5/Qt5/plugins/platforms/qoffscreen.dll"
Found metadata in lib C:/Users/myuser/AppData/Roaming/Python/Python312/site-packages/PyQt5/Qt5/plugins/platforms/qoffscreen.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "C:/Users/myuser/AppData/Roaming/Python/Python312/site-packages/PyQt5/Qt5/plugins/platforms/qwebgl.dll"
Found metadata in lib C:/Users/myuser/AppData/Roaming/Python/Python312/site-packages/PyQt5/Qt5/plugins/platforms/qwebgl.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 0,
    "className": "QWebGLIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("webgl")
QFactoryLoader::QFactoryLoader() looking at "C:/Users/myuser/AppData/Roaming/Python/Python312/site-packages/PyQt5/Qt5/plugins/platforms/qwindows.dll"
Found metadata in lib C:/Users/myuser/AppData/Roaming/Python/Python312/site-packages/PyQt5/Qt5/plugins/platforms/qwindows.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "windows"
        ]
    },
    "archreq": 0,
    "className": "QWindowsIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("windows")
QFactoryLoader::QFactoryLoader() checking directory path "C:/OSGeo4W/bin/platforms" ...
Cannot load library C:\OSGEO4W\apps\qt5\plugins\platforms\qwindows.dll: Die angegebene Prozedur wurde nicht gefunden.
QLibraryPrivate::loadPlugin failed on "C:/OSGEO4W/apps/qt5/plugins/platforms/qwindows.dll" : "Cannot load library C:\\OSGEO4W\\apps\\qt5\\plugins\\platforms\\qwindows.dll: Die angegebene Prozedur wurde nicht gefunden."
qt.qpa.plugin: Could not load the Qt platform plugin "windows" in "C:\OSGeo4W\apps\Qt5\plugin" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: direct2d, minimal, offscreen, webgl, windows.

As you can see the qwindow.dll was found two times: once within C:/Users/myuser/AppData/Roaming/Python/Python312/site-packages/PyQt5/Qt5/plugins/platforms and once in C:/OSGEO4W/apps/qt5/plugins/platforms. However both libs seem to have the exact same version, so that shouldn't be a big problem from my perspective. Have I missed something?

JonB

@memyselfandi said in Could not load the Qt platform plugin "windows" even though it was found:

Cannot load library C:\OSGEO4W\apps\qt5\plugins\platforms\qwindows.dll: Die angegebene Prozedur wurde nicht gefunden.
QLibraryPrivate::loadPlugin failed on "C:/OSGEO4W/apps/qt5/plugins/platforms/qwindows.dll" : "Cannot load library C:\\OSGEO4W\\apps\\qt5\\plugins\\platforms\\qwindows.dll: Die angegebene Prozedur wurde nicht gefunden."
qt.qpa.plugin: Could not load the Qt platform plugin "windows" in "C:\OSGeo4W\apps\Qt5\plugin" even though it was found.

Die angegebene Prozedur wurde nicht gefunden

This message must be the English: "The specified procedure could not be found". That tends to mean the file is found but it does not contain whatever procedure the code is trying to call for it. I do not know what that procedure is, but check correct version and architecture. Sorry I do not know more than that.

memyselfandi

I do not know what that procedure is

Me neither.

but check correct version and architecture

well, my OS is Win10 Enterprise 64bit, as well as my version for python:

Python 3.12.8 (main, Dec 20 2024, 15:21:15) [MSC v.1938 64 bit (AMD64)] on win32

qt is 5.15.13.

hskoglund

That error "The specified procedure could not be found" seems to occur often for OSGeo4W apps, for example here is one quite similar:
https://forum.qt.io/topic/112321/how-to-get-dlls-from-qt5-to-work-with-python-standalone-script-using-pyqgis-pyqt5/5

Maybe the solution for that one also works for you.

JonB · qt is 5.15.13.

@memyselfandi
The link @hskoglund has got found really looks like it is just your issue and should resolve!

Jane Suza

This post is deleted!

memyselfandi

Unfortunately that post didn't help. Nothing in the qt-log provided in my questions makes me assume there's some "incompatible Qt library" as mentioned in the first anwer in that post.

Also calling %OSGEO4W_ROOT%\bin\qt5_env.bat didn't help. What the script effectivly does from my understanding, is setting some env-variables:

set QT_PLUGIN_PATH=%OSGEO4W_ROOT%\apps\Qt5\plugins

set O4W_QT_PREFIX=%OSGEO4W_ROOT:\=/%/apps/Qt5
set O4W_QT_BINARIES=%OSGEO4W_ROOT:\=/%/apps/Qt5/bin
set O4W_QT_PLUGINS=%OSGEO4W_ROOT:\=/%/apps/Qt5/plugins
set O4W_QT_LIBRARIES=%OSGEO4W_ROOT:\=/%/apps/Qt5/lib
set O4W_QT_TRANSLATIONS=%OSGEO4W_ROOT:\=/%/apps/Qt5/translations
set O4W_QT_HEADERS=%OSGEO4W_ROOT:\=/%/apps/Qt5/include
set O4W_QT_DOC=%OSGEO4W_ROOT:\=/%/apps/Qt5/doc

which - as you can see in my question - are already set appropriately ( %OSGEO4W_ROOT% refers to C:\OSGEO4W on my machine).

jsulm

@memyselfandi said in Could not load the Qt platform plugin "windows" even though it was found:

so that shouldn't be a big problem from my perspective

But it can. Make sure only the correct Qt files are found (like cleaning up PATH variable).

memyselfandi

This post is deleted!

memyselfandi

@jsulm I renamed the C:\Users\myuser\AppData\Roaming\Python\Python312\site-packages\PyQt5\Qt5\plugins\platforms-folder so that qt won't find it any more. However that didn't change anything. The error remains the same (except the entries for the forementioned folder don't appear in the debug-log any more).

However when I were to delete the other directoy C:\OSGeo4W\apps\Qt5\plugins\platforms1, it seems to work. Not sure, if this is really a good thing, but at least it's a step further.

jsulm

@memyselfandi Important is to not to mix different Qt versions