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!