I also changed the QT_DEBUG_PLUGINS variable to 1 which printed out the locations Qt is looking for plugins. I changed the QT_PLUGIN_PATH variable on the local command prompt to include the directory above, but the same error prevailed. The qwindows.dll is included in the OSGeo4W installation under: C:\OSGeo4W\apps\Qt5\plugins\platforms After some research, I found its the qwindows.dll that qt uses. I have followed the instructions in the following QGIS help doc under the section: "Using PyQGIS in Custom Applications"Īfter attempting to run the script I realized a dll plugin was missing. I am using a Python 3.7 installation separate from what comes with OSGeo4W and attempting to integrate qgis functionality. I currently am sticking with the OSGeo4W web installer installation. I've attempted using various installs of qgis 3.x including the standalone installer and OSGeo4W web installer. I am implementing qgis 3.4.3 in a custom application, but when I instantiate the QgsApplication() class, I receive the error "Could not find the Qt platform plugin "Windows" in "".
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