Vista style is not loaded

mcmigliore

Hello,
It seems that the plugin loader does not search for the "styles" folder, so the vista style plugin is not loaded (styles\qwindowsvistastyle.dll).
In order to debug, I have set QT_DEBUG_PLUGINS=1 and QT_STYLE_OVERRIDE=vista and here is the output:

QFactoryLoader::QFactoryLoader() checking directory path "D:/myApp/bin/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "D:/myApp/bin/platforms/qwindows.dll"
Found metadata in lib D:/myApp/bin/platforms/qwindows.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "windows"
        ]
    },
    "archreq": 0,
    "className": "QWindowsIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("windows")
loaded library "D:/myApp/bin/platforms/qwindows.dll"
QFactoryLoader::QFactoryLoader() checking directory path "D:/myApp/bin/platformthemes" ...
QApplication: invalid style override passed, ignoring it.
    Available styles: Windows, Fusion
QFactoryLoader::QFactoryLoader() checking directory path "D:/myApp/bin/iconengines" ...
QFactoryLoader::QFactoryLoader() checking directory path "D:/myApp/bin/imageformats" ...
QFactoryLoader::QFactoryLoader() checking directory path "D:/myApp/bin/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "D:/myApp/bin/accessiblebridge" ...

Any idea?
I'm using Qt 5.9
Thanks

SGaist

Hi and welcome to devnet,

Does it happen on a deployed application ?

mcmigliore

Indeed,
It does not happen when I build the application against my system QT.

SGaist

How are you deploying your application ?
Are you using windeployqt ?

mcmigliore

I'm not responsible of the packaging but I don't think windeployqt is used.

SGaist

Then you should try to use windeployqt and check its output with regard to the package you get.