[Interest] Issues with QML registration of C++ types (only in Visual Studio Solution)

[Schimkowitsch Robert]

Seems to be a bug in Qt Visual Studio Tools – works when I revert to an older version.
I’ll report it.

Kind regards

Robert

From: Interest <interest-bounces at qt-project.org> On Behalf Of Schimkowitsch Robert
Sent: Friday, 21 March 2025 13:52
To: interest at qt-project.org
Subject: [Interest] Issues with QML registration of C++ types (only in Visual Studio Solution)

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My project contains QML files that will refer to C++ types by name. The QML module and type are registered on startup, the QML file does the right import(s), then I can use C++ classes (QObjects with QML_ELEMENT) as typed entities in QML.
Everything works as expected….when using cmake.

The same project can be built and run using Visual Studio Solution and msbuild.
There, the exact same code fails to register the C++ types properly.

Inside QQmlPrivate::qmlregister, I get into a ‘warning’ branch for all types:

                qWarning().nospace() << "Missing QML.Element class info for "
                                     << type.classInfoMetaObject->className();

I get there because “metaObject->classInfoCount() + offset” returns -1. However, I can verify that I register the C++ class as metatype before I get there (qRegisterMetaType gets called, and a valid id is returned)

Why should classInfo be invalid although the type is registered?
How can I find out what’s wrong (and how to fix it)?

Kind regards

Robert
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