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  1. Qt
  2. QTBUG-30730

objects registered via qmlRegisterSingletonType are 0 when passed to a Q_INVOKABLE

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    Description

      When registering an object via qmlRegisterSingletonType, the object can't be passed back to C++ properly.

      The attached plugin + qml code shows the behavior, relevant snippets below.

      This might be related to QTBUG-30090.

      plugin.cpp
      ...

void Test_SingletonPlugin::registerTypes(const char *uri)
{
    // @uri Singleton
    qmlRegisterSingletonType<SingletonTest>(uri, 1, 0, "SingletonTest", singleton_provider);
}
      singletontest.cpp
      ...

void
SingletonTest::testSingleton(QObject *obj)
{
    qDebug() << "C++:" << obj;
}
      SingletonTest.qml
      ...

        console.log(rect)
        SingletonTest.testSingleton(rect)
        console.log(SingletonTest)
        SingletonTest.testSingleton(SingletonTest)

...
      Example Output
      QQuickRectangle(0x22edaf0)
C++: QQuickRectangle(0x22edaf0)
SingletonTest(0x22dd330)
C++: QObject(0x0)

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            aalpert Alan Alpert
            saviq Michał Sawicz
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            Dates

              Created:
              Updated:
              Resolved:

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