Question

In C++ code below I load a qml file. But c++ slot not working. No error or warnings occurs but debug message is always “a” character. No “b” character appears. Can you tell me why? Thanks.

c++ side code

    ::::::::::::::
    view=new QDeclarativeView;
    view->setSource(QUrl("qml/groundMenu/Ground.qml"));
    rootObject = dynamic_cast<QObject*>(view->rootObject());
    QObject::connect(rootObject, SIGNAL(qmlSignal()),this, SLOT(qmlLoadedProcess()));
:::::::::::::::::
void MainWindow::qmlLoadedProcess()
{
    qDebug()<<"b";
}

//qml side code 
    Rectangle
    {
      signal qmlSignal()
      Component.onCompleted:
      {
         qmlSignal()
         console.log("a")
      }
    }

Answer 1

The problem is that the Component.onCompleted happens before you have called the QObject::connect(…). I.e. the Rectangle in qml is created when you call view->setSource(…) and the Component.onCompleted is called before you connect the signal to the slot. So the qmlLoadedProcess() never gets called.