Unsolved Cannot execute examples from Doc
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Hello,
I'm trying to learn about connections between QML and C++ and I don't understand why I cannot get the examples from doc working.
For example, I try to use this simple example.
So my full main.cpp code is:
#include <QGuiApplication> #include <QQmlApplicationEngine> #include <QQuickView> class MyClass : public QObject { Q_OBJECT public slots: void cppSlot(const QString &msg) { qDebug() << "Called the C++ slot with message:" << msg; } }; int main(int argc, char *argv[]) { QGuiApplication app(argc, argv); QQuickView view(QUrl::fromLocalFile("MyItem.qml")); QObject *item = view.rootObject(); MyClass myClass; QObject::connect(item, SIGNAL(qmlSignal(QString)), &myClass, SLOT(cppSlot(QString))); view.show(); return app.exec(); }
And when I try to build it, I get the following errors:
main.cpp:18: error: cannot initialize a variable of type 'QObject *' with an rvalue of type 'QQuickItem *' main.cpp:-1: In function 'int qMain(int, char**)': main.cpp:18: error: cannot convert 'QQuickItem*' to 'QObject*' in initialization QObject *item = view.rootObject(); ^ D:\Qt\5.12.6\mingw73_64\include\QtQuick\qquickview.h:43: In file included from D:\Qt\5.12.6\mingw73_64\include\QtQuick/qquickview.h:43:0, D:\Qt\5.12.6\mingw73_64\include\QtQuick\QQuickView:1: from D:\Qt\5.12.6\mingw73_64\include\QtQuick/QQuickView:1, main.cpp:3: from ..\test2\main.cpp:3: D:\Qt\5.12.6\mingw73_64\include\QtQuick\qquickwindow.h:55: class type 'QQuickItem' is incomplete class QQuickItem; ^~~~~~~~~~
How to solve it and why is it so complex to use examples?
Regards
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@LeLev That fixes it, thank you.
The creator should set this thread as resolved....