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POQML callback from C++ with custom type as parameter
 

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    <p>I would like to be able to call a QML function from C++ with an instance of a custom class as a parameter and then manipulate the instance from QML.</p> <p>Here is what I did so far :</p> <p>Data.h</p> <pre><code>class Data : public QObject { Q_OBJECT Q_PROPERTY(QString text READ text WRITE setText) public : Data() : QObject(), _text("Foo") { } virtual ~Data() { } Data(const Data &amp; other) { _text = other._text; } QString text() const { return _text; } void setText(const QString &amp; text) { _text = text; } private : QString _text; }; Q_DECLARE_METATYPE(Data); </code></pre> <p>Main.cpp</p> <pre><code>#include "Data.h" int main(int argc, char *argv[]) { QApplication app(argc, argv); Data callBackData; QQmlEngine engine; QQmlComponent rootComponent(&amp;engine, QUrl::fromLocalFile("CallBack.qml")); QObject * rootObj = rootComponent.create(); QMetaObject::invokeMethod(rootObj, "callMeBack", Q_ARG(QVariant, QVariant::fromValue(callBackData))); return app.exec(); } </code></pre> <p>CallBack.qml</p> <pre><code>import QtQuick 2.0 Item { function callMeBack(data) { console.log(data.text) } } </code></pre> <p>The console outputs <code>"Undefined"</code>. Did I do something wrong ?</p> <p>When changing the function body to <code>console.log(data)</code> it outputs <code>"QVariant(Data)"</code> so why can't I access the text property of data ?</p> <p>I tried registering <code>Data</code> as a QML type using <code>qmlRegisterType&lt;Data&gt;();</code> but this does not change anything.</p>
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