QML: Using cpp signal in QML always results in “Cannot assign to non-existent property”

Question

I just want to connect a cpp signal to a qml slot and tried different ways, but it always results in the same QML-Error at runtime: Cannot assign to non-existent propert

Answer 1

For exposing signals from C++ Object you must follow some naming conventions:

• Signal must begin by a lowercase letter in your C++ code, i.e void yourLongSignal()
• Signal handler in QML will be named on<YourLongSignal>

So, the only thing you have to edit in your code is to change

signals:
    void processed(const QString& str);