How to pass complex qml type data to C++

[dalishi]

Hi, I have a QML application to get a navigation route (QML Route), and I would like to pass the resultant route to my C++ processing class once a route is made in QML.

The approach I can think of is once a route is made in QML, I can call a method of the C++ processing class to process it. (following the tutorial exposing method from C++ to QML).

 Q_INVOKABLE bool processRoute(HOW TO PASS PARAM HERE！！) { ...}

The Route QML Type has property:

segments : list<RouteSegment>

for each RouteSegment type has property：

path : list<coordinate>

So it's basically a nested QML list. My question is how to design the parameters type of the C++ method processRoute(...) to be called in QML and pass the Route type? or How to convert the QML Route to a C++-defined type like QVector<QPointF> .