emit Qserialport.readyread in qml

Phong

Hi all,

I used to use qserialport in c++, and the easy way to read the data from serial is connected readyread with
my custom read slot function.

Recently, I tried to use qml for ui design, this is the reference I used : qcsvlog
In his source code, he use timer to monitor and read the data per time, it works ok.

But, I really wonder is there a way to use readyread in qml??
and I found I CAN'T create a c++ signal and used it in qml....
Lots of tutorials are talking about qml signal --> cpp Slot, but the opposite one.

J.Hilk

@Phong there are Examples in both ways, even in the official docu.

Here's a broken down example of my own:

/*Cpp.Source File*/
// connect our C++ signal to our QML slot
// NOTE: if we want to pass an parameter to our QML slot, it has to be a QVariant.
    QObject::connect(this, SIGNAL(setText(QVariant)),
                         qmlObject, SLOT(setText(QVariant)));

/*QML-File*/
// this function is our QML slot
    function setText(text){
        console.log(text)
    }

//Now call your QML SLot by emiting the signal
...
emit setText("Hello From C++");
...

Phong

Hi @J-Hilk

Thanks for ur answer, your answer is correct.

I have to apologized I didn't write my question clearly,
I actually want to access C++ signal in qml and act the C++ Slot or qml Slot
That is, do everything in qml.

I finally found the solution on Qt Forum,
I can write a signal in my C++ class

signal : 
    void readyRead_();

and call the signal in qml by adding "on" as prefix:

MySerialPort {
        onReadyRead_(){
        //do sometihing
    }
}

Anyway, Thanks a lot!