I explain you .
I have two class :
NetworkSystemController
NetworkProcessor
The first class is to "data container" for QML visualisation, and them object is created by register this class in QML and import to QML.

NetworkSystemController {
        id: networkSystemController
    }

From my second class (NetworkProcessor) I would like to send userDetails variable , so I created object:

NetworkSystemController * networkSystemController = new NetworkSystemController;
connect(this, &NetworkProcessor::userDetails, networkSystemController,  &NetworkSystemController::userDetails);

and slot in NetworkSystemController

void NetworkSystemController::userDetails(QString userName)
{
    setUserName(userName);
}

and setUserName metod :

void NetworkSystemController::setUserName(const QString &newUserName)
{
    if (m_userName == newUserName)
        return;
    m_userName = newUserName;
    emit userNameChanged();
     qDebug()<<"!!!here we are !!!";
}

is always called, but emit signal not emitted to object created by QML, am I right ? I would be really gratefull if someone give me a tips how to realize my concept without creating NetworkSystemController object outsied QML ?

@Damian7546 said in Send text from Qt to QML:

void NetworkSystemController::companyDetails(QString userNamein)
{
setUserName(userNamein);
}

change it here. You see the mismatch: QString userNamein and const QString &newUserName
void NetworkSystemController::companyDetails( const QString & userNamein)
{
setUserName(userNamein);
}

It isn't problem. I tested function like:

void NetworkSystemController::testFun(QString name)
{
    setUserName(QString);
}

and works. but my still doesn't work :/

void NetworkSystemController::companyDetails(QString userNamein)
{
    setUserName(userNamein);
}

This two functions are only different call. First(good working) is called by button from visualisation, but companyDetails by emit signal from other object. ... And both functions are performed, but only first function emit signal works properly with qml ...

void NetworkSystemController::companyDetails(QString userNamein)
{
setUserName(userNamein);
}

change it here. You see the mismatch: QString userNamein and const QString &newUserName
void NetworkSystemController::companyDetails( const QString & userNamein)
{
setUserName(userNamein);
}

void NetworkSystemController::companyDetails(QString userNamein)
{
    setUserName(userNamein);
}
void NetworkSystemController::testFun()
{
    setUserName("testowyName");
}

and setUserName definition:

void NetworkSystemController::setUserName(const QString &newUserName)
{
    if (m_userName == newUserName)
        return;
    m_userName = newUserName;
    emit userNameChanged();
     qDebug()<<"!!!here we are !!!";
}

In both calling I get message "!!!here we are !!!" in console, but in QML signal works only by testFun() but doesn't work when called companyDetails(QString userNamein)

Any idea?

      Connections {
            target: networkSystemController
            function onUserNameChanged() {
                console.log("===========")
            }
        }
        Text {

            text: networkSystemController.userName
            anchors.horizontalCenter: rectContuserName.horizontalCenter
            anchors.verticalCenter: rectContuserName.verticalCenter
            font.pixelSize: rectContuserName.width * .15
            color: "white"
        }

What more can I check ?

Connections { 
        target: networkSystemController
        function onUserNameChanged() {
              console.log( "===========")
        }
}

signals:
    void userNameChanged();

void NetworkSystemController::setUserName(const QString &newUserName)
{
    if (m_userName == newUserName)
        return;
    m_userName = newUserName;
    emit userNameChanged();
     qDebug()<<"!!!here we are !!!";
}

And in console I got message "!!!here we are !!!", and nothing in QML , so?

Currently result :

and before update it look like this:

I try rewrite my new Q_PROPERTY like old construction but still my NetworSystemController can't send QString to QML page. :/

Any idea?

Text {
            text: "Text test" ///networkSystemController.userName
            anchors.horizontalCenter: rectContuserName.horizontalCenter
            anchors.verticalCenter: rectContuserName.verticalCenter
            font.pixelSize: rectContuserName.width * .15
            color: "white"
        }

  Text {
            text: networkSystemController.userName
            anchors.horizontalCenter: rectContuserTest.horizontalCenter
            anchors.verticalCenter: rectContuserTest.verticalCenter
            font.pixelSize: rectContuserTest.width * .15
            color: "white"
        }