Send text from Qt to QML

[JoeCFD]

@Damian7546 "emit userNameChanged();" will update it.

[Damian7546]

@JoeCFD I do that from beginning.

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?

[JoeCFD]

@Damian7546 did you define the signal userNameChanged() in NetworkSystemController?

[Damian7546]

@JoeCFD Exactly:

signals:
    void userNameChanged();

[JoeCFD]

@JoeCFD add this in front of your Text to see what happens.

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

[Damian7546]

@JoeCFD nothing....without logs after emit userNameChanged();

      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 ?

[Damian7546]

I'm still struggling with mine problem, now I try called two functions like below:

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?

[JoeCFD]

@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);
}

[Damian7546]

@JoeCFD said in Send text from Qt to 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 ...

[JoeCFD]

@Damian7546 qDebug()<<"!!!here we are !!!"; shows up in companyDetails() call?

[Damian7546]

@JoeCFD
Yes, probably I found problem. QML create own object , and I created second object in Qt, so I worked from two different objects.

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 ?