[HELP] : access QML object on c++

jhayar

Hi, would like to ask how can i access QML object from within the c++?

for example

this is my main.qml
import QtQuick
import "global/views/" as Component
Window {
id: mainWindow
width: 480
height: 800
visible: true
title: qsTr("Movie Stream")

Component.BorderedTextView{
    borderColor: "#000000"
    id: me
    textHint: "sample"
    radius:  5
    width: 200
    height: 50

}

}

and the BorderedTextView.qml
import QtQuick 2.15

Item{
property double radius:0
property string textHint: ""
property color borderColor: "#e8e8e8"
property color hintColor : "#888888"
property color textColor: "#000000"
property double fontSize: 12
property double borderWidth: 1
property string text:""

id: myItem
Rectangle{

    width: myItem.width
    height: myItem.height
    border.color: myItem.borderColor
    border.width:  myItem.borderWidth
    radius: myItem.radius
    clip : true
    TextEdit{
        id:textEdit
        text:myItem.text
        color:  myItem.textColor
        width: myItem.width
        height: myItem.height
        textMargin: 2
        font.pointSize: myItem.fontSize
        Text{
            visible: !textEdit.text
            text: myItem.textHint
            color: myItem.hintColor
            font.pointSize: myItem.fontSize
        }
    }
}

}

and this is my main.cpp
#include <QGuiApplication>
#include <QQmlApplicationEngine>

#include <QFileInfo>
#include <QLocale>
#include <QTranslator>
#include <Qt>
#include <iostream>
#include <QDebug>
#include <QQmlContext>
#include <QWindow>
#include <QScreen>

int main(int argc, char *argv[])
{

QGuiApplication app(argc, argv);
std::string platform = app.platformName().toStdString();

QTranslator translator;
const QStringList uiLanguages = QLocale::system().uiLanguages();
for (const QString &locale : uiLanguages) {
    const QString baseName = "MovieStream_" + QLocale(locale).name();
    if (translator.load(":/i18n/" + baseName)) {
        app.installTranslator(&translator);
        break;
    }
}

QQmlApplicationEngine engine;
const QUrl url(u"qrc:/MovieStream/main.qml"_qs);
QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                 &app, [url](QObject *obj, const QUrl &objUrl) {
    if (!obj && url == objUrl)
        QCoreApplication::exit(-1);
}, Qt::QueuedConnection);
engine.load(url);

qDebug() <<app.allWindows()[0]->findChild<QObject*>("me");
return app.exec();

}

but it always return null or QObject(0x0)

i also try to use engine.rootObjects()[0]->findChild<QObject*>("me"); and engine.rootContext.findChild<QObject*>("me"); but it gives me the same return

how can i achieve that.

thanks

sierdzio

First of all, findChild() will scan for objectName: "me", not for id: me.

Second, you should probably search through children of the engine.

Third: read the docs :-) https://doc.qt.io/qt-6/qtqml-cppintegration-interactqmlfromcpp.html and https://doc.qt.io/qt-6/qtqml-cppintegration-overview.html

GrecKo

Fourth: Don't

jhayar

@sierdzio said in [HELP] : access QML object on c++:

First of all, findChild() will scan for objectName: "me", not for id: me.

Second, you should probably search through children of the engine.

Third: read the docs :-) https://doc.qt.io/qt-6/qtqml-cppintegration-interactqmlfromcpp.html and https://doc.qt.io/qt-6/qtqml-cppintegration-overview.html

hi , thanks , got it working :) i thought that findChild is looking for id

will mark this as solved thanks :)

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[HELP] : access QML object on c++