@Mesrine
The problem is related to Permissions.
I was thinking that the camera start() function would do that but no.

So I have reimplemented the qml type adding a function to ask for permission like:

void QRImageDecoder::requestPermision() { #if QT_CONFIG(permissions) QCameraPermission cPermission; switch (qApp->checkPermission(cPermission)) { case Qt::PermissionStatus::Undetermined: qApp->requestPermission(cPermission, this, &QRImageDecoder::requestPermision); return; case Qt::PermissionStatus::Denied: emit permissionRequested(false); return; case Qt::PermissionStatus::Granted: emit permissionRequested(true); return; } #endif }

then
the qml element

import QtQuick 2.0 import QtMultimedia import QtQrDec import MyDesigns Item { id:root signal gotdata(string data); function stop() { timer.stop(); camera.stop(); startcamera.visible=true; } VideoOutput { id: videoOutput anchors.fill: root } MediaDevices { id: devices } Camera { id: camera active: false cameraDevice: devices.defaultVideoInput onErrorOccurred: (error,errorString)=> { console.log( devices.videoInputs); console.log(errorString) console.log(error) } } Connections { target: QRImageDecoder function onText_changed(boo) { root.gotdata(QRImageDecoder.text) } } Connections { target: QRImageDecoder function onPermissionRequested(boo) { if(boo) { camera.start(); timer.start(); startcamera.visible=false; } } } CaptureSession { id: capturesession camera: camera videoOutput: videoOutput imageCapture: ImageCapture { id: imageCapture onImageCaptured: { QRImageDecoder.source = imageCapture.preview } } } Timer { id: timer interval: 500; running: false; repeat: true onTriggered: imageCapture.capture() } MyButton { id:startcamera anchors.centerIn: root text:qsTr("ScanQr") onClicked: { QRImageDecoder.requestPermision(); } width:100 height:width*0.5 } }

@jsulm I create very simple qt quick project and try to launch with eglfs
but I dont have any error in terminal while this is nothing to show
// main.qml

import QtQuick 2.15 import QtQuick.Window 2.15 Window { width: 1920 height: 1080 visible: true title: qsTr("Hello World") Timer { running: true repeat: true interval: 1000 onTriggered: rec.rotation += 10 } Rectangle { anchors.centerIn: parent width: 300; height: 330 color: 'salmon' id: rec } }

// main.cpp

int main(int argc, char *argv[]) { QGuiApplication app(argc, argv); QQmlApplicationEngine engine; const QUrl url(QStringLiteral("qrc:/main.qml")); QObject::connect(&engine, &QQmlApplicationEngine::objectCreated, &app, [url](QObject *obj, const QUrl &objUrl) { if (!obj && url == objUrl) QCoreApplication::exit(-1); }, Qt::QueuedConnection); engine.load(url); return app.exec();

Hi and welcome to devnet,

Is your dialog shown using exec ? If so, change the logic to use the open method. That way you will have only one event loop running to handle all your events.

@JonB thanks for your reply I got my output but with some minor issues if i can't. I'll ask for your help again.

@Mesrine

My application now works. The issue is related to using pointers of QObject as static members of a QML custom type. These objects were the ones opening the sockets.

Hi and welcome to devnet,

What kind of application did you run ?

For target without GPUs there's the Qt Quick 2D Renderer.

@Thananjeyan
You do realise that you do a standalone scanner.readAll() in on_pushButton_5_clicked(), right? You're not expecting that to output the data from a previous readBarcodeData(), are you?

@jsulm That page makes no mention of android assets.

@SeDi Click SDK Manager button to install Platform SDK.

Hello monettes can you please share the b2qt image , I'm trying for so long to build one but it is always failing bacause of the qtwebengine.

Thanks in advance

I successfully fixed the issue after upgrading to OPenssl 3...Thanks you @SGaist for the help

@drebelpai the reason is that 6.5 will only enter the LTS phase after 6.5.3 is
out.

That is, for the first patch level releases, any LTS release is just a normal release, with both open source and commercial sources being available. But after Qt 6.6.0 is released, Qt 6.5 normally wouldn't get any scheduled updates anymore. This is where the commercial-only LTS releases come into play.

You also notice that in the screenshot: There's a lts-6.2.5 branch, but no lts-6.2.4 branch. This is because Qt 6.2.4 was still a non-lts patch level release (see also https://wiki.qt.io/Qt_6.2_Release).

Anyhow, I agree that the terminology here is confusing.