Hi, it's easy to wrap JSON in too many layers, I think the culprit is this line
....
const QJsonArray array{ value.toArray() };
...
I think that QJSonArray array is a double wrapper, that's why you get size() = 1, because that's the size of the outer array (i.e. the outer array has 1 element, which is one array which has 3 elements :-).

Confirm. See here.
https://doc.qt.io/qt-6/supported-platforms.html

std::unique_ptr<QGrpcCallReply> reply = m_client.UnaryCall(requestMessage);

I would guess you should think about how long this object is alive.

Thanks very much! The other piece I was missing is that CMake uses if/else statements. So, the result is:

if(APPLE) target_compile_options(mytarget PRIVATE -DMAC_ONLY_SYMBOL) else() target_compile_options(mytarget PRIVATE -DOTHER_SYMBOL) endif()

and do fix it you should do:

delegate: MyItem { required property var model mdl: model }

(or rename mdl to model in MyItem.qml)

@andrei_cp
Maybe your resetting the pixmap to a new size in resizeEvent() in turn causes a new size event, and a bit bigger than before? That is the recursion.
In any case I imagine you want to use @friedemannkleint's suggestion, then you only need the label to resize, see if that helps.

@Aman55 So far as I can see you have not tried to show the stack trace from a debugger when it crashes.

Environment

Qt: v6.8.1 (mingw_64)
Windows 11

Minimal Example Problem

When the program is running, toggle "Underline keyboard short cuts and keys" in "Control Panel\Ease of Access\Ease of Access Center\Make the keyboard easier to use". The label doesn't update the underline, until the program is exited and restarted. QMenu can update this without restarting the program. Probably QLabel doesn't have a slot to update display when this system setting changes.
a7032481-d29c-4456-83cc-e09d169cf0a2-image.png

Code

My code is recognized as spam and prohibited from posting here. I'll attach download link.
https://drive.google.com/file/d/18V_E4UvpG2e9h9MDhHR_YLOanw9t_leJ/view?usp=sharing
The key part is

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { lineEdit1 = new QLineEdit; lineEdit2 = new QLineEdit; // bug: QLabel underline for accelerator doesn't update when Alt is pressed in Windows label1 = new QLabel(tr("Field &A:")); label1->setBuddy(lineEdit1); label2 = new QLabel(tr("Field &B:")); label2->setBuddy(lineEdit2); QWidget *centralWidget = new QWidget; setCentralWidget(centralWidget); QGridLayout *mainLayout = new QGridLayout(centralWidget); mainLayout->addWidget(label1, 0, 0); mainLayout->addWidget(lineEdit1, 0, 1); mainLayout->addWidget(label2, 1, 0); mainLayout->addWidget(lineEdit2, 1, 1); menuBar()->addMenu(tr("&Menu")); }

@GrecKo OK, thanks. I did actually want to switch to DelegateChooser so I will try it again. And good to know about its applicability.

Good, in that case, please mark the thread as solved using the topic tools button or the three dotted menu beside the answer you deem correct so that other forum users may know a solution has been found :-)

Hi and welcome to devnet,

I haven't used it but its documentation is here.

It's an extension.

Hi and welcome to the forum,

@Groundbounce said in Complete novice, where do I begin with a HMI project:

I'm looking at using Qt and in the process will learn C++, I currently use C on micro controllers.

make yourself familiar with OOP/C++ first. C and C++ is similar but there might be some traps to fall for.

This would be HMI that displays auto style gauges as the visual output.
[...]
From what I can tell I need to use a Qt quick project.

Yes, for these kind of things QtQuick / QMLanguage is more suitable than a QtWidgets Application.
Edit: [Then your lack of C++ experience doesn't matter too much, since QML is a whole different language (inspired by JavaScript and JSON-style format)]

I am not sure if I should be setting up the graphics in designer or creator.

In general both ways are possible, but QtDesigner (the standalone as well as the QtCreator integrated one) can't do QtQuick.
For more advanced QtQuick Designs there is Qt Design Studio (here), which also features templates for gauge-like elements, animations and more.

@hamer Where is this numbers header included?

At the moment, the suggested code in https://www.kdab.com/single-shot-connections/ seems to work perfectly so far:

auto connection = std::make_unique<QMetaObject::Connection>(); auto connectionPtr = connection.get(); auto singleShot = [receiver, connection = std::move(connection)](parameters) { QObject::disconnect(*connection); receiver->slot(parameters); }; *connectionPtr = connect(sender, &Sender::signal, receiver, std::move(singleShot)));