How set organization name and application values?

[realroot2185]

use cxx_qt_lib::{QGuiApplication, QQmlApplicationEngine, QUrl};

mod cxxqt_object;

fn main() {
    // Create the application and engine
    let mut app = QGuiApplication::new();
    let mut engine = QQmlApplicationEngine::new();

    app.set_application_version("0.1,0");
    app.set_organization_name("org");
    app.set_organization_domain("domain");

    // Load the QML path into the engine
    if let Some(engine) = engine.as_mut() {
        engine.load(&QUrl::from("qml/main.qml"));
    }

    // Start the app
    if let Some(app) = app.as_mut() {
        app.exec();
    }
}

I see errors like no method named 'set_application_version' found for ... help: there is a method with a similar name: 'application_version'.

How do I set those values if instance of QGuiApplication can only read them?

[ahayzen-kdab]

So set_application_version is implemented on the type Pin<&mut QGuiApplication> the same as exec. But QGuiApplication::new returns a UniquePtr<QGuiApplication> so you need to have a pinned mutable reference to the QGuiApplication to use those methods. As seen in other parts of your code this is achieved by using if let Some(app) = app.as_mut() { ... }, so something similar to the following should work.

if let Some(app) = app.as_mut() {
    app.set_application_version(&QString::from("0.1.0"));
    app.organization_name(&QString::from("org"));
    app.organization_domain(&QString::from("domain"));
}

[realroot2185]

I forgot set for the last two now edited.

error[E0382]: use of moved value: `app`
  --> src/main.rs:18:6
   |
16 |     if let Some(app) = app.as_mut() {
   |                 --- move occurs because `app` has type `Pin<&mut QGuiApplication>`, which does not implement the `Copy` trait
17 |         app.set_application_version(&QString::from("0.1.0"));
   |         --- value moved here
18 |         app.set_organization_name(&QString::from("org"));
   |         ^^^ value used here after move
[...]

I can use app only once.

[ahayzen-kdab]

Ah yes you'll hit the move fun, add some as_mut()'s in there and it'll work.

    if let Some(mut app) = app.as_mut() {
        app.as_mut().set_application_version(&QString::from("0.1.0"));
        app.as_mut().set_organization_name(&QString::from("org"));
        app.as_mut().set_organization_domain(&QString::from("domain"));
    }

[realroot2185]

That compiles fine but I see this when I run the app:

/qml/main.qml:35:5: QML Settings: Failed to initialize QSettings instance. Status code is: 1
/qml/main.qml:35:5: QML Settings: The following application identifiers have not been set: QList("organizationName", "organizationDomain")

[ahayzen-kdab]

We may need to see a full example to debug what is happening if possible ?

[realroot2185]

main.qml

...
import Qt.labs.settings

ApplicationWindow {
    Settings {
        category: "General"
        property alias x: root.x
        property alias y: root.y
        property alias someBool: someBool
        property alias someInt: someInt
        ...
    }

main.rs

use cxx_qt_lib::{QGuiApplication, QQmlApplicationEngine, QString, QUrl};

mod cxxqt_object;

fn main() {
    // Create the application and engine
    let mut app = QGuiApplication::new();
    let mut engine = QQmlApplicationEngine::new();
    
    // Load the QML path into the engine
    if let Some(engine) = engine.as_mut() {
        engine.load(&QUrl::from("qml/main.qml"));
    }

    // Set app fields and start it
    if let Some(mut app) = app.as_mut() {
        app.as_mut().set_application_version(&QString::from("0.1.0"));
    	app.as_mut().set_organization_name(&QString::from("org"));
    	app.as_mut().set_organization_domain(&QString::from("dom"));
        app.exec();
    }
}

Is that enough? I can share full code otherwise.

[ahayzen-kdab]

You likely need to set the organisation etc before loading the QML file to the engine. So try moving the setters earlier in the code. If that doesn't work i'll try to reproduce.