Hello
I’m new to the forum and pretty new to QT5 development with QML as well.
I’ve got an application using some C++ objects and QML for the GUI.
I’m tryng to store values in a .conf file using QSettings.
I am creating a settings object my main object:
application.h:
#include <QSettings>
class RS232VisualizerMain : public QObject
{
Q_OBJECT
private:
SerialConnect* serialPort;
QSettings* appSettings;
}
application.cpp:
RS232VisualizerMain::RS232VisualizerMain(QObject *parent) :
QObject(parent)
{
appSettings = new QSettings;
appSettings->setValue("main/test","test");
}
I can save values from my C-class using the code above.
However, I couldn’t figure out how to write settings from the QML code. I’m trying to set the object as a context property and writing to it from qml:
application.cpp:
engine = new QQmlEngine;
//export context properties to qml
engine->rootContext()->setContextProperty("appSettings",appSettings);
component = new QQmlComponent(engine);
component->loadUrl(QUrl("qrc:/qml/main.qml"));
if ( !component->isReady() ) {
qWarning("%s", qPrintable(component->errorString()));
return 1;
}
topLevel = component->create();
window = qobject_cast<QQuickWindow *>(topLevel);
if ( !window ) {
qWarning("Error: Your root item has to be a Window.");
return 1;
}
window->show();
main.qml:
Component.onCompleted: {
appSettings.setValue("serialPort/BAUD", "9600")
}
With the setValue statement in QML like this, the application crashes on startup with exit code 0
I’m certainly missing something obvious. Any hint to tutorials, documentation or existing forum threads is appreciated.
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