Export watcher:
int main(int argc, char *argv[])
{
QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
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);
QFileSystemWatcher watcher;
watcher.addPath("data.json");
readJSON myGlobal;
engine.rootContext()->setContextProperty("myGlobalObject", &myGlobal);
engine.rootContext()->setContextProperty("watcher", &watcher);
engine.load(url);
return app.exec();
}
and use Connections:
Window {
visible: true
width: 800
height: 800
title: qsTr("Screen Display")
DisplaysForm {
function callCPP(text) {
var dataOne = myGlobalObject.readingJson(text)
dataOne = parseFloat(dataOne)
return dataOne
}
function updateDisplay() {
var value = callCPP("Engine_Spd")
engSpd_txt.text = value
var value1 = callCPP("Engine_Power")
engPwr_txt.text = value1
}
Connections{
target: watcher
function onFileChanged(path){
console.log(path)
updateDisplay()
}
}
}
