.
├── CMakeLists.txt
├── Demo.qml
├── Log
│   ├── CatLog_Message.hpp
│   ├── CatLog_Sington.cpp
│   ├── CatLog_Sington.h
│   └── CMakeLists.txt
├── main.cpp
├── main.qml
├── QmlCatLog
│   ├── CMakeLists.txt
│   ├── QmlCatLog.cpp
│   └── QmlCatLog.h
└── README.md

├── Log
│   ├── CatLog_Message.hpp
│   ├── CatLog_Sington.cpp
│   ├── CatLog_Sington.h
│   └── CMakeLists.txt

├── QmlCatLog
│   ├── CMakeLists.txt
│   ├── QmlCatLog.cpp
│   └── QmlCatLog.h

    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QGuiApplication app(argc, argv);

    QMLCATLOG::CatLog *CatLog = QMLCATLOG::CatLog::Instance();

    QQmlApplicationEngine engine;
    //需要将模块注册到qml中，改模块就能在qml所有子控件中使用
    engine.rootContext()->setContextProperty("catlog", CatLog);
    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();

import QtQuick 2.12
import QtQuick.Window 2.12

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    Demo {}
    Component.onCompleted: {
        console.debug("************************");
        var i = 0;
        for(i = 0; i < 100; i++)
            //调用方式需要与定义时的名字一样
            catlog.debug_print("QMLLOG: " + i);
    }
}