C++中调用QML函数_c++调用qml函数-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_50679120/article/details/137789132

博客介绍了在.qml文件中编写函数，然后在main.cpp文件里进行调用的相关内容，涉及前端开发与C++编程的结合。

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在.qml中写一个函数

import QtQuick
import QtQuick.Controls
import MyObj 1.0

Window {
    id: window
    objectName: "window"
    width: 480
    height: 480
    visible: true
    title: qsTr("Hello World")

    //目标函数
    function qmlFunc(i, s) {
        return "success"
    }


    Button {
        id: btn
        objectName: "button"

        onClicked: {
            MyObject.func()
        }
    }
}

在main.cpp中调用

#include"myobject.h"

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include <QScreen>
#include <QObject>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    qmlRegisterSingletonInstance<MyObject>("MyObj", 1, 0, "MyObject", MyObject::getInstance());

    QObject::connect(
        &engine,
        &QQmlApplicationEngine::objectCreationFailed,
        &app,
        []() { QCoreApplication::exit(-1); },
        Qt::QueuedConnection);
    engine.loadFromModule("updatePublisher", "Main");

    //获取部件
    auto list = engine.rootObjects();
    auto window = list.first();

    //调用函数
    QVariant res;
    QVariant arg_1 = 123;
    QVariant arg_2 = "Zhang San";
    QMetaObject::invokeMethod(window, "qmlFunc", Q_RETURN_ARG(QVariant, res), Q_ARG(QVariant, arg_1), Q_ARG(QVariant, arg_2));
    qDebug() << res;


    return app.exec();
}