C++ Qt:无法从javascript调用共享对象方法/属性

对于这个问题，我尝试了与Vicky Chijwani完全相同的答案 一切都很好，但我无法调用jshelper的任何方法或属性

请看一下我的代码 myclass.h

class MyClass : public QObject
{
    Q_OBJECT
public:
    MyClass(QObject *parent = 0);
    void print();

    int num;

signals:

public slots:
};

class MyWebEngineView : public QWebEngineView
{
public:
    MyWebEngineView(QWidget *parent);

    MyClass helper;
};

myclass.cpp

MyClass::MyClass(QObject *parent) : QObject(parent)
{
 num=100;
}

void MyClass::print()
{
    QMessageBox bx;
    bx.exec();
}

MyWebEngineView::MyWebEngineView(QWidget *parent): QWebEngineView(parent)
{
    QWebChannel *channel = new QWebChannel(page());
    channel->registerObject(QStringLiteral("jshelper"), &helper);load(QUrl::fromLocalFile(QFileInfo("../html/index.html").absoluteFilePath()));
    page()->setWebChannel(channel);
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    view = new MyWebEngineView(this);
    view->setGeometry(10, 10, 500, 500);
    view->load(QUrl::fromLocalFile(QFileInfo("../html/index.html").absoluteFilePath()));
}

mywebengineview.h

class MyClass : public QObject
{
    Q_OBJECT
public:
    MyClass(QObject *parent = 0);
    void print();

    int num;

signals:

public slots:
};

class MyWebEngineView : public QWebEngineView
{
public:
    MyWebEngineView(QWidget *parent);

    MyClass helper;
};

mywebengineview.cpp

MyClass::MyClass(QObject *parent) : QObject(parent)
{
 num=100;
}

void MyClass::print()
{
    QMessageBox bx;
    bx.exec();
}

MyWebEngineView::MyWebEngineView(QWidget *parent): QWebEngineView(parent)
{
    QWebChannel *channel = new QWebChannel(page());
    channel->registerObject(QStringLiteral("jshelper"), &helper);load(QUrl::fromLocalFile(QFileInfo("../html/index.html").absoluteFilePath()));
    page()->setWebChannel(channel);
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    view = new MyWebEngineView(this);
    view->setGeometry(10, 10, 500, 500);
    view->load(QUrl::fromLocalFile(QFileInfo("../html/index.html").absoluteFilePath()));
}

main window.cpp

MyClass::MyClass(QObject *parent) : QObject(parent)
{
 num=100;
}

void MyClass::print()
{
    QMessageBox bx;
    bx.exec();
}

MyWebEngineView::MyWebEngineView(QWidget *parent): QWebEngineView(parent)
{
    QWebChannel *channel = new QWebChannel(page());
    channel->registerObject(QStringLiteral("jshelper"), &helper);load(QUrl::fromLocalFile(QFileInfo("../html/index.html").absoluteFilePath()));
    page()->setWebChannel(channel);
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    view = new MyWebEngineView(this);
    view->setGeometry(10, 10, 500, 500);
    view->load(QUrl::fromLocalFile(QFileInfo("../html/index.html").absoluteFilePath()));
}

最后是javascript

<script type="text/javascript">
        var jshelper;
        document.addEventListener("DOMContentLoaded", function () {
            new QWebChannel(qt.webChannelTransport, function(channel) {
                alert('ok');
                // all published objects are available in channel.objects under
                // the identifier set in their attached WebChannel.id property

                jshelper = channel.objects.jshelper;
                alert( jshelper.num );
                jshelper.print();

            });
        });

        </script>

---

我的代码有什么问题，我试图在4天左右修复这个问题，但我无法修复它

我知道在QWebKit下，我必须使成员函数如下所示：

public slots:
    Q_INVOKABLE void print();

---

我知道在QWebKit下，我必须使成员函数如下所示：

public slots:
    Q_INVOKABLE void print();

---

我知道我很晚才提供注释，但是如果有问题的函数是在slots部分声明的，那么您不必使用Q_INVOKABLE。如果有多个函数，则键入的内容会稍微减少

class MyClass : public QObject
{
    Q_OBJECT
public:
    MyClass(QObject *parent = 0);

slots:
    void print();
}

---

我知道我很晚才提供注释，但是如果有问题的函数是在slots部分声明的，那么您不必使用Q_INVOKABLE。如果有多个函数，则键入的内容会稍微减少

class MyClass : public QObject
{
    Q_OBJECT
public:
    MyClass(QObject *parent = 0);

slots:
    void print();
}

---

console.log（channel.objects.jshelper）

，或

console.log（channel.objects）

说什么？jshelper:_uid:_u:“jshelper”objectSignals:objectpropertycache\u uu:ObjectdeleteLater:function（）{销毁：Objectconnect:function（callback）{断开：function（callback）{proto:ObjectobjectName:（…）get objectName:function（）{set objectName:function（value）{objectNameChanged:ObjectpropertyUpdate:function（signals，propertyMap）SignalEmissed:function（signalName，signalArgs）unwrapProperties:function（）unwrapQObject:function（response）__proto\uuuu:QObjectSo no

num

或

print

功能清晰。是的，我缺少了什么..？我无法弄清楚。console.log（channel.objects.jshelper）或

console.log（channel.objects）

说什么？jshelper:\uuuu id\uuuu：“jshelper”objectSignals:Object\uu属性缓存：ObjectdeleteLater:function（）{销毁：Objectconnect:function（callback）{断开连接：function（callback）{proto:ObjectobjectName:（…）get objectName:function（）{设置objectName:function（value）{objectName更改：ObjectpropertyUpdate:function（signals，propertyMap）signalEmissed:function（signalName，signalArgs）unwrapProperties:function（）unwrapQObject:function（回答）uuu proto_uuuuu:QObjectSo no

num

或

print

功能清晰。是的，我遗漏了什么？我想不出来。谢谢你。qtwebengine也需要Q_可调用。我从未尝试过这个。：（现在它工作了。谢谢你。qtwebengine也需要Q_可调用。我从未尝试过这个。）。