对于这个问题QT QWebEnginePage::setWebChannel() 传输对象,我已经尝试与 Vicky Chijwani 的答案完全相同 ,一切都很好,但我无法调用 jshelper 的任何方法或属性。
请看我的代码 myclass.h
class MyClass : public QObject
{
Q_OBJECT
public:
MyClass(QObject *parent = 0);
void print();
int num;
signals:
public slots:
};
我的类.cpp
MyClass::MyClass(QObject *parent) : QObject(parent)
{
num=100;
}
void MyClass::print()
{
QMessageBox bx;
bx.exec();
}
mywebengineview.h
class MyWebEngineView : public QWebEngineView
{
public:
MyWebEngineView(QWidget *parent);
MyClass helper;
};
mywebengineview.cpp
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);
}
主窗口.cpp
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>
问题是这两行永远不会正确执行
alert( jshelper.num ); // gives 'undefined' message
jshelper.print(); //will not work
我的代码有什么问题,我试图在 4 天左右解决这个问题,但我无法修复它。