QWebEngineView中加载网页并且右键保存图像C++编程

您可以使用QWebEngineView类来加载网页并在右键单击时保存图像。下面是一个用于实现此功能的C++代码示例：

#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QtWebEngineWidgets/QWebEngineView>
#include <QtCore/QUrl>
#include <QtCore/QDebug>
#include <QtGui/QContextMenuEvent>
#include <QtGui/QPixmap>
#include <QtWidgets/QMessageBox>

class MyWebEngineView : public QWebEngineView {
public:
    explicit MyWebEngineView(QWidget* parent = nullptr) : QWebEngineView(parent) {}

protected:
    void contextMenuEvent(QContextMenuEvent* event) override {
        QMenu* menu = page()->createStandardContextMenu();
        QAction* saveImageAction = new QAction(tr("Save Image"), this);
        connect(saveImageAction, &QAction::triggered, this, &MyWebEngineView::handleSaveImageAction);
        menu->addAction(saveImageAction);
        menu->exec(event->globalPos());
        delete saveImageAction;
        delete menu;
    }

private slots:
    void handleSaveImageAction() {
        QUrl imageUrl = page()->contextMenuData().imageUrl();
        if (imageUrl.isEmpty()) {
            QMessageBox::warning(this, tr("Save Image"), tr("No image selected"));
            return;
        }
        QPixmap pixmap;
        if (!pixmap.load(imageUrl.toDisplayString(QUrl::FullyEncoded))) {
            QMessageBox::warning(this, tr("Save Image"), tr("Failed to load image"));
            return;
        }
        QString fileName = QFileDialog::getSaveFileName(this, tr("Save Image"), "", tr("Images (*.png *.xpm *.jpg)"));
        if (fileName.isEmpty()) {
            return;
        }
        if (!pixmap.save(fileName)) {
            QMessageBox::warning(this, tr("Save Image"), tr("Failed to save image"));
            return;
        }
    }
};

int main(int argc, char* argv[]) {
    QApplication app(argc, argv);
    QMainWindow mainWindow;
    MyWebEngineView* webEngineView = new MyWebEngineView(&mainWindow);
    mainWindow.setCentralWidget(webEngineView);
    webEngineView->load(QUrl("https://www.baidu.com/"));
    mainWindow.show();
    return app.exec();
}

在上面的代码中，我们创建了一个名为MyWebEngineView的自定义QWebEngineView类，并覆盖了contextMenuEvent()函数来实现右键菜单。我们添加了一个名为“Save Image”的动作，并将其连接到handleSaveImageAction()槽函数。当用户选择“Save Image”选项时，我们将从contextMenuData()中获取图像的URL，并使用QPixmap加载图像。最后，我们将使用QFileDialog保存图像。

请注意，为了正确使用QWebEngineView，您需要在项目文件中包含QtWebEngineWidgets模块，并将以下行添加到main()函数中：

QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

这是因为QWebEngineView需要启用高分辨率DPI缩放。