将QwebView转成图片打印及保存

[code]    QPrinter m_printer;
    QString printerName = m_printer.printerName();
    if( printerName.size() == 0){
        ChMessageOnlyOk_Information("找不到打印机！");
        return;
    }
    //直接打网页
//    m_printWebView->print(&m_printer);
    //把web网页转成painter图片打印
    {
        QPainter painter(&m_printer);
        m_printWebView->page()->mainFrame()->render(&painter);
        painter.end();
    }
    //这里也可以把web网页转成painter变成一张图片保存下来
    {
        QImage *img = new QImage(500,500,QImage::Format_RGB32);
        QPainter painter(img);
        m_printWebView->page()->mainFrame()->render(&painter);
        painter.end();
        img->save("D:/img.jpg");
    }

    m_printer.setPageSize(QPagedPaintDevice::Custom);
    m_printer.setPageSizeMM(QSize(10.1, 8.2));