svg文件字符串读取到QPushButton上

QString str1=svgString.at(0);

            QXmlStreamReader * xmlString=new QXmlStreamReader(str1);

            QSvgRenderer renderer(xmlString);

             QPixmap image(60, 80);

//                // Get QPainter that paints to the image

             QPainter painter(&image);

             renderer.render(&painter);

             // QIcon * icon=new QIcon(image);

            button->setIcon(QIcon(image));