QT QMessageBox添加中文按钮

        QMessageBox box(QMessageBox::Question,QString::fromLocal8Bit("提示"),QString::fromLocal8Bit("是否确定退出？"));
QPushButton *okButton = (box.addButton(QString::fromLocal8Bit("确定"),QMessageBox::AcceptRole));
QPushButton *cancelButton = (box.addButton(QString::fromLocal8Bit("取消"), QMessageBox::RejectRole));
box.exec();
if( box.clickedButton() == okButton )

{

             //点击确定按钮后需要进行的操作

         }