[提问]QMessageBox问题 [复制链接]

void MainWindow::do_file_SaveOrNot()
{
    if(ui->textEdit->document()->isModified())
    QMessageBox box;
    box.setWindowTitle(tr("Alarm"));
    box.setIcon(QMessageBox::Warning);
    box.setText(curFile+tr("is not be saved,would you want to save it?"));
    box.setStandardButtons(QMessageBox::Yes|QMessageBox::No);
    if(box.exec()==QMessageBox::Yes)
    {
    do_file_Save();
    }
运行提示‘box’was not declared in this

scope.我是菜鸟，求高手相助.

}

#include <QMessageBox >

谢谢已解决，开始直接在main.cpp添加没效果，在头文件添加就好了！