消息对话框

    //消息对话框
    //1.错误对话框
    QMessageBox::critical(this,"critical","错误");
    //2.信息对话框
    QMessageBox::information(this," info","信息");
    //3.询问对话框 //返回值
    if(QMessageBox::Save  == QMessageBox::question(this," ques","询问",QMessageBox::Save|QMessageBox::Cancel,QMessageBox::Cancel))
    {
        qDebug() << "save";
    }else {
        qDebug() << "cancal";
    }
    //4.警告对话框
     QMessageBox::warning(this," warning","警告");

其他标准对话框

//       颜色对话框
//       QColor color =  QColorDialog::getColor(QColor(255,0,0));
//       qDebug()<< "r = "<<color.red() << "g = "<<color.green() <<  "b = "<<color.blue();

       //文件对话框
//     QFileDialog::getOpenFileName(this,"打开文件","D:\\Qt\\Image");
       //过滤文档
       //有返回值，是它的路径
//       QString str =  QFileDialog::getOpenFileName(this,"打开文件","D:\\Qt\\Image","(*.jpg)");
//       qDebug() << str;

      //字体对话框  返回值
//      bool flag;
//      QFont font = QFontDialog::getFont(&flag, QFont("华文彩云",50));
//      qDebug() <<"字体：" <<font.family().toUtf8().data() << "字体大小：" <<font.pointSize() << "是否加粗：" <<font.bold() << "是否倾斜：" <<font.italic();