摘要：
1、 使用构造函数弹出对话框1.QMessageBoxmsgBox//最简单的对话框不包含QStringstr=“test”；消息框。setText（str）；消息框。exec（）；2、 QMessageBox消息（QMessageBox：：NoIcon，“Title”，“Contentwithincon.”）；//添加了图片的对话框消息
一、使用构造函数弹出对话框
1、 QMessageBox msgBox；//最简单的对话框，里面什么也没有
QString str = “test”；
msgBox.setText(str);
msgBox.exec();
2、
QMessageBox message(QMessageBox::NoIcon, "Title", "Content with icon."); //加入了图片的对话框
message.setIconPixmap(QPixmap("icon.png"));
message.exec();
message.setIconPixmap(QPixmap("icon.png"));
message.exec();
二、使用QMessageBox的静态方法
1、消息对话框,函数原型:StandardButton QMessageBox::information(QWidget *parent, const QString &title, const QString &text, StandardButtons buttons = Ok, StandardButton defaultButton = NoButton)
QMessageBox::information(NULL, "Title", "Content", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);//
2、错误对话框，函数原型:StandardButton QMessageBox::critical(QWidget *parent, const QString &title, const QString &text, StandardButtons buttons = Ok, StandardButton defaultButton = NoButton)
QMessageBox::critical(NULL, "critical", "Content", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);
3、警告对话框，函数原型:StandardButton QMessageBox::warning(QWidget *parent, const QString &title, const QString &text, StandardButtons buttons = Ok, StandardButton defaultButton = NoButton)
QMessageBox::warning(NULL, "warning", "Content", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);
4、问题对话框，函数原型:StandardButton QMessageBox::question(QWidget *parent, const QString &title, const QString &text, StandardButtons buttons = StandardButtons( Yes | No ), StandardButton defaultButton = NoButton)
QMessageBox::question(NULL, "question", "Content", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);
5、关于对话框，函数原型:void QMessageBox::about(QWidget *parent, const QString &title, const QString &text)
QMessageBox::about(NULL, "About", "About this application");
三、如何对二中的返回值做判断
1~4函数都是返回StandardButton，所以：
QMessageBox::StandardButton rb = QMessageBox::question(NULL, "Show Qt", "Do you want to show Qt dialog?", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);
if(rb == QMessageBox::Yes)
QMessageBox::aboutQt(NULL, "About Qt");
if(rb == QMessageBox::Yes)
QMessageBox::aboutQt(NULL, "About Qt");