Qt入门 - QMessageBox

1 QMessageBox ( QWidget * parent = 0 )
2 QMessageBox ( Icon icon, const QString & title, const QString & text, StandardButtons buttons = NoButton, QWidget * parent = 0, Qt::WindowFlags f = Qt::Dialog | Qt::MSWindowsFixedSizeDialogHint )

1 void    about ( QWidget * parent, const QString & title, const QString & text )
2 void    aboutQt ( QWidget * parent, const QString & title = QString() )
3 StandardButton    critical ( QWidget * parent, const QString & title, const QString & text, StandardButtons buttons = Ok, StandardButton defaultButton = NoButton )
4 StandardButton    information ( QWidget * parent, const QString & title, const QString & text, StandardButtons buttons = Ok, StandardButton defaultButton = NoButton )
5 StandardButton    question ( QWidget * parent, const QString & title, const QString & text, StandardButtons buttons = Ok, StandardButton defaultButton = NoButton )
6 StandardButton    warning ( QWidget * parent, const QString & title, const QString & text, StandardButtons buttons = Ok, StandardButton defaultButton = NoButton )

1 QMessageBox::information(NULL, "Title", "Content", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);

1 QMessageBox::about(NULL, "About", "About this <font color=‘red‘>application</font>");

QMessageBox msgBox;
msgBox.setWindowTitle("MsgBox");
msgBox.setText("The document has been modified.");
msgBox.setInformativeText("Do you want to save your changes?");
msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
msgBox.setDefaultButton(QMessageBox::Save);
int ret = msgBox.exec();

switch (ret)
{
    case QMessageBox::Save:
       // Save was clicked
       break;
    case QMessageBox::Discard:
       // Don‘t Save was clicked
       break;
    case QMessageBox::Cancel:
       // Cancel was clicked
       break;
    default:
       // should never be reached
       break;
}