QMessageBox 的完整用法

QMessageBox:: StandardButton btn_ret= QMessageBox::information(NULL, "Tips", "Message",QMessageBox::Yes|QMessageBox::No);
switch (btn_ret)
{
case QMessageBox::Yes:
    qDebug()<<"Yes";
    break;
case QMessageBox::No:
    qDebug()<<"NO";
    break;
default:
    break;
}