＜QT＞QDialog--＞QMessageBox

//消息对话框为模态对话框

 QMessageBox 消息对话框有如下成员，

 

QMessageBox::question的第三个参数QMessageBox::StandardButton有如下枚举

 

 

 //消息对话框为模态对话框

    QMessageBox::about(this,"about","this is a 消息对话框！！");
    QMessageBox::critical(this,"error!","this is a 错误对话框！！");
    int ret = QMessageBox::question(this,"question","你要打开这个文件吗？？",QMessageBox::Open,QMessageBox::Close);

    if(ret==QMessageBox::Open)
    {
        qDebug()<<"ret:"<<ret;
        QMessageBox::information(this,"inf","保存成功！！");

    }
    else if(ret==QMessageBox::Close)
    {
        QMessageBox::warning(this,"warning","错误！！！");