qt界面操作

    //控制死窗体
    int width = this->geometry().width();
    int height = this->geometry().height();
    this->setFixedSize(width,height);

 　　//定时器的使用
     　QTimer *serialReadTimer = new QTimer;        
　　　 connect(serialReadTimer,SIGNAL(timeout()),this,SLOT(readSerial()));
      serialReadTimer->start();

 // set display color size
        QBrush myBrush;
        QPalette myPalette;
        myBrush = QBrush(Qt::red,Qt::DiagCrossPattern);
        myPalette.setBrush(QPalette::Text,myBrush);
        ui->showDatabase->setPalette(myPalette);
        ui->showDatabase->setFont(QFont("Timers",));

 //qSqlTableModel tableView的使用
     model = new QSqlTableModel(this,db);
     model->setTable("node");
     //手动提交
         model->setEditStrategy(QSqlTableModel::OnManualSubmit);
         //修改tableView的列名
         model->setHeaderData(,Qt::Orientation::Horizontal,"state");
         model->select();
         ui->showDatabase->setModel(model);
         //根据内容自适应
         ui->showDatabase->resizeColumnsToContents();
         //hide header id
         QHeaderView *headerView = ui->showDatabase->verticalHeader();
         headerView->setHidden(true);
      //关闭数据库
     db.close();