如何在qt中存儲此信息？ arraylist-ish？

Question

新蜜蜂在這裏。 對不起，如果有類似的問題，但我只是不知道如何正確地問它。事情是，我必須爲uni做一些項目，我現在被卡住了。 我通過udp獲取信息，需要存儲產品信息以傳遞到對象（汽車座標） 我必須爲20個對象執行此操作，因此它要複雜得多。 我有這個代碼，它應該作爲我的教授工作。告訴我，但我必須弄清楚，我自己如何存儲它。 試過QList和QMap，但我無法弄清楚如何有可能有

anArray [num] .posX = somenumber;

所以我必須將每輛車的座標存儲爲car1.x，car1.y，car1z然後在循環計數中增加; car2.x等等。

我不知道如果我的問題還是什麼我想問問是非常明顯的，但是請多多包涵

while(mSocket->hasPendingDatagrams()){ 
     QByteArray datagram; 
     QHostAddress crrAddress; 
     quint16 crrPort; 
     datagram.resize(int(mSocket->pendingDatagramSize())); 
     mSocket->readDatagram(datagram.data(), datagram.size(), &crrAddress, &crrPort);    
     double* resultList = new double[(datagram.size()/int(sizeof(double))) ]; 

     memcpy(&resultList[0], datagram.data(), size_t(datagram.size())); 

     for(quint16 count = 0; (count) < mVehicleCount; count++) { 
      mVehicleMap[mArrayOffset + count].ID = int16_t(resultList[7 + 11 * count]); 
      mVehicleMap[mArrayOffset + count].pose.position.x = resultList[(1 + 11 * count)]; 
      mVehicleMap[mArrayOffset + count].pose.position.y = resultList[(2 + 11 * count)]; 
      mVehicleMap[mArrayOffset + count].pose.position.z = resultList[(3 + 11 * count)]; 
      mVehicleMap[mArrayOffset + count].pose.orientation.x = resultList[(6 + 11 * count)]; 
     } 
     delete[] resultList; 

Answer 1

您可以使用QList或QVector類你的目標（Qt文檔：QList，QVector）。

爲QVector簡單的例子：

struct Vehicle 
    { 
     qint16 ID_; 
     double position_x_; 
     double position_y_; 
     double position_z_; 
     double orintation_x_; 
    }; 

    ... 

    QVector<Vehicle> vehicles(maxVehicleCount); // maxVehicalCount - you variable 

    ... 

    while(mSocket->hasPendingDatagrams()){ 
      QByteArray datagram; 
      QHostAddress crrAddress; 
      quint16 crrPort; 
      datagram.resize(int(mSocket->pendingDatagramSize())); 
      mSocket->readDatagram(datagram.data(), datagram.size(), &crrAddress, &crrPort);    
      double* resultList = new double[(datagram.size()/int(sizeof(double))) ]; 

      memcpy(&resultList[0], datagram.data(), size_t(datagram.size())); 

      for(quint16 count = 0; (count) < mVehicleCount; count++) { 
       vehicles[mArrayOffset + count].ID_ = qint16(resultList[7 + 11 * count]); 
       vehicles[mArrayOffset + count].position_x_ = resultList[(1 + 11 * count)]; 
       vehicles[mArrayOffset + count].position_y_ = resultList[(2 + 11 * count)]; 
       vehicles[mArrayOffset + count].position_z_ = resultList[(3 + 11 * count)]; 
       vehicles[mArrayOffset + count].orintation_x_ = resultList[(6 + 11 * count)]; 
      } 
      delete[] resultList; 
    } 

您也可以使用QMap類（QT doucmentation：QMap）：

struct Vehicle 
    { 
     qint16 ID_; 
     double position_x_; 
     double position_y_; 
     double position_z_; 
     double orintation_x_; 
    }; 

    ... 

    QMap<qint16, Vehicle*> vehicleMap; 

    ... 

    while(true/*mSocket->hasPendingDatagrams()*/){ 
      QByteArray datagram; 
      QHostAddress crrAddress; 
      quint16 crrPort; 
      datagram.resize(int(mSocket->pendingDatagramSize())); 
      mSocket->readDatagram(datagram.data(), datagram.size(), &crrAddress, &crrPort);    
      double* resultList = new double[(datagram.size()/int(sizeof(double))) ]; 

      memcpy(&resultList[0], datagram.data(), size_t(datagram.size())); 

      for(quint16 count = 0; (count) < mVehicleCount; count++) { 
       Vehicle* vehicle = new Vehicle(); 
       vehicle.ID_ = qint16(resultList[7 + 11 * count]); 
       vehicle.position_x_ = resultList[(1 + 11 * count)]; 
       vehicle.position_y_ = resultList[(2 + 11 * count)]; 
       vehicle.position_z_ = resultList[(3 + 11 * count)]; 
       vehicle.orintation_x_ = resultList[(6 + 11 * count)]; 
       vehicleMap.insert(vehicle.ID_, vehicle); 
      } 
      delete[] resultList; 
    }