问如何将这些信息存储在qt中？列车员？
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Stack Overflow用户

提问于 2016-06-07 14:40:25

回答 1查看 573关注 0票数 1

新蜜蜂来了。我很抱歉，如果有类似的问题，但我只是不知道如何正确地问它。问题是，我必须为大学做一些项目，现在我被困住了。我是通过udp获得信息，需要存储输出信息，以传递给对象(汽车坐标)，我必须为20个对象这样做，因此它要复杂得多。我有这段代码，它应该是我的教授。告诉我了，但我得自己想办法把它储存起来。试过QList和QMap，但我想不出怎么可能

anArraynum.posX=somenumber；

所以我必须存储每辆车的坐标，当car1.x，car1.y，car1z，然后循环计数增加；car2.x等等。

我不知道我的问题或我想问的问题是否足够清楚，但请耐心等待

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;

arrays

qlist

qmap

qvector

回答 1

Stack Overflow用户

回答已采纳

发布于 2016-06-07 21:36:44

您可以使用QList或QVector类来实现目标(Qt文档：QList、QVector)。

QVector的简单示例

    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;
    }

您还可以使用QMap类(Qt加法：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;
    }