Send and Receive Double Array (double * ) over QTcpSocket

[Ayse]

In QT C++ I can send packet over QTcpSocket by using QDataStream for double, int , QString.. data types. But I want to send array of doubles by using QDataStream. My double array function in shown in this code block.

double * array = generatePacketDoubleArray(1,10,0.001);

Generate Double Array Function :

double * Producer::generatePacketDoubleArray(int packetNum,int maxlen,double stepDouble)
{
    double *array = new double[maxlen];

    double increase = 0;

    for(int i=0;i<maxlen;++i)
    {
        increase += stepDouble;
        array[i] = stepDouble*maxlen*packetNum+increase;
    }
    return array;
}

I want to send my double array packet same as this code blocks by using QDataStream in Server Side and Receive double * from QDataStream in Client Side . But I could not find a solution for cast double * to QByteArray . I want to learn this cast operation.

Regards..

        QByteArray block;
        QDataStream out(&block, QIODevice::WriteOnly);
        out.setVersion(QDataStream::Qt_4_0);

        out << static_cast<qint32>(packet.packetNum)
            << static_cast<qint32>(packet.data)
            << static_cast<qint32>(packet.packetSize);

[Ayse]

@Ayse

I found solution ;

In Server Side :

        doubleArray = generatePacketDoubleArray(counter,maxlen,0.001);
        Packet packet(counter,doubleArray);

        QByteArray block;
        QDataStream out(&block, QIODevice::WriteOnly);
        out.setVersion(QDataStream::Qt_4_0);

        out << static_cast<qint32>(packet.packetNum)
            << QByteArray::fromRawData(reinterpret_cast<const char*>(packet.doubleArrayData),maxlen*sizeof(double));

        qDebug() << "Packet Num : " << counter << " Bytes Written -> " << tcpServerConnection->write(block);

        tcpServerConnection->waitForBytesWritten();

In Client Side :

        qint32 packetNum ;
        QByteArray byteArray;

        in >>packetNum >> byteArray;

        qDebug() << "Packet Num : " <<packetNum;

        double doubleArray[maxlen];
        memcpy(doubleArray, byteArray.data(),byteArray.count());

        for(int i = 0;i<maxlen;i++)
            printf("%f   ",doubleArray[i]);
        printf("\n");

[Buckwheat]

@Ayse, Great recovery! I was looking at your first post and saying... how do I read the array when I don't know how long it is! :D