QT UDP SEND DOUBLE

[Surizer]

Hey guys i am new to QT , I am trying to send and receive datagram from simulink and QT. Successfully i was able to send variables from simulink to QT. Now am trying to send variables to simulink from QT. I am not sure how i am suppose to send a double variable from QT. It would be nice if someone can help me to send double type values .I have also attached the simulink side as a screenshot

#include "myudp.h"
double prev_a[3];

MyUDP::MyUDP(QObject *parent) :
    QObject(parent)
    {
        socket = new QUdpSocket(this);
        socket->bind(QHostAddress::LocalHost, 25000);
        connect(socket, SIGNAL(readyRead()), this, SLOT(readyRead()));
    }
/*    void MyUDP::HelloUDP() // instead of sending HelloUDP i want to send a double type variable.
    {
        QByteArray Data;
        Data.append("F");

        socket->writeDatagram(Data, QHostAddress::LocalHost, 26000);
    }
*/

void MyUDP::readyRead()
{
    double a[4];

    QByteArray buffer;
    buffer.resize(socket->pendingDatagramSize());

    QHostAddress sender;
    quint16 senderPort;

    socket->readDatagram(buffer.data(), buffer.size(),
                         &sender, &senderPort);

    memcpy(&a, buffer, 3*sizeof(double));

    if(a[0] != prev_a[0] || a[1] != prev_a[1] || a[2] != prev_a[2])
    {
        qDebug() << "\nMessage from: " << sender.toString();
        qDebug() << "Message port: " << senderPort;
        qDebug() << "X:" << a[0];
        qDebug() << "Y:" << a[1];
        qDebug() << "V:" << a[2];
    }
    else {
        qDebug() << "error";

    }
    prev_a[0] = a[0];
    prev_a[1] = a[1];
    prev_a[2] = a[2];

}

[SGaist]

Hi,

What about using QByteArray::number ?