udp receive data problem

[zxwmail]

hi ,folks,i have a problem in qbytearray to float array,i received float array in udp,but return value is 0,what's wrong with me?can u help me?tks.i have searched in google.
the sender program is write by labwindows cvi.
cvi code:

float AIdat[344];
UDPWrite(writerChannel, AI_PORT, MULTICAST_ADDRESS, AIdat, sizeof(AIdat));

float AIdat[344];
UDPWrite(writerChannel, AI_PORT, MULTICAST_ADDRESS, AIdat, sizeof(AIdat));

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qt code:

const udpsize=1376;
    void Widget::processPendingDatagrams()
    {
          qint16 packetsize;
          while (udpSocket->hasPendingDatagrams()) {
                  QByteArray ba;
                  packetsize=udpSocket->pendingDatagramSize();
                  ba.resize(packetsize);
                  udpSocket->readDatagram(ba.data(), ba.size());
                  if (packetsize!=udpsize)
                 {
                         return;
                  }      
                  // bool ok;
                  // ba = QByteArray::number(ba.toLongLong(&ok,16),2);      
                  QDataStream  datin(&ba,QIODevice::ReadOnly);
                  float firstdat;
                  datin>>firstdat;    //first float data
                  if (!datin.status())
                  {
                          qDebug()<<"ok" ;
                   }
                    qDebug()<<firstdat; //it return 0 or inf;
           }
    }

const udpsize=1376;
    void Widget::processPendingDatagrams()
    {
          qint16 packetsize;
          while (udpSocket->hasPendingDatagrams()) {
                  QByteArray ba;
                  packetsize=udpSocket->pendingDatagramSize();
                  ba.resize(packetsize);
                  udpSocket->readDatagram(ba.data(), ba.size());
                  if (packetsize!=udpsize)
                 {
                         return;
                  }      
                  // bool ok;
                  // ba = QByteArray::number(ba.toLongLong(&ok,16),2);      
                  QDataStream  datin(&ba,QIODevice::ReadOnly);
                  float firstdat;
                  datin>>firstdat;    //first float data
                  if (!datin.status())
                  {
                          qDebug()<<"ok" ;
                   }
                    qDebug()<<firstdat; //it return 0 or inf;
           }
    }

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