QDataStream writing wrong values to QByteArray

I'm writing a simple TCP based network application in Qt and wanted to use QDataStream and QByteArray to send data over the network. The problem is that when I'm putting data into QByteArray they are "zeroed". For example (a slot in MainWindow that is connected to timer timeout signal):

void MainWindow::SendPlayer1Data(){
  QByteArray block;
  QDataStream s(&block, QIODevice::OpenModeFlag::ReadWrite);
  QString h="hello";
  s<<h;
  qDebug() << "h:        " << data;
  qDebug() << "block:    " << QString(block); // equivalent to s >> h on receiving end
  qDebug() << "block[0]: " << int(block[0]);
}

h:         "hello"
block:     ""
block[0]:  0

I receive "hello" once at the beginning but after that I only get "". The same goes for qint32. Both client and server shows that QByteArray size is 14 bytes, so QDataStream writes data into that array, but it makes them 0 (it shows "" when I use s >> h and then use qDebug() << h)

Solution

Ok, I have figured it out. The problem was not the QByteArray or socket because, as @William Miller mentioned, the data was there. The problem was with QDataStream on client side - I decided to create a new QDataStream object every time the slot responsible for receiving data was called. This way I was able to pack data easily into QByteArray, send it and receive every time. The client function for receiving:

void ClientTcpHelper::ReceivePacket(){

if(socket.waitForReadyRead(20)){

    //qDebug()<<"Packet: "<<socket.peek(30)<<endl;
    qDebug()<<"Receiving packet!"<<endl;

    Data=socket.readAll();
    emit DataReceived();


}
else{
    //qDebug()<<"Failed to receive packet!"<<endl;

}}

and unpacking data to variables:

void ClientTcpHelper::UnpackData(){

stream=new QDataStream (&this->Data,QIODevice::OpenModeFlag::ReadWrite);
*stream>>h>>a>>b;
Data.clear();
delete stream;}

h,a and b are members of a class.

Unfortunately I can not explain why QDataStream need to be destroyed every time here in order to handle data as I wanted it from the beginning.