QDataStream does not read QByteArray type.

QByteArray fooByteArray;
QDataStream fooWriteDataStream(&fooByteArray, QIODevice::ReadWrite);

fooByteArray.append((quint32)42);
fooByteArray.append(QString("The answer to everything?").toLocal8Bit().constData());

qDebug() << "fooByteArray.constData():" << fooByteArray.constData();
qDebug() << "fooWriteDataStream.status():" <<  fooWriteDataStream.status();

qint32 value1;
char *cStringRead1 = new char[128];
fooWriteDataStream >> value1 >> cStringRead1;
qDebug() << "value1:" << value1;
qDebug() << "qPrintable(cStringRead1):" << qPrintable(cStringRead1);
delete [] cStringRead1;

QDataStream fooReadDataStream(&fooByteArray, QIODevice::ReadOnly);
qint32 value2;
char *cStringRead2 = new char[128];
fooReadDataStream >> value2 >> cStringRead2;
qDebug() << "value2:" << value2;
qDebug() << "qPrintable(cStringRead2):" << qPrintable(cStringRead2);
delete [] cStringRead2;