QDataStream in(tcpSocket);
        in.setVersion(QDataStream::Qt_4_0);

        if (blockSize == 0) {
            if (tcpSocket->bytesAvailable() < (int)sizeof(quint16))
                return;

            in >> blockSize;
        }

        if (tcpSocket->bytesAvailable() < blockSize)
            return;

        QString nextFortune;
        in >> nextFortune;

        if (nextFortune == currentFortune) {
            QTimer::singleShot(0, this, SLOT(requestNewFortune()));
            return;
        }

        currentFortune = nextFortune;

QString str;
QByteArray block;
...
block.append(str);
write(block);

QByteArray Str;
Str=tcpSocket.readAll();