how to use qtcpsocket send qimage data

[tsuibin]

my tcpserver code

void UserThread::sendData()
{
    qDebug() << "sendData";
 
#ifdef TEST
    qDebug() << "TEST";
    QImage image("3.png");
    QByteArray ba;
 
    qDebug() << image.byteCount() <<image.size();
    ba.append((char *)image.bits(),image.byteCount());
    qDebug() <<ba.size();
    this->m_tcpSocket->write(ba);
    if(!this->m_tcpSocket->waitForBytesWritten(-1)) 
    {
            qDebug() << "writen Bytes error " << this->m_tcpSocket->errorString();
    }
    this->m_tcpSocket->flush();
#endif
}

void UserThread::sendData()
{
    qDebug() << "sendData";

#ifdef TEST
    qDebug() << "TEST";
    QImage image("3.png");
    QByteArray ba;

    qDebug() << image.byteCount() <<image.size();
    ba.append((char *)image.bits(),image.byteCount());
    qDebug() <<ba.size();
    this->m_tcpSocket->write(ba);
    if(!this->m_tcpSocket->waitForBytesWritten(-1)) 
    {
            qDebug() << "writen Bytes error " << this->m_tcpSocket->errorString();
    }
    this->m_tcpSocket->flush();
#endif
}

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client code

void MainWindow::readImage(){
    qDebug() << socket.bytesAvailable();
    QByteArray ba;
    ba = socket.readAll();
    socket.flush();
    qDebug() << ba.size();
    QImage image((uchar *)ba.data(),1024,768,QImage::Format_RGB32);
    ui->label->setPixmap(QPixmap::fromImage(image));
}

void MainWindow::readImage(){
    qDebug() << socket.bytesAvailable();
    QByteArray ba;
    ba = socket.readAll();
    socket.flush();
    qDebug() << ba.size();
    QImage image((uchar *)ba.data(),1024,768,QImage::Format_RGB32);
    ui->label->setPixmap(QPixmap::fromImage(image));
}

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my picture at attachment

server read the picture sizse is 3145728

but client recevie a wrong size
i used flush
but ...