Sending image in blocks via datastream does not work for other block sizes??



  • Hi

    I am sending an image via network in blocks of 20 as shown below:

    sender.cpp file****
    Sender::Sender(int no)
    {
    socket = new QUdpSocket( this );
    a = 0;
    img_block = 0;
    block_size = 20;
    num = no;

    if(num == 1)
    image = new QImage("C:/Users/Public/Pictures/Sample Pictures/Desert.jpg" );
    

    if( image->isNull() )
    qDebug() << "Failed to open test.jpg" ;
    QTimer *timer = new QTimer( this );

    timer->isSingleShot();
      QTimer::singleShot(1000, this, SLOT(broadcastLine()) );
      connect( this, SIGNAL(done()), this, SLOT(broadcastLine()) );
    

    }

    void Sender::broadcastLine()
    {

    QByteArray buffer( block_size+3*image->width(), 0 );
    QDataStream stream( &buffer, QIODevice::WriteOnly );
    stream.setVersion( QDataStream::Qt_5_5 );

    stream << (quint16)image->width() << (quint16)image->height();

    stream << img_block;

      for( int x=0; x<image->width(); ++x )
      {
                for(int y=block_size*a; y <block_size+(block_size*a);y++)
          {
    
              if( y < image->height())
              {
               QRgb rgb = image->pixel( x, y );
               stream << (quint8)qRed( rgb ) << (quint8)qGreen( rgb ) << (quint8)qBlue( rgb );
              }
              else
              {
                  img_block = y = a = 0;
                  img_block = -block_size;
              }
          }
      }
    
    
    if(num==1)
     socket->writeDatagram( buffer, QHostAddress::Broadcast,9988 );
    

    img_block = img_block + block_size;
    a++;

     emit done();
    

    }

    The above program works for block_size< 20 but not for 32 which I am interested. I dont have even the slightest idea of whats happening and even how to debug this?

    Regards


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