[Qt-interest] Transferring a QPixmap through QTcpSocket

[Joshua W Joseph]

Thank you all.
Its really unnerving me, because I have the process well mapped but I am
really unable to implement the idea. The resulting QPixmap is invalid, and
when loaded onto a QLabel nothing is displayed.

Thank you all for your responses.

On Thu, Apr 7, 2011 at 2:00 PM, Joshua W Joseph <
joshua at blueprint-group.co.ke> wrote:

> Hi All,
>
> I have two simple applications which are network based. The 'server' takes
> a screenshot of its computer. When a 'client' connects, it will receive the
> captured image. These are basically the fortune server/client examples
> modified to transmit images instead of text.
>
> Here is my code for sending the image:
>
>       QByteArray block;
>
>     QDataStream out(&block, QIODevice::WriteOnly);
>
>     out.setVersion(QDataStream::Qt_4_0);
>
>     out << (quint16)0;
>
>     out << originalPixmap;
>
>     qDebug() << "Pixmap Sent";
>
>     out.device()->seek(0);
>
>     out << (quint16)(block.size() - sizeof(quint16));
>
>     QTcpSocket *clientConnection = tcpServer->nextPendingConnection();
>
>     connect(clientConnection, SIGNAL(disconnected()),
>
>             clientConnection, SLOT(deleteLater()));
>
>     clientConnection->write(block);
>
>     clientConnection->disconnectFromHost();
>
>
> And here is my code for reading it
>
>      QDataStream in(tcpSocket);
>
>     in.setVersion(QDataStream::Qt_4_0);
>
>     if (blockSize == 0) {
>
>     if (tcpSocket->bytesAvailable() < (int)sizeof(quint64))
>
>             return;
>
>         in >> blockSize;
>
>     }
>
>     if (tcpSocket->bytesAvailable() < blockSize)
>
>         return;
>
>     QPixmap nextPixmap;
>
>     in >> nextPixmap;
>
>     originalPixmap = currentPixmap;
>
>     updateScreenshotLabel();
>
>     getFortuneButton->setEnabled(true);
>
>     received = false;
>
>
> The client receives some data, but how to I:
>     1. Ensure that all of the sent data is received, and
>     2. Convert the received data into a QPixmap so that it can be
> displayed.
>
> I know it sounds simple but i have racked  my brains for several days now
> and I just cant seem to get it. Please assist.
>
> Thank you in advance,
>
> Joshua W.
>
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