[Qt-interest] Transferring a QPixmap through QTcpSocket

[Joshua W Joseph]

Thanks alot all of you, especially Thiago,

I finally got it working. The trick was to read the data after the
QTcpSocket connection was closed rather than reading it when
readyRead() was emitted.

Here is my server code:

    QByteArray block;
    QDataStream out(&block, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_7);
    out << ui->lblScreenShot->pixmap()->toImage();
    QTcpSocket *client = pixmapServer->nextPendingConnection();
    connect (client, SIGNAL(disconnected()), client, SLOT(deleteLater()));
    client->write(block);
    qDebug() << block.size();
    client->disconnectFromHost();

It reads the QPixmap from a label, and here is the client code:

    QDataStream in(socket);
    in.setVersion(QDataStream::Qt_4_7);
    QImage img;
    in >> img;
    ui->screenshotLabel->setPixmap(QPixmap::fromImage(img));

As you can see, its all so choppy, but at least I can start up from there.

Thanks.

On 4/7/11, Thiago Macieira <thiago at kde.org> wrote:
> On Thursday, 7 de April de 2011 15:54:20 Andre Somers wrote:
>> Op Do, 7 april, 2011 3:28 pm, schreef Thiago Macieira:
>> > Given that the OP was closing the socket just after writing the pixmap
>> > data,
>>
>> > then sending the length in advance is unnecessary. Conclusion:
>> Is it? If you use that, wouldn't you need to check on the receiving end
>> that it was actually the user closing the socket, an not the network
>> connection failing or something like that?
>
> That is correct.
>
> --
> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
>   Senior Product Manager - Nokia, Qt Development Frameworks
>       PGP/GPG: 0x6EF45358; fingerprint:
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