QImageWriter QImageReader and QSocket

[jordip]

Im trying to send webcam images to another machine, I want them to be sent using JPG.
I have tried several more complex attempts (with QByteArrray and sending total block size beforehand) where I always got black images on the other side but searching this forums I came out with this very minimal version:


In the sender (a thread that receive a socket and connect , this part is working)


Q_ASSERT(socket->state() == QAbstractSocket::ConnectedState);

QDataStream stream(socket);

stream.setVersion(QDataStream::Qt_4_5);

QImageWriter writer(stream.device(), "JPG");
writer.write(currentImage);

if(!socket->waitForBytesWritten())
qWarning()<<"ERROR: Unable to send image: "<<socket->




In the reader



if(!this->socket->waitForReadyRead())
{
qWarning()<<"ERROR: could not read image: "<<socket->errorString();
return;
}
QImageReader reader(stream.device(), "JPG"); // &image_buffer, "JPG");

if(!reader.read(this->img->image())) {
qWarning()<<"ERROR: Unable to read received image from buffer: "<<reader.errorString();
return;
}


This version will not working at all
The reader willl print
ERROR: Unable to read received image from buffer: "Unable to read image data"
ERROR: could not read image: "The remote host closed the connection"

Just as if notheing is sent.

I-m sure that the problem is obvious ...