Obtain const QImage from QByteArray

[Fallen_]

What you probably want is:
from server:

QByteArray arr;
QDataStream stream(&arr, QIODevice::WriteOnly);
stream.setVersion(QDataStream::Qt_4_7);
 
QImage image = ...;
stream << image;

QByteArray arr;
QDataStream stream(&arr, QIODevice::WriteOnly);
stream.setVersion(QDataStream::Qt_4_7);

QImage image = ...;
stream << image;

To copy to clipboard, switch view to plain text mode 

then in client:

QDataStream stream(&some_socket, QIODevice::ReadOnly);
stream.setVersion(QDataStream::Qt_4_7);
 
QImage image = ...;
stream >> image;

QDataStream stream(&some_socket, QIODevice::ReadOnly);
stream.setVersion(QDataStream::Qt_4_7);

QImage image = ...;
stream >> image;

To copy to clipboard, switch view to plain text mode 

The operators are in the documentation, >> and << for QImageHope this helps