Can somebody show how to read bytes?

[ChrisW67]

int size = f.size();
 
             QByteArray bytes = f.readAll();
 
             qDebug() << bytes; //outputs ""MZP
 
             qDebug() << bytes.toHex(); //Same output :(

int size = f.size();

             QByteArray bytes = f.readAll();
            
             qDebug() << bytes; //outputs ""MZP

             qDebug() << bytes.toHex(); //Same output :(

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Unpossible!