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Send object with QByteArray

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kevindebb

Beginner

  • "kevindebb" started this thread

Posts: 4

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1

Tuesday, May 8th 2012, 3:47pm

Send object with QByteArray

Hello everybody,

I would like to transfer a custom object with qbytearray. I tried to send "TetrixShape board[BoardWidth * BoardHeight];" This is a custom object.
I would think that if you append this to qbytearray that this object will be converted to a bytearray. But this doesn't happen. I get the following error: invalid conversion from 'TetrixShape*' to 'char' and

Can somebody help me?

Thanks

Source code

 
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TetrixShape board[BoardWidth * BoardHeight];


...


QByteArray data;
data.append(board);
emit send_board(board);

...


 void server::send_data(QByteArray data)
 {
 QDataStream out(&data, QIODevice::WriteOnly);
 out << (quint16)0;
 out << data;
 out.device()->seek(0);
 out << (quint16)(data.size() - sizeof(quint16));
 connection->write(data);
 qDebug()<<data;
 
 }

Amleto

Professional

Posts: 1,430

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2

Tuesday, May 8th 2012, 6:53pm

you can't simply expect that your class will convert into char* and be able to send it. If you could, there would be no need for serialisation, e.g. boost serialisation.

only POD types can be 'easily'* converted to byte array.


* and even if you can easily convert it, there is no guarantee that another computer will convert it back in the desired way.
If you have a problem, CUT and PASTE your code. Do not retype or simplify it. Give a COMPLETE and COMPILABLE example of your problem. Otherwise we are all guessing the problem from a fabrication where relevant details are often missing.

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Used tags

QByteArray, tcp