[Interest] reading from and writing to a file with QDataStream

[Thiago Macieira]

On terça-feira, 8 de março de 2016 09:05:50 PST Sina Dogru wrote:
> Thank you for writing Thiago,
> 
> > The problem is here. You've removed the bug from the sample source. So we
> > can't help you.
> 
> Well I might made a mistake, I am kind of a amatuer programmer but on the
> real code, the problem is also same. I mean after I read stream to string,
> string is empty.
> But for now it is working. Like you and others pointed, the problem was I
> was reading different size of bytes.

The problem is that the section you commented out could have hidden other 
bugs. You didn't show how module A added to the data to be transmitted.

> > Most likely module A is overwriting the byte array, instead of appending
> > to
> > it.
> 
> I approach to QByteArray like std::string.

That doesn't mean anything.

> > Did you really mean to write a datastream that contains a datastream
> > inside?
> > Did you mean to nest one inside the other?
> 
> Ah can you be more specific please? Because I have just cheated from qt-docs
> <http://doc.qt.io/qt-5/qdatastream.html#details> writing to and reading
> from a file if you are talking about constructing a QDataStream from a
> QFile.

Indeed, but look at how you've combined two or more examples. You have a byte 
array, you create a QDataStream on it, write some data, then you used 
QDataStream to write that byte array to another byte array. You probably 
didn't want that.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center