[Qt-interest] QTcpSocket & QDataStream

[pmqt71]

Hi,

I'm sending data from a client to a server using QTcpSocket just as
described in the fortune example. But when the server reads, it finds the
data shifted by 4 bytes (in wich I find the length of the QByteArray used in
the client side).

Something similar happens in the following example. QByteArray::data (or
constData) is the same used by QTcpSocket to write a QByteArray.


*QByteArray ba;*
*char *ss = NULL;*
* *
*QDataStream ds(&ba, QIODevice::WriteOnly);*
*ds << "hello";*
*ss = ba.data();   //ss is empty*
*ss += 4;            //ss contains "hello"*

The first 4 bytes seems to contain the length of ba: 0,0,0,6

If I don't use QDataStream I have no extra bytes:
 *QByteArray ba;*
*char *ss = NULL;*
* *
*ba.append("hello");*
*ss = ba.data();   //ss contains "hello"*


I should skip the first 4 bytes before reading my data (that already contain
a length), but I don't find the same instruction in the fortune example.
Where is the problem in my code?
Qt 4.6.2 on xp

thanks
pm
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