std::istream to QByteArray

[mrdebug]

Can someone suggest me a way to convert a std::istream to QByteArray?
Regards.

[VRonin]

the question doesn't rally makes sense but anyway:

// std::istream is;
is.seekg (0, is.end);
const int length = is.tellg();
is.seekg (0, is.beg);
QByteArray readBytes;
readBytes.resize(length);
    is.read (readBytes.data(),length);

[mrdebug]

Many thanks for your quick help but seems to not work.
After many time I have found a solution.

        std::istream &StreamIn= Session.receiveResponse(Res);
        QByteArray QBAByteIn;
        char Buffer[128];
        while (!StreamIn.eof()) {
            int BytesIn= StreamIn.read(Buffer, sizeof(Buffer)).gcount();
            QBAByteIn.append(Buffer, BytesIn);
        }

Regards.