Converting littleEndian via QDataStream - c++

Question

i want to send some integers (int32_t) via network.
For this I convert the integers first and send them.
p.x = 129;
p.y = 42;
p.d = counter++;
converted[0] = htonl(p.x);
converted[1] = htonl(p.y);
converted[2] = htonl(p.d);
if ( (bytes = send(socket, (char *)converted, pointSize, 0)) < 0)
{
std::cerr << "bytes = " << bytes << std::endl;
}
Then Qt should do the work, so I tried a QDataStream conversion but that failed, values > 128 got negative. So currently I do a conversion like this:
while ( socket->bytesAvailable() > 0 )
{
//qDebug() << "Data received" << socket->bytesAvailable();
m_data.append(socket->readAll());
//qDebug() << "Buffer " << m_data.size();
if (m_data.size() >= sizeOfPoint)
{
Point x;
QByteArray b = m_data.left(sizeOfPoint);
for (int i = 0; i < 4; i++)
{
x.x += (u_int8_t) b[i] << 8*(3-i);
}
for (int i = 4; i < 8; i++)
{
x.y += (u_int8_t) b[i] << 8*(7-i);
}
for (int i = 8; i < 12; i++)
{
x.d += (u_int8_t) b[i] << 8*(11-i);
}
//x.x = (u_int8_t) (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
//x.y = (b[4] << 24) | (b[5] << 16) | (b[6] << 8) | (b[7]);
//x.d = (b[8] << 24) | (b[9] << 16) | (b[10] << 8) | b[11];
//x.d = b[10] << 8;
//x.d = (b[11]);
//QDataStream in(buffer.data());
//in.setByteOrder(QDataStream::LittleEndian);
//in >> conv[1];
//in >> conv[2];
qDebug() << "Data provided " << x.x << " " << x.y << " "<< x.d;
m_data.remove(0, sizeOfPoint);
}
}
What is the best way to convert these integers, the for loop seems not optimal for me.
Thank you