portability problems?

Hello.

I have a question about the portability sending data between Windows and Linux or VxWorks.

I have this qt code to send data from a Windows machine.

Code:

---

QByteArray block;
		QDataStream out(&block, QIODevice::WriteOnly);
 
		QString string = QString(QLatin1String(this->mensajeEnviar.mensaje)) ;
		out.setVersion(QDataStream::Qt_4_0);
		out << (quint16)0;
		out <<string;
		out.device()->seek(0);
		out << (quint16)(block.size() - sizeof(quint16));
 
		if(tcpSocket->isWritable()){
 
		   tcpSocket->write(block);
 
 
		}

---

And the datas are arriving well when I use a qt program as receiver, but when i use the following c++ code to read in another machine the datas are not the expected.

Code:

---

// This is a wxworks command and in datagrama_rx char* type receives the sending datas.
 
if (recvfrom(descriptor, datagrama_rx, SIZE_DATAGRAMA, 0, 								 (sockaddr *)&direccion_origen, &addr_len) !=ERROR)
 
				mensajeRecibido.mensaje=datagrama_rx;

---

The problem is that datagrama_rx receives what I was written in block, i think the block.data() but when i do the assignation in mensajeRecibido.mensaje which is a char* too it is not well than and with qt code in windows it was working well.

I dont know if i am forgetting something important. Could somone help me?

Thank you in advance.