How do I use QTcpSocket properly ?

[mnemonic_fx]

Ok, I think I understand about dynamic allocation and using pointers, I try to use that, but still.. it doesn't solve my problem.

I declare CMsgSession *session on CMsgClient private member.
I write this on the constructor :

CMsgClient::CMsgClient()
{
	session = new CMsgSession();
}

CMsgClient::CMsgClient()
{
	session = new CMsgSession();
}

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And I declare QTcpSocket *tcpSocket on CMsgSession public member, I write this on the constructor :

CMsgSession::CMsgSession(QObject *parent) : QThread(parent), workerQuitFlag(false)
{
    tcpSocket = new QTcpSocket();
}

CMsgSession::CMsgSession(QObject *parent) : QThread(parent), workerQuitFlag(false)
{
    tcpSocket = new QTcpSocket();
}

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and I access the tcpSocket like this :

session->tcpSocket->write(buf, len);

it causes access violation, it's getting more confusing,
but thanks anyway..