QTcpServer и QTcpSocket, как с ними работать? Опции

[ubuntu]

Хочу написать клент-серверное приложение на Qt, как я понимаю мне нужно использовать классы QTcpServer и QTcpSocket.
Но что-то я не могу понять, почему при соединении не вызывается newConnection, в моей классе производном от QTcpServer, хотя функция вроде виртуальная. И пока не совсем понятно, как строить взаимодействие слушающего сокета с соединениями.

[Gambit]

const CxInteraction * const m_pInteraction;

Ругается ((((
..\network_demo_1\/networkdemo.h:85: error: ISO C++ forbids declaration of 'CxInteraction' with no type
..\network_demo_1\/networkdemo.h:85: error: expected ';' before '*' token

Ну и далеее

CxConnectionThread::CxConnectionThread( qint32 qnSocket, QObject *pParent):QThread( pParent), m_pInteraction( (CxInteraction*)pParent)
{
m_qnSocket = qnSocket;
}

..\network_demo_1\/networkdemo.h: In constructor 'CxConnectionThread::CxConnectionThread(qint32, QObject*)':
..\network_demo_1\/networkdemo.h:102: error: class 'CxConnectionThread' does not have any field named 'm_pInteraction'
..\network_demo_1\/networkdemo.h:102: error: 'CxInteraction' was not declared in this scope
..\network_demo_1\/networkdemo.h:102: error: expected primary-expression before ')' token
In file included from ..\network_demo_1\main.cpp:2:
..\network_demo_1\/networkdemo.h: In member function 'virtual void CxConnectionThread::run()':

qCritical( "Error in file: %s, line: %d %s", __FILE__, __LINE__, __FUNCSIG__);

..\network_demo_1\/networkdemo.h:153: error: '__FUNCSIG__' was not declared in this scope
..\network_demo_1\/networkdemo.h: In member function 'CxConnectionThread* CxInteraction::CreateThread(qint32)':
..\network_demo_1\/networkdemo.h:193: warning: format '%x' expects type 'unsigned int', but argument 2 has type 'CxConnectionThread*'
..\network_demo_1\/networkdemo.h:197: error: '__FUNCSIG__' was not declared in this scope
..\network_demo_1\/networkdemo.h: In member function 'void CxInteraction::CloseThread()':
..\network_demo_1\/networkdemo.h:212: warning: format '%x' expects type 'unsigned int', but argument 2 has type 'CxConnectionThread*'