I have a thread that handles different connections from different computers.

I want to know when one of those connections (telnet) has been closed. I am trying to use the disconnect signal, but the method clientDisconnected is never called.

Qt Code: 
  1. # include <QTcpSocket>
  2.  
  3. # include <iostream>
  4. # include "client.h"
  5. # include "server.h"
  6. using namespace std;
  7.  
  8. Client :: Client(int socketDescriptor, Server *server, QObject *parent) : QThread(parent)
  9. {
  10.      this->socketDescriptor = socketDescriptor;
  11.      this->server = server;
  12.      chattingWith = new QString();
  13.      connect(this, SIGNAL(finished()), this, SLOT(finished()));
  14. }
  15.  
  16.  
  17. void Client :: run()
  18. {
  19.      cout << "void Client :: run()\n";
  20.      tcpSocket = new QTcpSocket();    
  21.      if(!tcpSocket->setSocketDescriptor(socketDescriptor))
  22.      {
  23.           cout << "Error - tcpSocket descriptor\n";
  24.           return;
  25.      }
  26.      connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readData()));
  27.      connect(tcpSocket, SIGNAL(disconnected()), this, SLOT(clientDisconnected()));
  28.      exec();
  29. }
  30.  
  31.  
  32. void Client :: readData()
  33. {
  34.      cout << "void Client :: readData()\n";
  35.      server->addClient("12345", this);
  36. }
  37.  
  38.  
  39. void Client :: clientDisconnected()
  40. {
  41.      cout << "void Client :: clientDisconnected()\n";
  42. }
  43.  
  44. void Client :: finished()
  45. {
  46.      cout << "The thread has finished\n";
  47. }
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Why ? What is wrong ?