Qt Code: 
  1. class ClientThread : public QThread
  2. {
  3.   Q_OBJECT
  4.  
  5. public:
  6.     ClientThread(QObject *parent,int descriptor);
  7.     ~ClientThread();
  8.  
  9. private:
  10.   int descriptor;
  11.   void run();
  12.  
  13. private slots:
  14.   void onFinish();
  15.   void tcpError( QAbstractSocket::SocketError error );
  16.   void onStateChanged( QAbstractSocket::SocketState socketState);
  17.  
  18. };
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Qt Code: 
  1. #include "clientthread.h"
  2.  
  3. ClientThread::ClientThread(QObject *parent, int descriptor)
  4.   : QThread(parent)//, socket(this)
  5. {
  6.   this->descriptor=descriptor;
  7.   qWarning("ClientThread::ClientThread() %d\n", QThread::currentThreadId()); 
  8.  
  9.   connect(this,SIGNAL(finished()),this,SLOT(onFinish()));  
  10.  
  11. }
  12.  
  13. ClientThread::~ClientThread()
  14. {
  15.  
  16. }
  17.  
  18. void ClientThread::run(){
  19.  
  20.   QTcpSocket socket;
  21.  
  22.    if( !socket.setSocketDescriptor( descriptor ) )
  23.   {
  24.     qDebug( "Socket error!" );
  25.     return;
  26.   }
  27.   connect(&socket,SIGNAL( stateChanged (QAbstractSocket::SocketState)),this,SLOT (onStateChanged(QAbstractSocket::SocketState)));
  28.   connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)),this, SLOT(tcpError(QAbstractSocket::SocketError)) );
  29.  
  30.   QString add=socket.peerAddress().toString();
  31.   qWarning()<<add;
  32.  
  33.   qWarning("ClientThread::run() %d\n", QThread::currentThreadId()); 
  34.   exec();// this will keep the thread running.
  35. }
  36.  
  37. void ClientThread::onFinish(){
  38. int a = 12;
  39.  
  40. }
  41.  
  42.  
  43.  
  44. void ClientThread::tcpError(QAbstractSocket::SocketError error){
  45.  
  46.   if( error == QAbstractSocket::RemoteHostClosedError )
  47.     return;
  48.  
  49. }
  50.  
  51. void ClientThread::onStateChanged( QAbstractSocket::SocketState socketState){
  52. qWarning("ClientThread::onStateChanged() %d\n", QThread::currentThreadId()); 
  53.   switch (socketState){
  54.   case QAbstractSocket::UnconnectedState:
  55.          qWarning()<<"UnconnectedState";
  56.   default:
  57.     qWarning()<<socketState;
  58.   }
  59.  
  60.  
  61. }
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this two lines are not working :

connect(&socket,SIGNAL( stateChanged (QAbstractSocket::SocketState)),this,SLOT (onStateChanged(QAbstractSocket::SocketState)));
connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)),this, SLOT(tcpError(QAbstractSocket::SocketError)) );

and show error:

"QObject::connect: Cannot queue arguments of type 'QAbstractSocket::SocketError'
(Make sure 'QAbstractSocket::SocketError' is registered using qRegisterMetaType(
).)
QObject::connect: Cannot queue arguments of type 'QAbstractSocket::SocketState'
(Make sure 'QAbstractSocket::SocketState' is registered using qRegisterMetaType(
).)"

can anyone tell me how to link the signals of QtcpSocket to the slot in side of qthread???

qt is fucked