Problems with external symbols compiling plug in for network client

Hi, i want to write a plugin for my app to access network (LAN).
I allready has succesfully coded Plugins, but i dont know much about network coding and read the tutorials and so on.
On some point the compiler means he has a unresolved external symbol on QAbstractSocket::catchReadyRead(char *, __int64).

Connection.obj:-1: error: Nicht aufgelöstes externes Symbol ""protected: virtual __int64 __thiscall QAbstractSocket::catchReadyRead(char *,__int64)" (?catchReadyRead@QAbstractSocket@@MAE_JPAD_J@Z)".

I think this couldn't be because i have no method like this and i dont use such a method. I have commented out most of my stuff to get a compiled version to hunt the error down but i cant find the problem.The crazy thing is that i had this plugin running and get a connection to the server.

Here is my class that i hvae derived from QTcpSocket. I think there must be the problem because it derives from QAbstractSocket.

Code:

---

#ifndef GUICONNECTION_H
#define GUICONNECTION_H
 
#include <QTcpSocket>
 
class Connection : public QTcpSocket
{
  //Q_OBJECT
 
  public:
    Connection(QObject * iParent = NULL);
 
  private:
    enum ReadState
    {
      eNotReading,
      eReading
    };
 
    bool mInitialized; //!< connect with server is initialized
 
    //QDataStream mDataStream;
 
    ReadState   mReadState;
    qint64      mBytesToRead;
 
  /*
  private slots:
    void catchReadyReadData();
    void catchConnected();
    void catchDisconnected();
 
  signals:
    void newData(QByteArray & iByteArray);
  */
};
 
#endif // GUICONNECTION_H

---

Code:

---

#include "Connection.h"
 
Connection::Connection(QObject * iParent)
: QTcpSocket(iParent)
, mInitialized(false)
//, mDataStream()
, mReadState(eNotReading)
, mBytesToRead(0)
{
  //mDataStream.setVersion(QDataStream::Qt_4_6);
  //mDataStream.setDevice(this);
 
  /*
  connect(this, SIGNAL(readyRead()),
          this, SLOT(catchReadyReadData()));
 
  connect(this, SIGNAL(connected()),
          this, SLOT(catchConnected()));
  connect(this, SIGNAL(disconnected()),
          this, SLOT(catchDisconnected()));
  */
}
/*
void Connection::catchConnected()
{
  // send identification data
}
 
void Connection::catchDisconnected()
{
  mInitialized = false;
}
 
void Connection::catchReadyReadData()
{
  if(mReadState == eNotReading)
  {
    Q_ASSERT(mBytesToRead == 0); // must be zero here
 
    // first qint64 is expected size of data to read from server
    // if we dont have them we wait
    if(bytesAvailable() < (qint64)sizeof(quint64))
      return;
 
    // update size
    mDataStream >> mBytesToRead;
    mReadState = eReading;
  }
 
  if(mReadState == eReading)
  {
    Q_ASSERT(mBytesToRead); // must contain size of data to read
 
    // if we dont have reached expected buffer size we wait
    if( bytesAvailable() < mBytesToRead)
      return;
 
    // get data and emit them
    QByteArray byteArray;
    mDataStream >> byteArray;
 
    emit newData(byteArray);
 
    mReadState = eNotReading;
  }
}
*/

---

I have allready deleted all not needed files and rebuild whole plugin, but this wont work. (win32-msvc2008).

Does the compiler caches some data, for faster rebuilding?

thx for suggestions to solve the problem

[Edit]
Used Qt 4.6 with QtCreator but with win32-msvc2008 spec on WinXp

FortuneClient and Network-Chat are also no longer Buildable. WTF have i made? :) I try reinstalling Qt.

[Solved] Reinstallation of Qt solves the Problem.