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 ./objapplication.o(.text+0x1033):application.cpp: undefined reference to `vtable for threadDnaa'
./objapplication.o(.text+0x1095):application.cpp: undefined reference to `vtable for threadDua'
./objapplication.o(.text+0x22e3):application.cpp: undefined reference to `vtable for threadDnaa'
./objapplication.o(.text+0x2345):application.cpp: undefined reference to `vtable for threadDua'

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//// application.h ////
class application : public QWidget
{
Q_OBJECT
public:
  application(QWidget* parent=0);
protected slots:
  void buttonDnaaClicked();
  void buttonDuaClicked();
  void shoutdown();
private:
  int startCheck;
  bool dnaaStarted,duaStarted;
  deleteNotActivatedAccounts *dnaa;
  deleteUnusedAccounts *dua;
  threadDnaa *dnaaThread;
  threadDua *duaThread;
  QLabel *labelDnaa,*labelDua;
  QPushButton *buttonDnaa,*buttonDua,*buttonExit;
};

//// application.cpp ////
application::application(QWidget* parent) : QWidget(parent)
{
  dnaa = new deleteNotActivatedAccounts();
  dua = new deleteUnusedAccounts();
  dnaaThread = new threadDnaa;
  duaThread = new threadDua;

  dnaaThread->dnaa = dnaa;
  duaThread->dua = dua;
  dnaaStarted = false;
  duaStarted = false;
...
void application::buttonDnaaClicked()
{
  if(dnaaStarted==false)
  {
    startCheck = dnaa->checkDependence();

    if(startCheck==1)
      QMessageBox::critical(this,"Start service","Error: Could not find config.txt file!");
    else if(startCheck==2)
      QMessageBox::critical(this,"Start service","Error: Could not connect to MySQL server.nCheck your config.");
    else
    {
      dnaaThread->start();
      dnaaStarted=true;
      buttonDnaa->setText("Stop");
    }
  }
  else
  {
    dnaa->exit = true;
    dnaaThread->wait();
    dnaaStarted = false;
...
void application::buttonDuaClicked()
{
  if(duaStarted==false)
  {
    startCheck = dua->checkDependence();

    if(startCheck==1)
      QMessageBox::critical(this,"Start service","Error: Could not find config.txt file!");
    else if(startCheck==2)
      QMessageBox::critical(this,"Start service","Error: Could not connect to MySQL server.nCheck your config.");
    else
    {
      duaThread->start();
      duaStarted=true;
      buttonDua->setText("Stop");
    }
  }
  else
  {
    dua->exit = true;
    duaThread->wait();
    duaStarted = false;
...
//// threadDnaa.h ////
class threadDnaa : public QThread
{
public:
  deleteNotActivatedAccounts *dnaa;
  virtual void run();
};

//// threadDnaa.cpp ////
void threadDnaa::run()
{
  dnaa->start();
}

//// threadDua.h ////
class threadDua : public QThread
{
public:
  deleteUnusedAccounts *dua;
  virtual void run();
};

//// tthreadDua.cpp ////
void threadDua::run()
{
  dua->start();
}

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TEMPLATE = app
TARGET = L2JWemaToolsV0.9
DEPENDPATH += .
INCLUDEPATH += .

CONFIG += qt thread warn_on
CONFIG += thread

# Input
HEADERS += application.h \
           config.h \
           dnaa.h \
           dua.h \
           extraString.h \
           extraTime.h \
           fileIO.h \
           mysqlConnection.h
SOURCES += application.cpp \
           config.cpp \
           dnaa.cpp \
           dua.cpp \
           extraString.cpp \
           extraTime.cpp \
           fileIO.cpp \
           L2JWemaToolsV0.9.cpp \
           mysqlConnection.cpp

MOC_DIR = moc
OBJECTS_DIR = obj

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qmake -o Makefile L2JWemaToolsV0.9.pro

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mingw32-make -f Makefile.Release

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class threadDnaa : public QThread
class threadDua : public QThread

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Q_Object

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class application : public QWidget

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threadDnaa.cpp
threadDua.cpp
threadDnaa.h
threadDua.h