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class Ui_PostScan: public QWidget
{
public slots:
  void selectDialog();

public:
  Ui_PostScan();
  ~Ui_PostScan();
  QStringList createFullFileList(QString dir_name);
  QStringList createQueryFileList(QStringList files);
  QStringList createAnswerFileList(QStringList files);
  void createFinalFileList(QString dir_name);

#include "postscan.h"
#include <iostream> 
using namespace std;

void Ui_PostScan::selectDialog()
{
  listEdit->append("Yeah!");
  cout<<"Yeah!";
}
Ui_PostScan::Ui_PostScan()
{
        setupUi(this);
        cout<<"PostScan constructor\n";
connect(openButton,SIGNAL(clicked()),this,SLOT(selectDialog()));
        noAnswerRadio->setChecked(TRUE);
}

release\main.o(.text+0x1e2):main.cpp: undefined reference to `vtable for Ui_PostScan'
release\main.o(.text+0x1e9):main.cpp: undefined reference to `vtable for Ui_PostScan'
release\main.o(.text+0x2c3):main.cpp: undefined reference to `vtable for Ui_PostScan'
release\main.o(.text+0x2cf):main.cpp: undefined reference to `vtable for Ui_PostScan'
release\postscan.o(.text+0x69):postscan.cpp: undefined reference to `vtable for Ui_PostScan'
release\postscan.o(.text+0x70):postscan.cpp: more undefined references to `vtable for Ui_PostScan' follow