Cannot able to display the comports availability in the combobox

I am trying to display the comports availability in the system to be displayed in the combobox. it show some errors..
as shown below

D:\New Folder\untitled-build-desktop\..\untitled\mainwindow.cpp:35: error: undefined reference to `SerialDeviceEnumerator::instance()'

D:\New Folder\untitled-build-desktop\..\untitled\mainwindow.cpp:37: error: undefined reference to `SerialDeviceEnumerator::devicesAvailable() const'

I have used serialdeviceenumerator and abstract serial classes and i have attached my code also. kindly any one help me and replies are appreciated.

Untitled .h

Code:

---

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QtGui>
#include <QWidget>
 
#include <abstractserial.h>
 
class SerialDeviceEnumerator;
class AbstractSerial;
 
namespace Ui {
    class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private slots:
     void on_comboBox_textChanged(const QStringList &arg1);
     void initenum();
 
private:
    Ui::MainWindow *ui;
    SerialDeviceEnumerator *m_sde;
    //AbstractSerial *serial;
    QComboBox *cmbPorts;
    QPushButton *start;
 
};

---

untitled.cpp

Code:

---

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
#include <QtGui>
#include <QtCore/QDebug>
#include <QtCore/QStringList>
 
#include <iostream>
#include <serialdeviceenumerator.h>
#include <abstractserial.h>
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
   ui->setupUi(this);
 
   initenum();
 
 
//   this->m_sde = new SerialDeviceEnumerator(this);
//   this->m_sde->setEnabled(true);
 
 //  QStringList devList = m_sde->devicesAvailable();
 
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::initenum()
{
    this->m_sde = SerialDeviceEnumerator::instance();
    connect(this->m_sde, SIGNAL(QStringList)),this,SLOT(on_comboBox_textChanged(QStringList)));
    this->on_comboBox_textChanged(this->m_sde->devicesAvailable());
}
 
 
void MainWindow::on_comboBox_textChanged(const QStringList &arg1)
{
    cmbPorts->clear();
    cmbPorts->addItems(arg1);
}

---

Uncheck option "Shadow Build" in QtCreator (if you build with it).
In .pro file HEADERS += serialdeviceenumerator.h abstractserial.h SOURCES += serialdeviceenumerator.cpp abstractserial.cpp

i have unchecked that shadow build option but still i couldn't get it.

Add the library containing the implementation of SerialDeviceEnumerator and AbstractSerial to your LIBS variable.