undefined reference to `QUiLoader::QUiLoader(QObject*)'

[ashukla]

Dear Sir!
The following error occurs when I make the project.

mywidget.o: In function `MyWidget::MyWidget(QWidget*)':
mywidget.cpp:(.text+0x48): undefined reference to `QUiLoader::QUiLoader(QObject*)'
mywidget.cpp:(.text+0xb5): undefined reference to `QUiLoader::load(QIODevice*, QWidget*)'
mywidget.cpp:(.text+0x119): undefined reference to `QUiLoader::~QUiLoader()'
mywidget.cpp:(.text+0x153): undefined reference to `QUiLoader::~QUiLoader()'
mywidget.o: In function `MyWidget::MyWidget(QWidget*)':
mywidget.cpp:(.text+0x1c8): undefined reference to `QUiLoader::QUiLoader(QObject*)'
mywidget.cpp:(.text+0x235): undefined reference to `QUiLoader::load(QIODevice*, QWidget*)'
mywidget.cpp:(.text+0x299): undefined reference to `QUiLoader::~QUiLoader()'
mywidget.cpp:(.text+0x2d3): undefined reference to `QUiLoader::~QUiLoader()'
collect2: ld returned 1 exit status

mywidget.o: In function `MyWidget::MyWidget(QWidget*)':
mywidget.cpp:(.text+0x48): undefined reference to `QUiLoader::QUiLoader(QObject*)'
mywidget.cpp:(.text+0xb5): undefined reference to `QUiLoader::load(QIODevice*, QWidget*)'
mywidget.cpp:(.text+0x119): undefined reference to `QUiLoader::~QUiLoader()'
mywidget.cpp:(.text+0x153): undefined reference to `QUiLoader::~QUiLoader()'
mywidget.o: In function `MyWidget::MyWidget(QWidget*)':
mywidget.cpp:(.text+0x1c8): undefined reference to `QUiLoader::QUiLoader(QObject*)'
mywidget.cpp:(.text+0x235): undefined reference to `QUiLoader::load(QIODevice*, QWidget*)'
mywidget.cpp:(.text+0x299): undefined reference to `QUiLoader::~QUiLoader()'
mywidget.cpp:(.text+0x2d3): undefined reference to `QUiLoader::~QUiLoader()'
collect2: ld returned 1 exit status

To copy to clipboard, switch view to plain text mode 

//mywidget.h code is as follows

#ifndef MYWIDGET_H
#define MYWIDGET_H
#include <QtGui>
 
class MyWidget: public QDialog
{
	Q_OBJECT
 
public:
    MyWidget(QWidget *parent = 0);
 
};
#endif  //MYWIDGET_H

#ifndef MYWIDGET_H
#define MYWIDGET_H
#include <QtGui>

class MyWidget: public QDialog
{
	Q_OBJECT

public:
    MyWidget(QWidget *parent = 0);
       
};
#endif  //MYWIDGET_H

To copy to clipboard, switch view to plain text mode 

//mywidget.cpp code as follows;

#include "mywidget.h"
#include <QtUiTools/QUiLoader>
#include <QFile>
MyWidget::MyWidget(QWidget *parent)
     : QDialog(parent)
{
     QUiLoader loader;
     QFile file("dlgtextscroller.ui");
     file.open(QFile::ReadOnly);
     QWidget *myWidget = loader.load(&file, this);
     file.close();
 
     QVBoxLayout *layout = new QVBoxLayout;
     layout->addWidget(myWidget);
     setLayout(layout);
}

#include "mywidget.h"
#include <QtUiTools/QUiLoader>
#include <QFile>
MyWidget::MyWidget(QWidget *parent)
     : QDialog(parent)
{
     QUiLoader loader;
     QFile file("dlgtextscroller.ui");
     file.open(QFile::ReadOnly);
     QWidget *myWidget = loader.load(&file, this);
     file.close();

     QVBoxLayout *layout = new QVBoxLayout;
     layout->addWidget(myWidget);
     setLayout(layout);
}

To copy to clipboard, switch view to plain text mode 

//main.cpp code
#include <QApplication>
#include "mywidget.h"

int main(int argc, char **argv)
{
QApplication app(argc,argv);
MyWidget *dialog=new MyWidget;
dialog->show();

return app.exec();
}

What is wrong in this?