I am using tree view and list view to display the contents of QFilesystem model...
When i used Dialog to display the Tree View and List view , it works properly....
But when i used QMainWindow instead of QDialog, i'm getting run time error saying
"The program has unexpectedly finished."

my code as below...
Qt Code: 
  1. #ifndef MAINWINDOW_H
  2. #define MAINWINDOW_H
  3.  
  4. #include <QMainWindow>
  5. #include <QtGui>
  6. #include <QtCore>
  7.  
  8.  
  9. namespace Ui {
  10.     class MainWindow;
  11. }
  12.  
  13. class MainWindow : public QMainWindow
  14. {
  15.     Q_OBJECT
  16.  
  17. public:
  18.  
  19.     explicit MainWindow(QWidget *parent = 0);
  20.     ~MainWindow();
  21.  
  22. private slots:
  23.  
  24.     void on_treeView_clicked(const QModelIndex &index);
  25.  
  26. private:
  27.  
  28.     Ui::MainWindow *ui;
  29.     QFileSystemModel *dirmodel;
  30.     QFileSystemModel *filemodel;
  31.  
  32. };
  33.  
  34. #endif // MAINWINDOW_H
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mainwindow.ui
Qt Code: 
  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <ui version="4.0">
  3.  <class>MainWindow</class>
  4.  <widget class="QMainWindow" name="MainWindow">
  5.   <property name="geometry">
  6.    <rect>
  7.     <x>0</x>
  8.     <y>0</y>
  9.     <width>621</width>
  10.     <height>591</height>
  11.    </rect>
  12.   </property>
  13.   <property name="windowTitle">
  14.    <string>MainWindow</string>
  15.   </property>
  16.   <widget class="QWidget" name="centralWidget">
  17.    <widget class="QTreeView" name="treeView">
  18.     <property name="geometry">
  19.      <rect>
  20.       <x>30</x>
  21.       <y>150</y>
  22.       <width>311</width>
  23.       <height>331</height>
  24.      </rect>
  25.     </property>
  26.    </widget>
  27.    <widget class="QListView" name="listView">
  28.     <property name="geometry">
  29.      <rect>
  30.       <x>365</x>
  31.       <y>160</y>
  32.       <width>231</width>
  33.       <height>361</height>
  34.      </rect>
  35.     </property>
  36.    </widget>
  37.   </widget>
  38.   <widget class="QMenuBar" name="menuBar">
  39.    <property name="geometry">
  40.     <rect>
  41.      <x>0</x>
  42.      <y>0</y>
  43.      <width>621</width>
  44.      <height>21</height>
  45.     </rect>
  46.    </property>
  47.   </widget>
  48.   <widget class="QToolBar" name="mainToolBar">
  49.    <attribute name="toolBarArea">
  50.     <enum>TopToolBarArea</enum>
  51.    </attribute>
  52.    <attribute name="toolBarBreak">
  53.     <bool>false</bool>
  54.    </attribute>
  55.   </widget>
  56.   <widget class="QStatusBar" name="statusBar"/>
  57.  </widget>
  58.  <layoutdefault spacing="6" margin="11"/>
  59.  <resources/>
  60.  <connections/>
  61. </ui>
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mainwindow.cpp
Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3. #include <QtGui>
  4. #include <QtCore>
  5.  
  6.  
  7. MainWindow::MainWindow(QWidget *parent) :
  8.     QMainWindow(parent),
  9.     ui(new Ui::MainWindow)
  10. {
  11. ui->setupUi(this);
  12.  
  13. QString sPath ="C:/";
  14.  
  15. dirmodel =new QFileSystemModel(this);
  16. dirmodel->setFilter(QDir::NoDotAndDotDot | QDir::AllDirs);
  17. dirmodel->setRootPath(sPath);
  18. ui->treeView->setModel(dirmodel);
  19.  
  20.  
  21. filemodel =new QFileSystemModel(this);
  22. filemodel->setFilter(QDir::NoDotAndDotDot | QDir::Files);
  23. filemodel->setRootPath(sPath);
  24. ui->listView->setModel(filemodel);
  25.  
  26. }
  27.  
  28. MainWindow::~MainWindow()
  29. {
  30.     delete ui;
  31. }
  32.  
  33. void MainWindow::on_treeView_clicked(const QModelIndex &index)
  34. {
  35.  QString sPath=dirmodel->fileInfo(index).absoluteFilePath();
  36.  ui->listView->setRootIndex(filemodel->setRootPath(sPath));
  37. }
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Please tell me whats the wrong here..?