This is the source for Basic Tutorial 6.

#include <Ogre.h>
 #include <OIS/OIS.h>
 #include <CEGUI/CEGUI.h>
 #include <CEGUI/RendererModules/Ogre/CEGUIOgreRenderer.h>
 
 using namespace Ogre;
 
 class ExitListener : public FrameListener
 {
 public:
     ExitListener(OIS::Keyboard *keyboard)
         : mKeyboard(keyboard)
     {
     }
 
     bool frameStarted(const FrameEvent& evt)
     {
         mKeyboard->capture();
         return !mKeyboard->isKeyDown(OIS::KC_ESCAPE);
     }
 
 private:
     OIS::Keyboard *mKeyboard;
 };
 
 class Application
 {
 public:
     void go()
     {
         createRoot();
         defineResources();
         setupRenderSystem();
         createRenderWindow();
         initializeResourceGroups();
         setupScene();
         setupInputSystem();
         setupCEGUI();
         createFrameListener();
         startRenderLoop();
     }
 
     ~Application()
     {
         mInputManager->destroyInputObject(mKeyboard);
         OIS::InputManager::destroyInputSystem(mInputManager);
 
         CEGUI::OgreRenderer::destroySystem();
 
         delete mListener;
         delete mRoot;
     }
 
 private:
     Root *mRoot;
     OIS::Keyboard *mKeyboard;
     OIS::InputManager *mInputManager;
     CEGUI::OgreRenderer *mRenderer;
     ExitListener *mListener;
 
     void createRoot()
     {
         mRoot = new Root();
     }
     
     void defineResources()
     {
         String secName, typeName, archName;
         ConfigFile cf;
         cf.load("resources.cfg");
 
         ConfigFile::SectionIterator seci = cf.getSectionIterator();
         while (seci.hasMoreElements())
         {
             secName = seci.peekNextKey();
             ConfigFile::SettingsMultiMap *settings = seci.getNext();
             ConfigFile::SettingsMultiMap::iterator i;
             for (i = settings->begin(); i != settings->end(); ++i)
             {
                 typeName = i->first;
                 archName = i->second;
                 ResourceGroupManager::getSingleton().addResourceLocation(archName, typeName, secName);
             }
         }
     }
     
     void setupRenderSystem()
     {
         if (!mRoot->restoreConfig() && !mRoot->showConfigDialog())
             throw Exception(52, "User canceled the config dialog!", "Application::setupRenderSystem()");
 
         //// Do not add this to the application
         //RenderSystem *rs = mRoot->getRenderSystemByName("Direct3D9 Rendering Subsystem");
         //                                      // or use "OpenGL Rendering Subsystem"
         //mRoot->setRenderSystem(rs);
         //rs->setConfigOption("Full Screen", "No");
         //rs->setConfigOption("Video Mode", "800 x 600 @ 32-bit colour");
     }
     
     void createRenderWindow()
     {
         mRoot->initialise(true, "Tutorial Render Window");
 
         //// Do not add this to the application
         //mRoot->initialise(false);
         //HWND hWnd = 0;  // Get the hWnd of the application!
         //NameValuePairList misc;
         //misc["externalWindowHandle"] = StringConverter::toString((int)hWnd);
         //RenderWindow *win = mRoot->createRenderWindow("Main RenderWindow", 800, 600, false, &misc);
     }
 
     void initializeResourceGroups()
     {
         TextureManager::getSingleton().setDefaultNumMipmaps(5);
         ResourceGroupManager::getSingleton().initialiseAllResourceGroups();
     }
 
     void setupScene()
     {
         SceneManager *mgr = mRoot->createSceneManager(ST_GENERIC, "Default SceneManager");
         Camera *cam = mgr->createCamera("Camera");
         Viewport *vp = mRoot->getAutoCreatedWindow()->addViewport(cam);
     }
 
     void setupInputSystem()
     {
         size_t windowHnd = 0;
         std::ostringstream windowHndStr;
         OIS::ParamList pl;
         RenderWindow *win = mRoot->getAutoCreatedWindow();
 
         win->getCustomAttribute("WINDOW", &windowHnd);
         windowHndStr << windowHnd;
         pl.insert(std::make_pair(std::string("WINDOW"), windowHndStr.str()));
         mInputManager = OIS::InputManager::createInputSystem(pl);
 
         try
         {
             mKeyboard = static_cast<OIS::Keyboard*>(mInputManager->createInputObject(OIS::OISKeyboard, false));
             //mMouse = static_cast<OIS::Mouse*>(mInputManager->createInputObject(OIS::OISMouse, false));
             //mJoy = static_cast<OIS::JoyStick*>(mInputManager->createInputObject(OIS::OISJoyStick, false));
         }
         catch (const OIS::Exception &e)
         {
             throw new Exception(42, e.eText, "Application::setupInputSystem");
         }
     }
 
     void setupCEGUI()
     {
         // CEGUI setup
         mRenderer = &CEGUI::OgreRenderer::bootstrapSystem();
 
         // Other CEGUI setup here.
     }
 
     void createFrameListener()
     {
         mListener = new ExitListener(mKeyboard);
         mRoot->addFrameListener(mListener);
     }
 
     void startRenderLoop()
     {
         mRoot->startRendering();
 
         //// Do not add this to the application
         //while (mRoot->renderOneFrame())
         //{
         //    // Do some things here, like sleep for x milliseconds or perform other actions.
         //    // However, make sure you call the display update function:
         //    WindowEventUtilities::messagePump();
         //}
     }
 };
 
 #if OGRE_PLATFORM == PLATFORM_WIN32 || OGRE_PLATFORM == OGRE_PLATFORM_WIN32
 #define WIN32_LEAN_AND_MEAN
 #include "windows.h"
 
 INT WINAPI WinMain(HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT)
 #else
 int main(int argc, char **argv)
 #endif
 {
     try
     {
         Application app;
         app.go();
     }
     catch(Exception& e)
     {
 #if OGRE_PLATFORM == PLATFORM_WIN32 || OGRE_PLATFORM == OGRE_PLATFORM_WIN32
         MessageBoxA(NULL, e.getFullDescription().c_str(), "An exception has occurred!", MB_OK | MB_ICONERROR | MB_TASKMODAL);
 #else
         fprintf(stderr, "An exception has occurred: %s\n",
             e.getFullDescription().c_str());
 #endif
     }
 
     return 0;
 }