从学案例入手

				// Ex2.cpp : Defines the class behaviors for the application.
				//
				
				#include "stdafx.h"
				#include "Ex2.h"
				#include "Ex2Dlg.h"
				
				#ifdef _DEBUG
				#define new DEBUG_NEW
				#undef THIS_FILE
				static char THIS_FILE[] = __FILE__;
				#endif
				
				/////////////////////////////////////////////////////////////////////////////
				// CEx2App
				
				BEGIN_MESSAGE_MAP(CEx2App, CWinApp)
					//{{AFX_MSG_MAP(CEx2App)
						// NOTE - the ClassWizard will add and remove mapping macros here.
						//    DO NOT EDIT what you see in these blocks of generated code!
					//}}AFX_MSG
					ON_COMMAND(ID_HELP, CWinApp::OnHelp)
				END_MESSAGE_MAP()
				
				/////////////////////////////////////////////////////////////////////////////
				// CEx2App construction
				
				CEx2App::CEx2App()
				{
					// TODO: add construction code here,
					// Place all significant initialization in InitInstance
				}
				
				/////////////////////////////////////////////////////////////////////////////
				// The one and only CEx2App object
				
				CEx2App theApp;
				
				/////////////////////////////////////////////////////////////////////////////
				// CEx2App initialization
				
				BOOL CEx2App::InitInstance()
				{
					AfxEnableControlContainer();
				
					// Standard initialization
					// If you are not using these features and wish to reduce the size
					//  of your final executable, you should remove from the following
					//  the specific initialization routines you do not need.
				
				#ifdef _AFXDLL
					Enable3dControls();			// Call this when using MFC in a shared DLL
				#else
					Enable3dControlsStatic();	// Call this when linking to MFC statically
				#endif
				
					CEx2Dlg dlg;
					m_pMainWnd = &dlg;
					int nResponse = dlg.DoModal();
					if (nResponse == IDOK)
					{
						// TODO: Place code here to handle when the dialog is
						//  dismissed with OK
					}
					else if (nResponse == IDCANCEL)
					{
						// TODO: Place code here to handle when the dialog is
						//  dismissed with Cancel
					}
				
					// Since the dialog has been closed, return FALSE so that we exit the
					//  application, rather than start the application's message pump.
					return FALSE;
				}