#include <afxwin.h>

class CMyWnd:public CFrameWnd

{

private:

       char *ShowText;

public:

       afx_msg void OnPaint();

       afx_msg void OnLButtonDown();

       DECLARE_MESSAGE_MAP();

};

BEGIN_MESSAGE_MAP(CMyWnd,CFrameWnd)

    ON_WM_PAINT()

    ON_WM_LBUTTONDOWN()

END_MESSAGE_MAP()

void CMyWnd::OnPaint(){

       CPaintDC dc(this);

       dc.TextOut(20,20,ShowText);

}

void CMyWnd::OnLButtonDown(){

       ShowText="有消息映射表的程序！";

       InvalidateRect(0,TRUE);

}

class CMyApp:public CWinApp

{

public:

       BOOL InitInstance();

};

BOOL CMyApp::InitInstance(){

       CMyWnd *pMainWnd=new CMyWnd;

       pMainWnd->Create(0,"MFC");

       pMainWnd->ShowWindow(m_nCmdShow);

       pMainWnd->UpdateWindow();

       m_pMainWnd=pMainWnd;

       return true;

}

CMyApp MyApp;