以下代码是关于用类CmdiMainClient来显示动画背景旗帜的一个例子。原理是很简单的，我们只需要一系列连续的位图，并且让它连续显示。在这个例子中你可以用鼠标的右键来开始/停止这个动画，如果点左键的话，就可以显示一个子窗口，来保持动画是继续。为了你的方便，你可以把代码直接从浏览器中拷贝下去，并且插到你的代码中就行了。以下是代码：


#include "stdafx.h"
#include "banner.h"
#include "mainfrm.h"

#include "resource.h"

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMdiMainClient

CMdiMainClient::CMdiMainClient()
: m_sizeClient(0, 0)

{
VERIFY (m_bmpBackGround.LoadBitmap(IDB_BCKGRD));
ASSERT (m_bmpBackGround.GetSafeHandle());

VERIFY (m_bmpBackGround2.LoadBitmap(IDB_BITMAP0));
ASSERT (m_bmpBackGround2.GetSafeHandle());

BmpLoaded = 1;
StopRotation = FALSE;
}

CMdiMainClient::~CMdiMainClient()
{
if(m_bmpBackGround.GetSafeHandle())
m_bmpBackGround.DeleteObject();

if(m_bmpBackGround2.GetSafeHandle())
m_bmpBackGround2.DeleteObject();
}


BEGIN_MESSAGE_MAP(CMdiMainClient, CWnd)
//{{AFX_MSG_MAP(CMdiMainClient)
// NOTE - the ClassWizard will add and remove mapping macros here.
ON_WM_TIMER()
ON_WM_ERASEBKGND()
ON_WM_RBUTTONDOWN()
ON_WM_LBUTTONDOWN()
ON_WM_SIZE()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()


/////////////////////////////////////////////////////////////////////////////
// CMdiMainClient message handlers
BOOL CMdiMainClient::OnEraseBkgnd(CDC* pDC)
{
// Erase only the area needed
CRect rect;
GetClientRect(&rect) ;

SetTimer(0,300,NULL);

// Place the bitmap
BITMAP bm ;
CDC dcMem ;

BITMAP bm2 ;
CDC dcMem2;


VERIFY(m_bmpBackGround.GetObject(sizeof(bm), (LPVOID)&bm));
dcMem.CreateCompatibleDC(NULL);
CBitmap* pbmpOld = (CBitmap*)dcMem.SelectObject(&m_bmpBackGround);
ASSERT(pbmpOld) ;
// Display red background
pDC->StretchBlt(0, 0, rect.right, rect.bottom, &dcMem, 0,
0, bm.bmWidth, bm.bmHeight,SRCCOPY);

VERIFY(m_bmpBackGround2.GetObject(sizeof(bm2), (LPVOID)&bm2));
dcMem2.CreateCompatibleDC(NULL);
dcMem2.SelectObject(&m_bmpBackGround2);
// Display picture background
pDC->StretchBlt(200,100,400, 200, &dcMem2, 0,0, bm2.bmWidth, bm2.bmHeight,
SRCCOPY);

// Display Instructions
pDC->SetBkColor(RGB(255,0,0));
pDC->SetTextColor(RGB(192,192,192));
pDC->TextOut(480, 500, "Mouse Right Click to Stop/Start Special Effects");
pDC->TextOut(480, 515, "Mouse Left-Click to Show Child Window");

// CleanUp
dcMem.SelectObject(pbmpOld) ;

return TRUE;
}

////////////////////////////////////////////////////////////////////
//
void CMdiMainClient::OnSize(UINT nType, int cx, int cy)
{
Default() ;
// if the app is just starting up, save the window
// dimensions and get out

if ((m_sizeClient.cx == 0) && (m_sizeClient.cy==0))
{
m_sizeClient.cx = cx;
m_sizeClient.cy = cy;

return ;
}

// if the size hasn't changed, break and pass to default

if ((m_sizeClient.cx == cx) && ( m_sizeClient.cy == cy))
{
return ;
}

// window size has changed so save new dimensions and force
// entire background to redraw, including icon backgrounds

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