Re: shared DLL VS static Link, Are they different?

hi, everyone, I meet a strange problem:
I'm using VC6 and create a dialog based applications. And I want to add
a third part library( Open computer library--OpenCV AS DLL). I linked
with the cxcored.lib. My APP will call functions in cxcore001d.dll.

I only add two functions in the OnInitDialog function:
/////////////////////////////////////////////////////////////////
BOOL COpenCVdialogDlg::OnInitDialog()
{
    ......
    m_iplImage = cvCreateImage(ImgSize,IPL_DEPTH_8U,IMAGE_CHANNELS);
    cvReleaseImage(&m_iplImage);
    ......
}
////////////////////////////////////////////////////////////////
In the code above, I only create an Image and release it quickly, which
seems I do Nothing. ^_^ ,The two functions are exported from
cxcore100d.dll( associated with cxcored.lib)

Here comes my problem. When I build the APP with static MFC library, the
program works fine. But When I build the APP with "Using MFC as shared
DLL" option, there are many memory leak report when I exit the APP.

It is very strange that "using MFC as shared DLL" and "using MFC as a
static library" are much different? Otherwise, There are something wrong
 with the source code generating cxcore100d.dll?

By the way, OpenCV is an open source library,so, I have the full source
code of "cxcore100d.dll" , I examine the code and can't find anything
wrong.
Here is its DLL Main entry:
////////////////////////////////////////////////////////////////
#if defined WIN32 || defined WIN64
BOOL WINAPI DllMain( HINSTANCE, DWORD fdwReason, LPVOID )
{
    CvContext *pContext;

    switch (fdwReason)
    {
    case DLL_PROCESS_ATTACH:
        g_TlsIndex = TlsAlloc();
        if( g_TlsIndex == TLS_OUT_OF_INDEXES ) return FALSE;
        //break;

    case DLL_THREAD_ATTACH:
        pContext = icvCreateContext();
        if( pContext == NULL)
            return FALSE;
        TlsSetValue( g_TlsIndex, (LPVOID)pContext );
        break;

    case DLL_THREAD_DETACH:
        if( g_TlsIndex != TLS_OUT_OF_INDEXES )
        {
            pContext = (CvContext*)TlsGetValue( g_TlsIndex );
            if( pContext != NULL )
                icvDestroyContext( pContext );
        }
        break;

    case DLL_PROCESS_DETACH:
        if( g_TlsIndex != TLS_OUT_OF_INDEXES )
        {
            pContext = (CvContext*)TlsGetValue( g_TlsIndex );
            if( pContext != NULL )
                icvDestroyContext( pContext );
        }
        TlsFree( g_TlsIndex );
        break;
    default:
        ;
    }
    return TRUE;
}
////////////////////////////////////////////////////////////////
I was confused that why the "break" statement is commented after the
"case DLL_PROCESS_ATTACH:"?

Further more, the cvCreateImage and cvReleaseImage function in my APP is
  regularly simple, they only allocate a piece of memory and delete it.

Thanks for reading my Post!