HANDLE hFind;
bool FindFlag=false;

    hFind = FindFirstFile(FileName , &FindFileData);

    if (hFind == INVALID_HANDLE_VALUE) {
      FindFlag= false;
 }
    else
 {
      FindFlag=true;
 }
  FindClose(hFind);
  return FindFlag;
}

DWORD  dwFlag = GetFileAttributes(pathname);
 if ( 0xFFFFFFFF == dwFlag ) 不存在；
 if (  FILE_ATTRIBUTE_DIRECTORY & dwFlag ) 是文件夹
 else 是文件

  IOleContainer* pContainer;

   // Get the container
   HRESULT hr = pHtmlDoc2->QueryInterface(IID_IOleContainer,
                                       (void**)&pContainer);
   lpDisp->Release();

   if (FAILED(hr))
      return hr;

   IEnumUnknown* pEnumerator;

   // Get an enumerator for the frames
   hr = pContainer->EnumObjects(OLECONTF_EMBEDDINGS, &pEnumerator);
   pContainer->Release();

   if (FAILED(hr))
      return hr;

   IUnknown* pUnk;