用IShellDispatch 接口 获得文件的摘要信息

IShellDispatch* pShellDisp = NULL;
    Folder *pFolder;
    FolderItem *pFolderItem;
    CComBSTR    stitle,str;
    HRESULT hr = S_OK;

    CoInitialize(NULL);

    hr =  ::CoCreateInstance( CLSID_Shell, NULL, 
        CLSCTX_SERVER, IID_IShellDispatch, (LPVOID*)&pShellDisp );

    if( hr == S_OK )
    {
        hr = pShellDisp->NameSpace(CComVariant(_T("E://a")),&pFolder);  
        hr = pFolder->ParseName(CComBSTR(_T("a.mp3")),&pFolderItem);
        CComVariant vItem(pFolderItem);
        CComVariant vEmpty;
        int i = 0;
        char *ac = NULL;
        for (int i = 0 ;i < 100;i++)
        {
            hr = pFolder->GetDetailsOf(vEmpty,i,&stitle);
            hr = pFolder->GetDetailsOf(vItem,i,&str);
            COLE2T lpszTitle(stitle);
            COLE2T lpszInfo(str);
            TCHAR buf[300];
            _stprintf(buf,_T("%s:%s"),lpszTitle.m_psz,lpszInfo.m_psz);
            int a = 1;
        }
        hr = pShellDisp->Release();
        pShellDisp = NULL;
    }
    CoUninitialize();