"Reading xml file"

我正在加载和读取xml文件。当我使用Visual studio 6时，我是成功的，但现在我已经更改为Visual studio 10，并且无法编译。

我正在使用MFC类开发SDI应用程序。

错误如下:

1. 错误1120 -，一个未解决的外部
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2. 未处理异常/gh>

CComPtr<IXMLDOMElement> iRootElm;
    ::CoInitialize(NULL);
    HRESULT hr = m_plDomDocument.CreateInstance(__uuidof(DOMDocument));
    if (FAILED(hr))
    {
        _com_error er(hr);
        AfxMessageBox(er.ErrorMessage());
        //EndDialog(1);
    }

    CString strFileName ("TestCase.xml");
    // convert xml file name string to something COM can handle (BSTR)
    //fname = strFileName;
    _bstr_t bstrFileName;
    VARIANT_BOOL *flag = NULL;
    bstrFileName = fname.AllocSysString();
    _variant_t source;
    source.vt = VT_BSTR;
    source.bstrVal = bstrFileName;
    //VARIANT source = (VARIANT)fname;

    // call the IXMLDOMDocumentPtr's load function to load the XML document
    variant_t vResult;
    //vResult = ;
    vResult = m_plDomDocument->load(source , flag);
    bool v = (bool)vResult;
    if ((bool)vResult == true) // success!
    {
        // now that the document is loaded, we need to initialize the root pointer
        //m_pDocRoot = m_plDomDocument->createElement((_bstr_t)"TestCase" , temp); // ->documentElement;
        m_pDocRoot = m_plDomDocument->get_documentElement(&iRootElm);
        //m_pDocRoot = m_plDomDocument->createElement((_bstr_t)"TestCase.cml" );
        AfxMessageBox(_T("Document loaded successfully!"));
        //AfxMessageBox(m_plDomDocument);
    }
    else
    {
        AfxMessageBox(_T("Document FAILED to load!"));  
    }
}