::CoInitialize(NULL);    CComPtr<MSXML2::IXMLDOMDocument> spDoc;
    HRESULT hr = spDoc.CoCreateInstance(__uuidof(MSXML2::DOMDocument));    //创建文档对象
    spDoc->put_async(TRUE);
    VARIANT_BOOL bFlag;
    hr = spDoc->load(CComVariant(L"BitComet.xml"), &bFlag);               //load xml文件
为什么load的返回值是S_FALSE呢?