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HRESULT hr;
CComPtr<IXMLDOMDocument> pXmlDoc = NULL;
hr = ::CoInitializeEx(NULL, COINIT_MULTITHREADED);
hr = ::CoCreateInstance(CLSID_DOMDocument,
NULL,
CLSCTX_INPROC_SERVER | CLSCTX_LOCAL_SERVER,
IID_IXMLDOMDocument,(void**)&pXmlDoc);
VARIANT vFile;
vFile.vt = VT_BSTR ;
VARIANT_BOOL vBool;
vFile.bstrVal = SysAllocString(L"\\xmldemo.xml");//.XML文件名
//hr = S_OK;
hr = pXmlDoc->load(vFile,&vBool);//加载XML文件
VARIANT_BOOL FALSE = 0
VARIANT_BOOL TRUE = -1