关于使用MSXML解析XML文件的问题

超级无敌咕咕鸡 2008-05-04 02:15:48

XML文件如下：
<?xml version="1.0" encoding="utf-8"?>
<ack_id_info>
<errno>success</errno>

<user>192.168.10.119</user>
<group>a</group>
<role>c</role>

<user>192.168.10.129</user>
<group>a</group>
<role>c</role>

<user>192.168.10.139</user>
<group>b</group>
<role>d</role>

<user>192.168.10.149</user>
<group>b</group>
<role>d</role>

</ack_id_info>
功能函数代码如下：



int Resolve_XML(ACK_INFO_TYPE_E type)

{

	CoInitialize(NULL);

	CComPtr<IXMLDOMDocument> spXMLDOM;   

	HRESULT hr = spXMLDOM.CoCreateInstance(__uuidof(DOMDocument));   

	if ( FAILED(hr)){

		throw "不能创建XML Parser对象"; 

		return -1;

	}

	if ( spXMLDOM.p == NULL ) {

		throw "不能创建XML Parser对象";

		return -1;

	}

// 如果对象创建成功的话，就开始装载XML文档   

	VARIANT_BOOL bSuccess = false;   

	hr = spXMLDOM->load(CComVariant(path),&bSuccess);   

	if ( FAILED(hr) )

	{

		throw "不能够在解析器中装载XML文档";

		return -1;

	}

	if ( !bSuccess )

	{

		throw "不能够在解析器中装载XML文档";

		return -1;

	}

	CComBSTR bstrSS(L"errno");   

	CComPtr<IXMLDOMNode> spXMLNode; 

//用接口IXMLDOMDocument的方法selectSingleNode方法定位该节点   

	hr = spXMLDOM->selectSingleNode(bstrSS,&spXMLNode);   

	if ( FAILED(hr) )

	{

		throw "不能在XML节点中定位'errno' ";

		return -1;

	}

	if ( spXMLNode.p == NULL )

	{

		throw "不能在XML节点中定位'errno' ";

		return -1;

	}

	// 得到该节点包含的文本并显示它   

	CComVariant varValue(VT_EMPTY);   

	hr = spXMLNode->get_nodeTypedValue(&varValue);   

	if ( FAILED(hr) )

	{

		throw "不能提取'errno'文本";

		return -1;

	}

	if ( varValue.vt == VT_BSTR ){   

		// 显示结果，注意这里要把字符串从形式BSTR转化为ANSI   

		USES_CONVERSION;   

		LPTSTR lpstrMsg = W2T(varValue.bstrVal);   



		if((LPTSTR)"success" == lpstrMsg)//这里可能会有问题

		{

			spXMLNode = NULL; // 释放先前的节点   

			CComPtr<IXMLDOMNodeList> spXMLNodeList; 

			long   length;

			spXMLNodeList->get_length(&length);

			for(long i = 0; i < length; i++)   

			{   

				CComPtr<IXMLDOMNode>   spNode;   

				CComQIPtr<IXMLDOMElement>   spVoice;   

				spXMLNodeList->get_item(i,   &spNode);   

				spVoice   =   spNode;   

				if   (spVoice)   

				{   

					CComBSTR   data;   

					CComVariant   val;   

					spVoice->getAttribute(attrRef,   &val);   

				}   

			}



			return 0;

		}

		else

		{

			throw "文档errno节点值为failed";

			return -1;

		}

	}else {   

		// 如果出现错误   

		throw "不能提取'errno'文本";

		return -1;

	} 



	return 0;

}