MFC操作XML（转载）

MFC
MFC里可以直接使用DOM，不需要手动添加额外的头文件，只需要在CWinApp::InitInstance()里调用CoInitialize(NULL)初始化COM，在CWinApp::ExitInstance里调用CoUninitialize()释放COM就行了。

//读取XML
CComPtr <IXMLDOMDocument > spDoc ; //DOM
spDoc. CoCreateInstance (CLSID_DOMDocument ) ;
VARIANT_BOOL vb ;
spDoc - >load (CComVariant (OLESTR ( "xmlfile.xml" ) ), &vb ) ; //加载XML文件
CComPtr <IXMLDOMElement > spRootEle ;
spDoc - >get_documentElement ( &spRootEle ) ; //根节点
CComPtr <IXMLDOMNodeList > spNodeList ;
spRootEle - >get_childNodes ( &spNodeList ) ; //子节点列表
long nLen ;
spNodeList - >get_length ( &nLen ) ; //子节点数
for ( long i = 0 ; i ! = nLen ; ++i ) //遍历子节点
{
CComPtr <IXMLDOMNode > spNode ;
spNodeList - >get_item (i, &spNode ) ;
ProcessNode (spNode ) ; //节点处理函数
}

//写入XML
CComPtr <IXMLDOMNode > spNode ;
spRootEle - >selectSingleNode (OLESTR ( "/root/node1" ), &spNode ) ;
spNode - >put_text (OLESTR ( "newText" ) ) ; //写入text
spRootEle - >selectSingleNode (OLESTR ( "/root/node2/childnode1/@attrib1" ), &spNode ) ;
spNode - >put_nodeValue (CComVariant (OLESTR ( "newValue" ) ) ) ; //写入value
CComPtr <IXMLDOMNode > spNewNode ;
spDoc - >createNode (CComVariant (NODE_ELEMENT ), OLESTR ( "childnode3" ), OLESTR ( "" ), &spNewNode ) ; //创建新节点
spRootEle - >selectSingleNode (OLESTR ( "/root/node2" ), &spNode ) ;
spNode - >appendChild (spNewNode, &spNewNode ) ; //将新节点加为node2的子节点
spNewNode - >put_text (OLESTR ( "childtext2" ) ) ; //写入新节点text
CComQIPtr <IXMLDOMElement > spEle = spNewNode ; //注意这里使用CComQIPtr
spEle - >setAttribute (OLESTR ( "attrib1" ), CComVariant (OLESTR ( "value1" ) ) ) ; //给新节点添加属性
spDoc - >save (CComVariant (OLESTR ( "stocks.xml" ) ) ) ;

//节点处理函数
void ProcessNode (CComPtr <IXMLDOMNode > & spNode )
{
CComBSTR bsNodeName ;
spNode - >get_nodeName ( &bsNodeName ) ; //节点名
AfxMessageBox (COLE2CT (bsNodeName ) ) ;
CComVariant varVal ;
spNode - >get_nodeValue ( &varVal ) ; //节点值
AfxMessageBox (COLE2CT (varVal. bstrVal ) ) ;

DOMNodeType eNodeType ;
spNode - >get_nodeType ( &eNodeType ) ;
if (eNodeType == NODE_ELEMENT ) //只有NODE_ELEMENT类型才能包含有属性和子节点
{
//递归遍历节点属性
CComPtr <IXMLDOMNamedNodeMap > spNameNodeMap ;
spNode - >get_attributes ( &spNameNodeMap ) ;
long nLength ;
spNameNodeMap - >get_length ( &nLength ) ;
for ( long i = 0 ; i ! = nLength ; ++i )
{
CComPtr <IXMLDOMNode > spNodeAttrib ; //注意属性也是一个IXMLDOMNode
spNameNodeMap - >get_item (i, &spNodeAttrib ) ;
ProcessNode (spNodeAttrib ) ;
}

//递归遍历子节点
CComPtr <IXMLDOMNodeList > spNodeList ;
spNode - >get_childNodes ( &spNodeList ) ;
spNodeList - >get_length ( &nLength ) ;
for ( long i = 0 ; i ! = nLength ; ++i )
{
CComPtr <IXMLDOMNode > spChildNode ;
spNodeList - >get_item (i, &spChildNode ) ;
ProcessNode (spChildNode ) ;
}
}
}

转载于:https://www.cnblogs.com/zhulovefan/archive/2012/11/26/2788697.html