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在VC中应用MSXML DOM 的一些基本实现方法
头文件：
#import "C:\\WINDOWS\\system32\\msxml2.dll"
已知变量
MSXML2::IXMLDOMDocument *pDoc;
MSXML2::IXMLDOMNode *pChild, *pParent;
MSXML2::IXMLDOMNode *pNod;
MSXML2::IXMLDOMElement *pEle;
初始化指针：
MSXML2::IXMLDOMDocument *pDocument=NULL;
MSXML2::IXMLDOMNodeList *pNodeList=NULL;
MSXML2::IXMLDOMNamedNodeMap *pNodeMap=NULL;
MSXML2::IXMLDOMNode *pNode=NULL
MSXML2::IXMLDOMText *pText=NULL;
MSXML2::IXMLDOMElement *pElement=NULL;
MSXML2::IXMLDOMProcessingInstruction *pProcessingInstruction=NULL;
MSXML2::IXMLDOMComment *pComment=NULL;
MSXML2::IXMLDOMParseError *pObjError = NULL;
已知数据：
BSTR bstrText, bstrName;
int type;
**）创建新文档
// hr = CoCreateInstance(CLSID_DOMDocument, NULL, CLSCTX_INPROC_SERVER, IID_IXMLDOMDocument,(void**)&m_pXMLDoc);
HRESULT hr=CoCreateInstance(__uuidof(MSXML2::DOMDocument),NULL,CLSCTX_INPROC_SERVER, __uuidof(MSXML2::IXMLDOMDocument),(void**)&m_pXMLDoc);
hr = pDocument->put_async(VARIANT_FALSE);
hr = pDocument->put_validateOnParse(VARIANT_FALSE);
hr = pDocument->put_resolveExternals(VARIANT_FALSE);
a)添加子节点到父节点
pParent->appendChild(pChild, &pNode)
b)创建节点
VARIANT vtype;
vtype.vt = VT_I4;
V_I4(&vtype) = (int)type;
pDoc->createNode(vtype, bstrName, NULL, &pNode);
c)创建元素节点
pDoc->createElement(bstrName,pElement);
(pElement)->put_text(bstrText);
d)创建文本子节点，并添加到父节点中
pDoc->createTextNode(bstrText,&pText);
pParent->appendChild(pText,& pNode)
e）创建// Create a processing instruction element.
BSTR bstrTarget = SysAllocString(L"xml");
BSTR bstrData = SysAllocString(L"version='1.0'");
pDoc ->createProcessingInstruction(bstrTarget, bstrData, &pProcessingInstruction);
SysFreeString(bstrTarget);
SysFreeString(bstrData);
f)创建注释节点
pDoc->createComment(bstrText, &pComment);
g)元素节点属性值
得到属性值
VARIANT v;
pEle->getAttribute(bstrName,&v);
CString str = v.bstrVal;
设置属性值
CComVariant v(str);
pEle->setAttribute(bstrName, v);
h)节点属性值
VARIANT v;
CString str;
long mCount;
得到节点属性集
hr=pNod->get_attributes(&pNodeMap);
hr=pNodeMap->get_length(&mCount);
得到节点属性
hr=pNodeMap->getNamedItem(bstrName,&pNode);
pNodeMap->get_item(i,&pNode);
得到节点属性值
hr=pNode->get_nodevalue(&v);
str =v.bstrVal;
删除节点属性
MSXML2::IXMLDOMNode *moldNode;
mNodeMape->removeNamedItem(bstrName,&moldNode);
if (moldNode!=NULL) moldNode->Release();
i)节点
（1）得到节点、节点集
根据节点名称
pDoc->getElementsByTagName(bstrName,&pNodeList);
pNodeList->get_item(0,&pNode);
得到子节点集
hr=pNod->get_childNodes(&mNodeList);
long mCount;
MSXML2::IXMLDOMNode *pNodeSub;
mNodeList->get_length(&mCount);
hr=pNode->get_firstChild(&pNodeSub);
删除子节点（包含删除节点属性、子节点、当前节点）
删除当前子节点
pNodeList->get_item(i,&pNode);
pNod->removeChild(pNode,&moldNode);
moldNode->Release();
（2）根据节点得到节点名称
pNod->get_nodeName(&bstrName);
（3）根据节点得到节点值
VARIANT v;
hr=pNod->get_nodevalue(&v);
j)XML文件操作
加载
VARIANT_BOOL status;
VARIANT vFileName;
（1）
pDoc->loadXML(bstrName,&status);
（2）
V_BSTR(&vFileName) = strFileName.AllocSysString();
V_VT(&vFileName) = VT_BSTR;
vResult = pDoc->load(vFileName,&status);
保存
BSTR pBFName = mFileName.AllocSysString();
CComVariant v(pBFName);
hr=pDoc->save(v);
BSTR bstr = NULL;
pDoc->get_xml(&bstr);
k)错误处理
BSTR bstr = NULL;
pDoc->get_parseError(&pObjError);
pObjError->get_reason(&bstr);
AfxMessageBox(_T("Failed to load DOM from books.xml. %S\n"),*bstr);
写xml
MSXML2::IXMLDOMDocument *m_pXMLDoc;
HRESULT hr=CoCreateInstance(__uuidof(MSXML2::DOMDocument),NULL,CLSCTX_INPROC_SERVER,__uuidof(MSXML2::IXMLDOMDocument),(void**)&m_pXMLDoc);
if(m_pXMLDoc!=NULL)
{
hr = m_pXMLDoc->put_async(VARIANT_FALSE);
hr = m_pXMLDoc->put_validateOnParse(VARIANT_FALSE);
hr = m_pXMLDoc->put_resolveExternals(VARIANT_FALSE);
MSXML2::IXMLDOMProcessingInstructionPtr piPtr = m_pXMLDoc->createProcessingInstruction(L"xml",L"version='1.0' encoding='gb2312' standalone='yes'");
m_pXMLDoc->appendChild(piPtr);
MSXML2::IXMLDOMElementPtr rootPtr = m_pXMLDoc->createElement(L"root");
m_pXMLDoc->appendChild(rootPtr);
MSXML2::IXMLDOMElementPtr dataPtr = m_pXMLDoc->createElement(L"data");
rootPtr->appendChild(dataPtr);
dataPtr->put_text(L"12345");
dataPtr->setAttribute(L"name", L"kkk" );
BSTR bstrPath = SysAllocString(L"e:\\1.xml");
VARIANT vPath;
vPath.vt = VT_BSTR;
vPath.bstrVal = bstrPath;
m_pXMLDoc->save(vPath);
m_pXMLDoc->Release();
}
读xml
MSXML2::IXMLDOMDocument *m_pXMLDoc;
HRESULT hr=CoCreateInstance(__uuidof(MSXML2::DOMDocument),NULL,CLSCTX_INPROC_SERVER,__uuidof(MSXML2::IXMLDOMDocument),(void**)&m_pXMLDoc);
if(m_pXMLDoc!=NULL)
{
hr = m_pXMLDoc->put_async(VARIANT_FALSE);
hr = m_pXMLDoc->put_validateOnParse(VARIANT_FALSE);
hr = m_pXMLDoc->put_resolveExternals(VARIANT_FALSE);
BSTR bstrPath = SysAllocString(L"e:\\1.xml");
VARIANT vPath;
vPath.vt = VT_BSTR;
vPath.bstrVal = bstrPath;
m_pXMLDoc->load(vPath);
MSXML2::IXMLDOMElement* root;
m_pXMLDoc->get_documentElement(&root);
MSXML2::IXMLDOMNodeList* xmlChildNodes = NULL;
root->get_childNodes(&xmlChildNodes);
long xmlChildNodesCount = 0;
xmlChildNodes->get_length(&xmlChildNodesCount);
if(xmlChildNodesCount>0)
{
MSXML2::IXMLDOMNode* currentNode = NULL;
xmlChildNodes->get_item(0,¤tNode);
BSTR nodeName;
currentNode->get_nodeName(&nodeName);
MessageBox(nodeName);
BSTR nodeText;
currentNode->get_text(&nodeText);
MessageBox(nodeText);
MSXML2::IXMLDOMNamedNodeMap *attributeMap = NULL;
currentNode->get_attributes(&attributeMap);
long mCount = 0;
attributeMap->get_length(&mCount);
if(mCount>0)
{
MSXML2::IXMLDOMNode* pNode = NULL;
attributeMap->get_item(0,&pNode);
VARIANT v;
pNode->get_nodeValue(&v);
MessageBox(v.bstrVal);
}
}
m_pXMLDoc->Release();
}
