在VC中实现MSXML DOM应用的方法
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:
BSTRbstrText,bstrName;
inttype;
**)创建新文档
//hr=CoCreateInstance(CLSID_DOMDocument,NULL,CLSCTX_INPROC_SERVER,
//IID_IXMLDOMDocument,(void**)&m_pXMLDoc);
HRESULThr=CoCreateInstance(__uuidof(MSXML2::DOMDocument40),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
VARIANTvtype;
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//Createaprocessinginstructionelement.
BSTRbstrTarget=SysAllocString(L"xml");
BSTRbstrData=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
VARIANTv;
pEle->getAttribute(bstrName,&v);
CStringstr=v.bstrVal;
设置属性值
CComVariantv(str);
pEle->setAttribute(bstrName,v);
h)节点属性值
VARIANTv;
CStringstr;
longmCount;
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);
longmCount;
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
VARIANTv;
hr=pNod->get_nodevalue(&v);
j)XML文件操作
加载
VARIANT_BOOLstatus;
VARIANTvFileName;
(1)
pDoc->loadXML(bstrName,&status);
(2)
V_BSTR(&vFileName)=strFileName.AllocSysString();
V_VT(&vFileName)=VT_BSTR;
vResult=pDoc->load(vFileName,&status);
保存
BSTRpBFName=mFileName.AllocSysString();
CComVariantv(pBFName);
hr=pDoc->save(v);
BSTRbstr=NULL;
pDoc->get_xml(&bstr);
k)错误处理
BSTRbstr=NULL;
pDoc->get_parseError(&pObjError);
pObjError->get_reason(&bstr);
AfxMessageBox(_T("FailedtoloadDOMfrombooks.xml.%S/n"),*bstr);
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现在XML文档应用的方面特别的多.
我把以前写过的一个例子帖出来,以备以后使用.
第一部分:DOM解析:
概述:DOM解析将会把一个完整的XML文档读进来,生成一个结构树。这样会要把XML文档全部都加载到内在中。所以解析起来的速度会要慢一些。
1、如何加载xml文件:
//创建DOM,加载XML文档
MSXML::IXMLDOMDocumentPtr pCommandDoc;
pCommandDoc.CreateInstance(__uuidof(MSXML::DOMDocument));
pCommandDoc->put_async(VARIANT_FALSE);
pCommandDoc->put_validateOnParse(VARIANT_FALSE);
pCommandDoc->put_resolveExternals(VARIANT_FALSE);
pCommandDoc->put_preserveWhiteSpace(VARIANT_TRUE);
pCommandDoc->load(file.GetBuffer(0));
2、在XML文档中查找指定的结点:
//找到
MSXML::IXMLDOMNodePtr pRootNode=pCommandDoc->selectSingleNode("root/record");
if (pRootNode==NULL)
{
return ;
}
3、得到XML文档中,结点的属性
CString strTemp;
MSXML::IXMLDOMNamedNodeMapPtr pAttrs = NULL;
pRootNode->get_attributes(&pAttrs);
if (pAttrs==NULL)
{
return;
}
MSXML::IXMLDOMNodePtr pRequestTypeAttr=pAttrs->getQualifiedItem("name","");
_bstr_t strRequestType=pRequestTypeAttr->Gettext();
strTemp=strRequestType.operator char *();
4、得到结点的内容
_bstr_t strVisiPort=pNode->Gettext();
5、设置结点的内容
HRESULT hr=pNode->put_text(_bstr_t(m_strGatewayPassword));
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