MsXml创建和解析XML示例

骑猪看日落 2022-06-15 12:08 226阅读 0赞

一．MsXml创建XML文档示例

// XmlCreationDemo.cpp
    
    #include <stdlib.h>
    #include <stdio.h>
    
    // 引入MSXML解析器
    #import <msxml4.dll>
    using namespace MSXML2;
    
    class InitializeCom
    {
    public:
    	InitializeCom()	{		CoInitialize(NULL); // Initializes the COM library	}
    	~InitializeCom() {		CoUninitialize(); // Closes the COM library	}
    }InitCom;
    
    int main()
    {
    	char *szXmlFile = "D://china.xml"; // xml文件
    	IXMLDOMDocumentPtr pDoc = NULL; // xml文档
    	IXMLDOMProcessingInstructionPtr pProInstruction = NULL; // xml声明
    	IXMLDOMCommentPtr pComment = NULL; // 注释
    	IXMLDOMElementPtr pRootElement = NULL, pElement = NULL; // 根节点(元素)
    	IXMLDOMNodePtr pNode = NULL, pNode1 = NULL, pNode2 = NULL; // 节点
    	IXMLDOMAttributePtr pAttrNode = NULL; // 属性
    
    	HRESULT hr = pDoc.CreateInstance(__uuidof(DOMDocument40)); //
    	if (FAILED(hr))
    	{
    		printf("无法创建DOMDocument40对象，请检查是否安装并初始化了MsXml Parser库！");
    		return EXIT_FAILURE;
    	}
    	
    	// (1)创建xml文档声明(或insertBefore根节点)
    	pProInstruction = pDoc->createProcessingInstruction((_bstr_t)(char*)"xml", (_bstr_t)(char*)"version=/"1.0/" encoding=/"utf-8/""); 
    	pDoc->appendChild((IXMLDOMNode*)pProInstruction);
    
    	// (2)创建根节点<China>
    	pRootElement =  pDoc->createElement((_bstr_t)(char*)"China");	
    	pDoc->PutRefdocumentElement(pRootElement); // pXMLDomDoc->documentElement = pRootElement;
    
    	// (3)创建节点<China><Continent>	
    	pComment = pDoc->createComment((_bstr_t)(char*)"所在的洲");
    	pRootElement->appendChild((IXMLDOMNode*)pComment); // 注释
    	
    	pNode = pDoc->createNode((_variant_t)(long)NODE_ELEMENT, (_bstr_t)(char*)"Continent", (_bstr_t)(char*)"");
    	pNode->Puttext((_bstr_t)(char*)"Asia"); // pNode->text = "Asia";
    	pRootElement->appendChild(pNode); // 节点
    
    	// (4)创建节点<China><Population>
    	pComment = pDoc->createComment((_bstr_t)(char*)"人口数量");
    	pRootElement->appendChild((IXMLDOMNode*)pComment); // 注释
    
    	pElement = pDoc->createElement((_bstr_t)(char*)"Population");
    	pAttrNode = pDoc->createAttribute((_bstr_t)(char*)"Units");
    	pAttrNode->Puttext((_bstr_t)(char*)"Million Person");
    	pElement->setAttributeNode(pAttrNode); // 统计单位
    	pElement->setAttribute((_bstr_t)(char*)"StatisticalYear", (_variant_t)(char*)"2000"); // 统计年份
    	pElement->Puttext((_bstr_t)(char*)"1,296");
    	pRootElement->appendChild(pElement); // 节点
    
    	// (5)创建节点<China><Municipality>
    	pComment = pDoc->createComment((_bstr_t)(char*)"四个直辖市");
    	pRootElement->appendChild((IXMLDOMNode*)pComment); // 注释
    
    	pNode = pDoc->createNode((_variant_t)(long)NODE_ELEMENT, (_bstr_t)(char*)"Municipality", (_bstr_t)(char*)"");
    	pRootElement->appendChild(pNode); // 节点
    
    	// (6)创建节点<China><Municipality><TianJin>
    	pNode1 = pDoc->createNode((_variant_t)(long)NODE_ELEMENT, (_bstr_t)(char*)"TianJin", (_bstr_t)(char*)"");
    	
    	//    创建节点<China><Municipality><TianJin><Area>
    	pElement = pDoc->createElement((_bstr_t)(char*)"Area");
    	pElement->setAttribute((_bstr_t)(char*)"Units", (_variant_t)(char*)"Thousand Square kilometers"); // 统计单位
    	pElement->Puttext((_bstr_t)(char*)"12");
    	pNode1->appendChild((IXMLDOMNode*)pElement); // 节点
    	
    	//    创建节点<China><Municipality><TianJin><Population>
    	pElement = pDoc->createElement((_bstr_t)(char*)"Population");
    	pElement->setAttribute((_bstr_t)(char*)"Units", (_variant_t)(char*)"Million Person"); // 统计单位
    	pElement->setAttribute((_bstr_t)(char*)"StatisticalYear", (_variant_t)(char*)"2000"); // 统计年份
    	pElement->Puttext((_bstr_t)(char*)"10.01");
    	pNode1->appendChild((IXMLDOMNode*)pElement); // 节点
    
    	pNode->appendChild(pNode1);
    	// (7)创建节点<China><Municipality><BeiJing>并插入<TianJin>前
    	pNode2 = pDoc->createNode((_variant_t)(long)NODE_ELEMENT, (_bstr_t)(char*)"BeiJing", (_bstr_t)(char*)"");
    
    	//    创建节点<China><Municipality><BeiJing><Area>
    	pElement = pDoc->createElement((_bstr_t)(char*)"Area");
    	pElement->setAttribute((_bstr_t)(char*)"Units", (_variant_t)(char*)"Thousand Square kilometers"); // 统计单位
    	pElement->Puttext((_bstr_t)(char*)"17");
    	pNode2->appendChild((IXMLDOMNode*)pElement); // 节点
    	
    	//    创建节点<China><Municipality><BeiJing><Population>
    	pElement = pDoc->createElement((_bstr_t)(char*)"Population");
    	pElement->setAttribute((_bstr_t)(char*)"Units", (_variant_t)(char*)"Million Person"); // 统计单位
    	pElement->setAttribute((_bstr_t)(char*)"StatisticalYear", (_variant_t)(char*)"2000"); // 统计年份
    	pElement->Puttext((_bstr_t)(char*)"13.82");
    	pNode2->appendChild((IXMLDOMNode*)pElement); // 节点
    
    	pNode->insertBefore(pNode2, (_variant_t)(IDispatch*)pNode1);
    	//
    	// (8)创建节点<China><Municipality><ShangHai>
    	// (9)创建节点<China><Municipality><ChongQing>
    
    	pDoc->save((_variant_t)szXmlFile);
    
    	return EXIT_SUCCESS;
    }

生成的china.xml文档内容：

<?xml version="1.0" encoding="utf-8"?>
    <China>
    
      <Continent>Asia</Continent>
      
      <Population Units="Million Person" StatisticalYear="2000">1,296</Population>
      
      <Municipality>
        <BeiJing>
          <Area Units="Thousand Square kilometers">17</Area>
          <Population Units="Million Person" StatisticalYear="2000">13.82</Population>
        </BeiJing>
        <TianJin>
          <Area Units="Thousand Square kilometers">12</Area>
          <Population Units="Million Person" StatisticalYear="2000">10.01</Population>
        </TianJin>
        <ShangHai>
          <Area Units="Thousand Square kilometers">6.4</Area>
          <Population Units="Million Person" StatisticalYear="2000">16.74</Population>
        </ShangHai>
        <ChongQing>
          <Area Units="Thousand Square kilometers">84</Area>
          <Population Units="Million Person" StatisticalYear="2000">30.90</Population>
        </ChongQing>
      </Municipality>
    </China>

二．MsXml解析XML文档示例

// XmlParsingDemo.cpp
    
    #include <stdlib.h>
    #include <stdio.h>
    
    // 引入MSXML解析器
    #import <msxml4.dll>
    using namespace MSXML2;
    
    class InitializeCom
    {
    public:
    	InitializeCom()	{		CoInitialize(NULL); // Initializes the COM library	}
    	~InitializeCom() {		CoUninitialize(); // Closes the COM library	}
    }InitCom;
    
    int main()
    {
    	char *szXmlFile = "D://china.xml"; //上篇创建的xml文档
    	IXMLDOMDocumentPtr pDoc = NULL; // xml文档
    	IXMLDOMNodeListPtr pNodeList = NULL; // 节点链表
    	IXMLDOMElementPtr pRootElement = NULL, pElement = NULL; // 根节点(元素)
    	IXMLDOMNodePtr pNode = NULL, pNode1 = NULL; // 节点
    	IXMLDOMNamedNodeMapPtr pAttrList = NULL; // 属性链表
    	IXMLDOMAttributePtr pAttrNode = NULL; // 属性
    	long lChilds, lAttr, i;
    
    	HRESULT hr = pDoc.CreateInstance(__uuidof(DOMDocument40));
    	if (FAILED(hr))
    	{
    		printf("无法创建DOMDocument40对象，请检查是否安装并初始化了MsXml Parser库！");
    		return EXIT_FAILURE;
    	}
    
    	VARIANT_BOOL bXmlLoad = pDoc->load((_variant_t)szXmlFile);
    	if (!bXmlLoad) // 加载失败
    	{
    		printf("加载%s失败！/n", szXmlFile);
    		return EXIT_FAILURE;
    	}
        
    	// (1)根节点
    	pRootElement = pDoc->GetdocumentElement();
    	printf("root = %s/n", (char*)pRootElement->GetnodeName()); // pRootElement->nodeName
    
    	// (2)根节点的一级子节点
    	pNodeList = pRootElement->GetchildNodes(); // pRootElement->childNodes
    	lChilds = pNodeList->Getlength(); // pNodeList->length
    	for (i = 0; i < lChilds; i++)
    	{
    		pNode = pNodeList->Getitem(i); // pNodeList->item[i]
    		if (pNode->GetnodeType() != NODE_COMMENT) // 过滤注释节点
    		{
    			printf("child[%d] of [%s]: [%s]/n", i ,(char*)pRootElement->GetnodeName(), (char*)pNode->GetnodeName());
    		}
    	}
    
    	// (3)统计文档中所有的<Population>节点
    	pNodeList = pDoc->getElementsByTagName((_bstr_t)(char*)"Population");
    	lChilds = pNodeList->Getlength();
    	printf("文档中[Population]共有%d个/n", lChilds);
    
    	// (4)根节点下的<Population>节点
    	pNode = pRootElement->selectSingleNode((_bstr_t)(char*)"Population");
    	// 已知根节点为<China>时：pNode = pDoc->selectSingleNode((_bstr_t)(char*)"China//Population");
    	printf("根节点下的[Population]子节点值为%s/n", (char*)pNode->Gettext());
    	pAttrList = pNode->Getattributes();
    	lAttr = pAttrList->Getlength();
    	for (i = 0; i < lAttr; i++)
    	{
    		pAttrNode = pAttrList->Getitem(i);
    		printf("Attr[%d] of [%s]: %s = %s/n", i, (char*)pNode->GetnodeName(), (char*)pAttrNode->GetnodeName(), (char*)pAttrNode->Gettext());
    	}
    	
    	// (5)查找节点<Municipality>下的所有子节点
    	// "//"表示在任意一层寻找Municipality；"//*"查找<Municipality></Municipality>中的所有子节点
    	pNodeList = pDoc->selectNodes((_bstr_t)(char*)"//Municipality//*"); // 这里可将pDoc换成pRootElement
    	while (pNode = pNodeList->nextNode())
    	{
    		printf("childs of [Municipality]: %s/n", (char*)pNode->GetnodeName());
    	}
    
    	// (6)查找节点<Municipality>下的一级子节点
    	pNode = pRootElement->selectSingleNode((_bstr_t)(char*)"Municipality");
    	pNodeList = pNode->GetchildNodes();
    	lChilds = pNodeList->Getlength();
    	for (i = 0; i < lChilds; i++)
    	{
    		pNode1 = pNodeList->Getitem(i); // pNodeList->item[i]
    		printf("child[%d] of [Municipality]: %s/n", i, (char*)pNode1->GetnodeName());
    	}
    
    	// (7)查询父、子、兄、弟节点
    	pNode = pRootElement->selectSingleNode((_bstr_t)(char*)"//TianJin");
    	pNode1 = pNode->GetparentNode(); // 父节点
    	printf("[TianJin]的父节点为[%s]/n", (char*)pNode1->GetnodeName());
    
    	pNodeList = pNode->GetchildNodes(); // 子节点
    	lChilds = pNodeList->Getlength();
    	for (i = 0; i < lChilds; i++)
    	{
    		pNode1 = pNodeList->nextNode();
    		printf("child[%d] of [TianJin]: %s/n", i, (char*)pNode1->GetnodeName());
    	}
    
    	pNode1 = pNode->GetpreviousSibling(); // 兄节点
    	printf("[TianJin]的兄节点为[%s]/n", (char*)pNode1->GetnodeName());
    
    	pNode1 = pNode->GetnextSibling(); // 弟节点
    	printf("[TianJin]的弟节点为[%s]/n", (char*)pNode1->GetnodeName());
    
    	return EXIT_SUCCESS;
    }

**运行结果如下：**

root = China

child\[1\] of <China>: <Continent>

child\[3\] of <China>: <Population>

child\[5\] of <China>: <Municipality>

文档中<Population>共有5个

根节点下的<Population>子节点值为1,296

Attr\[0\] of <Population>: Units = Million Person

Attr\[1\] of <Population>: StatisticalYear = 2000

childs of <Municipality>: BeiJing

childs of <Municipality>: Area

childs of <Municipality>: Population