MsXml建立和解析XML示例

一．MsXml建立XML文檔示例

// 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);	}
	~InitializeCom() {	CoUninitialize(); 	}
}InitCom;

int main()
{
		char *szXmlFile = "D://china.xml"; // xml文件
		MSXML2::IXMLDOMDocumentPtr pDoc = NULL; // xml文檔
		MSXML2::IXMLDOMProcessingInstructionPtr pProInstruction = NULL; // xml聲明
		MSXML2::IXMLDOMCommentPtr pComment = NULL; // 註釋
		MSXML2::IXMLDOMElementPtr pRootElement = NULL, pElement = NULL; // 根節點(元素)
		MSXML2::IXMLDOMNodePtr pNode = NULL, pNode1 = NULL, pNode2 = NULL; // 節點
		MSXML2::IXMLDOMAttributePtr pAttrNode = NULL; // 屬性

		HRESULT hr = pDoc.CreateInstance(__uuidof(MSXML2::DOMDocument40)); //
		if (FAILED(hr))
		{
			printf("沒法建立DOMDocument40對象，請檢查是否安裝並初始化了MsXml Parser庫！");
			return EXIT_FAILURE;
		}

		// (1)建立xml文檔聲明(或insertBefore根節點)
		pProInstruction = pDoc->createProcessingInstruction((_bstr_t)(char*)"xml", (_bstr_t)(char*)"version=\"1.0\" encoding=\"utf-8\""); 
		pDoc->appendChild((MSXML2::IXMLDOMNode*)pProInstruction);

		// (2)建立根節點<China>
		pRootElement =  pDoc->createElement((_bstr_t)(char*)"China");	
		pDoc->PutRefdocumentElement(pRootElement); // pXMLDomDoc->documentElement = pRootElement;

		// (3)建立節點<China><Continent>	
		pComment = pDoc->createComment((_bstr_t)(char*)"所在的洲");
		pRootElement->appendChild((MSXML2::IXMLDOMNode*)pComment); // 註釋

		pNode = pDoc->createNode((_variant_t)(long)MSXML2::NODE_ELEMENT, (_bstr_t)(char*)"Continent", (_bstr_t)(char*)"");
		pNode->Puttext((_bstr_t)(char*)"Asia"); // pNode->text = "Asia";
		pRootElement->appendChild(pNode); // 節點

		// (4)建立節點<China><Population>
		pComment = pDoc->createComment((_bstr_t)(char*)"人口數量");
		pRootElement->appendChild((MSXML2::IXMLDOMNode*)pComment); // 註釋

		pElement = pDoc->createElement((_bstr_t)(char*)"Population");
		pAttrNode = pDoc->createAttribute((_bstr_t)(char*)"Units");
		pAttrNode->Puttext((_bstr_t)(char*)"Million Person");
		pElement->setAttributeNode(pAttrNode); // 統計單位
		pElement->setAttribute((_bstr_t)(char*)"StatisticalYear", (_variant_t)(char*)"2000"); // 統計年份
		pElement->Puttext((_bstr_t)(char*)"1,296");
		pRootElement->appendChild(pElement); // 節點

		// (5)建立節點<China><Municipality>
		pComment = pDoc->createComment((_bstr_t)(char*)"四個直轄市");
		pRootElement->appendChild((MSXML2::IXMLDOMNode*)pComment); // 註釋

		pNode = pDoc->createNode((_variant_t)(long)MSXML2::NODE_ELEMENT, (_bstr_t)(char*)"Municipality", (_bstr_t)(char*)"");
		pRootElement->appendChild(pNode); // 節點

		// (6)建立節點<China><Municipality><TianJin>
		pNode1 = pDoc->createNode((_variant_t)(long)MSXML2::NODE_ELEMENT, (_bstr_t)(char*)"TianJin", (_bstr_t)(char*)"");

		//    建立節點<China><Municipality><TianJin><Area>
		pElement = pDoc->createElement((_bstr_t)(char*)"Area");
		pElement->setAttribute((_bstr_t)(char*)"Units", (_variant_t)(char*)"Thousand Square kilometers"); // 統計單位
		pElement->Puttext((_bstr_t)(char*)"12");
		pNode1->appendChild((MSXML2::IXMLDOMNode*)pElement); // 節點

		//    建立節點<China><Municipality><TianJin><Population>
		pElement = pDoc->createElement((_bstr_t)(char*)"Population");
		pElement->setAttribute((_bstr_t)(char*)"Units", (_variant_t)(char*)"Million Person"); // 統計單位
		pElement->setAttribute((_bstr_t)(char*)"StatisticalYear", (_variant_t)(char*)"2000"); // 統計年份
		pElement->Puttext((_bstr_t)(char*)"10.01");
		pNode1->appendChild((MSXML2::IXMLDOMNode*)pElement); // 節點

		pNode->appendChild(pNode1);
		// (7)建立節點<China><Municipality><BeiJing>並插入<TianJin>前
		pNode2 = pDoc->createNode((_variant_t)(long)MSXML2::NODE_ELEMENT, (_bstr_t)(char*)"BeiJing", (_bstr_t)(char*)"");

		//    建立節點<China><Municipality><BeiJing><Area>
		pElement = pDoc->createElement((_bstr_t)(char*)"Area");
		pElement->setAttribute((_bstr_t)(char*)"Units", (_variant_t)(char*)"Thousand Square kilometers"); // 統計單位
		pElement->Puttext((_bstr_t)(char*)"17");
		pNode2->appendChild((MSXML2::IXMLDOMNode*)pElement); // 節點

		//    建立節點<China><Municipality><BeiJing><Population>
		pElement = pDoc->createElement((_bstr_t)(char*)"Population");
		pElement->setAttribute((_bstr_t)(char*)"Units", (_variant_t)(char*)"Million Person"); // 統計單位
		pElement->setAttribute((_bstr_t)(char*)"StatisticalYear", (_variant_t)(char*)"2000"); // 統計年份
		pElement->Puttext((_bstr_t)(char*)"13.82");
		pNode2->appendChild((MSXML2::IXMLDOMNode*)pElement); // 節點

		pNode->insertBefore(pNode2, (_variant_t)(IDispatch*)pNode1);
		//
		// (8)建立節點<China><Municipality><ShangHai>
		// (9)建立節點<China><Municipality><ChongQing>

		pDoc->save((_variant_t)szXmlFile);

		return EXIT_SUCCESS;
}

生成的china.xml文檔內容：

<?xml version="1.0" encoding="utf-8"?>
<China>
<!--所在的洲-->
  <Continent>Asia</Continent>
  <!--人口數量-->
  <Population Units="Million Person" StatisticalYear="2000">1,296</Population>
  <!--四個直轄市-->
  <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文檔示例

// 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"; //上篇建立的xml文檔
	IXMLDOMDocumentPtr pDoc = NULL; // xml文檔
	IXMLDOMNodeListPtr pNodeList = NULL; // 節點鏈表
	IXMLDOMElementPtr pRootElement = NULL, pElement = NULL; // 根節點(元素)
	IXMLDOMNodePtr pNode = NULL, pNode1 = NULL; // 節點
	IXMLDOMNamedNodeMapPtr pAttrList = NULL; // 屬性鏈表
	IXMLDOMAttributePtr pAttrNode = NULL; // 屬性
	long lChilds, lAttr, i;

	HRESULT hr = pDoc.CreateInstance(__uuidof(DOMDocument40));
	if (FAILED(hr))
	{
		printf("沒法建立DOMDocument40對象，請檢查是否安裝並初始化了MsXml Parser庫！");
		return EXIT_FAILURE;
	}

	VARIANT_BOOL bXmlLoad = pDoc->load((_variant_t)szXmlFile);
	if (!bXmlLoad) // 加載失敗
	{
		printf("加載%s失敗！/n", szXmlFile);
		return EXIT_FAILURE;
	}
    
	// (1)根節點
	pRootElement = pDoc->GetdocumentElement();
	printf("root = %s/n", (char*)pRootElement->GetnodeName()); // pRootElement->nodeName

	// (2)根節點的一級子節點
	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) // 過濾註釋節點
		{
			printf("child[%d] of [%s]: [%s]/n", i ,(char*)pRootElement->GetnodeName(), (char*)pNode->GetnodeName());
		}
	}

	// (3)統計文檔中全部的<Population>節點
	pNodeList = pDoc->getElementsByTagName((_bstr_t)(char*)"Population");
	lChilds = pNodeList->Getlength();
	printf("文檔中[Population]共有%d個/n", lChilds);

	// (4)根節點下的<Population>節點
	pNode = pRootElement->selectSingleNode((_bstr_t)(char*)"Population");
	// 已知根節點爲<China>時：pNode = pDoc->selectSingleNode((_bstr_t)(char*)"China//Population");
	printf("根節點下的[Population]子節點值爲%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)查找節點<Municipality>下的全部子節點
	// "//"表示在任意一層尋找Municipality；"//*"查找<Municipality></Municipality>中的全部子節點
	pNodeList = pDoc->selectNodes((_bstr_t)(char*)"//Municipality//*"); // 這裏可將pDoc換成pRootElement
	while (pNode = pNodeList->nextNode())
	{
		printf("childs of [Municipality]: %s/n", (char*)pNode->GetnodeName());
	}

	// (6)查找節點<Municipality>下的一級子節點
	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)查詢父、子、兄、弟節點
	pNode = pRootElement->selectSingleNode((_bstr_t)(char*)"//TianJin");
	pNode1 = pNode->GetparentNode(); // 父節點
	printf("[TianJin]的父節點爲[%s]/n", (char*)pNode1->GetnodeName());

	pNodeList = pNode->GetchildNodes(); // 子節點
	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(); // 兄節點
	printf("[TianJin]的兄節點爲[%s]/n", (char*)pNode1->GetnodeName());

	pNode1 = pNode->GetnextSibling(); // 弟節點
	printf("[TianJin]的弟節點爲[%s]/n", (char*)pNode1->GetnodeName());

	return EXIT_SUCCESS;
}

運行結果以下：

root = China

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

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

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

文檔中<Population>共有5個

根節點下的<Population>子節點值爲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

childs of <Municipality>: TianJin

childs of <Municipality>: Area

childs of <Municipality>: Population

childs of <Municipality>: ShangHai

childs of <Municipality>: Area

childs of <Municipality>: Population

childs of <Municipality>: ChongQing

childs of <Municipality>: Area

childs of <Municipality>: Population

child[0] of <Municipality>: BeiJing

child[1] of <Municipality>: TianJin

child[2] of <Municipality>: ShangHai

child[3] of <Municipality>: ChongQing

<TianJin>的父節點爲<Municipality>

child[0] of <TianJin>: Area

child[1] of <TianJin>: Population

<TianJin>的兄節點爲<BeiJing>

<TianJin>的弟節點爲<ShangHai>