VC++ MSXML创建XML文件以及对XML文档解析
C/C++ code
// 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 code
<?xml version="1.0" encoding="utf-8"?>
<China>
<!--所在的洲-->
<Continent>Asia</Continent>
<!--人口数量-->
<Population Units="Million Person" StatisticalYear="2000">1,296</Population>
<!--四个直辖市-->
<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文档示例:
- C/C++ code
// 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
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>的父节点为<Municipality>
child[0] of <TianJin>: Area
child[1] of <TianJin>: Population
<TianJin>的兄节点为<BeiJing>
<TianJin>的弟节点为<ShangHai>
