怎样用vc++读写xml文件

用微软的 DOM,

MSXML4

//引入msxml4.dll

#import "C:/WINNT.0/system32/msxml4.dll"

//创建XMLDOMDocument指针

MSXML2::IXMLDOMDocumentPtr pXMLDoc

// 初始化COM接口

::CoInitialize(NULL)

// 通过智能指针创建一个解析器的实例

HRESULT hr

hr =pXMLDoc.CreateInstance(__uuidof(MSXML2::DOMDocument30))

//加载文件

pXMLDoc->load("f://he.xml")

//在树中查找名为City的节点,"//"表示在任意一层查找

MSXML2::IXMLDOMElementPtr childNode

childNode = (MSXML2::IXMLDOMElementPtr)(pXMLDoc->selectSingleNode("//AUTHOR"))

//得到节点类型

MSXML2::DOMNodeType nodeType

childNode->get_nodeType(&nodeType)

//庆液宏节点名称埋桥

BSTR var

CString name

childNode->get_nodeName(&var)

name = (char*)(_bstr_t)var

//节点值

VARIANT varVal

childNode->get_nodeTypedValue(&varVal)

CString strValue = (char*)(_bstr_t)varVal

读属性：

//节点属性,放在链表中

MSXML2::IXMLDOMNamedNodeMapPtr pAttrs = NULL

MSXML2::IXMLDOMNodePtr pAttrItem

childNode = (MSXML2::IXMLDOMElementPtr)(pXMLDoc->selectSingleNode("//NUM"))

childNode->get_attributes(&pAttrs)

long nCount

pAttrs->get_length(&nCount)

for(int i = 0 i < nCount i++)

{

pAttrs->get_item(i,&pAttrItem)

//我们可以通过函数get_nodeName,get_nodeTypedValue得到属性名和属性值

//也可以直接得到

CString strAttrName = (char*)(_bstr_t)pAttrItem->nodeName

CString strAttrValue = (char*)(_bstr_t)pAttrItem->nodeTypedValue

}

另外

可以用MSXML DOM

创建一个文档对象的过程誉册。

HRESULT hr

IXMLDomDocument* pXMLDoc

IXMLDOMNode* pXDN

Hr=CoInitialize(NULL) //COM的初始化

hr=CoCreateInstance(CLSID_DOM Document,NULL,CLSCTX_INPPROC_SERVER,

IID_IXMLDOMDocument,(void**) &pXMLDoc)

hr=pXMLDoc->QueryInterface (IID_IXMLDOMNode,(void**)&pXDN)

使用文档中的createElement方法来创建一个节点装载和保存XML文件。通过load或者是loadXML方法可以从一个指定的URL来装载一个XML文档Save方法是用来把文档保存到一个指定的位置，用getElementsByTagName获得制定节点数据

二、

// 创建对象

CoInitialize(NULL)// 初始化COM

// 创建解析器实例

CComPtr<IXMLDOMDocument>spXMLDOM

BSTR bstrItemText

//long value

CString strbuf

HRESULT hr=spXMLDOM.CoCreateInstance (_uuidof(DOMDocument))

spXMLDOM->put_async(VARIANT_FALSE)

spXMLDOM->put_validateOnParse(VARIANT_FALSE)

spXMLDOM->put_resolveExternals(VARIANT_FALSE)

spXMLDOM->put_preserveWhiteSpace(VARIANT_TRUE)

_bstr_t path = _bstr_t(xmlPath)

// 装载XML文档。

hr=spXMLDOM->load(path)

// 1、读取里面全部文本

spXMLDOM->get_text(&bstrItemText)// new

strbuf = bstrItemText// new

// 2、读取一个节点

_bstr_t bstrSS("paragraph")

CComPtr<IXMLDOMNodeList>spParagraphs

spParagraphs=spXMLDOM->getElementsByTagName(bstrSS)//搜索"Paragrah"

//是否正确的得到了指向IDOMNodeList的指针。

hr = spParagraphs->get_length(&value)//得到所包含的NODE节点的个数

if(SUCCEEDED(hr))

...{

spParagraphs->reset()

for(int ii=0ii<valueii++)

...{

CComPtr<IXMLDOMNode>spParagraph

//得到具体的一个NODE节点

//hr = spParagraphs->get_item(ii,&spParagraph)

spParagraph = spParagraphs->nextNode()

if(SUCCEEDED(hr))

...{

spParagraph->get_text(&bstrItemText)//得到该节点相关的文本信息

strbuf += bstrItemText

strbuf += " "

}

}

}

下面是我写的生成XML文件的例子，主要是用递归来完成嵌套的XML生成。

生成的格式为：

<Datas>

<Data>

<year>

</year>

<paper>

<name> </name>

<number></number>

<weight></weight>

<paper>

</paper>

.....

</paper>

</Data>

...

</Datas>

#include <fstream>

#include <iostream>

#include <string>

#include <ctime>

#include <cstdlib>

using namespace std

const int MAX_YEAR = 6

const int MAX_NODENAME = 8

const int MAX_DEPTH = 1

const int MAX_ITEM = 15

const int MAX_TAGS = 50

enum NodeName

{

DATAS,

DATA,

YEAR,

PAPERS,

NUMBER,

WEIGHT,

TAG,

NAME

}

string NodeBegin[MAX_NODENAME] = {"<Datas>", "<Data>", "<year>", "<paper>", "<number>", "<weight>", "<tag>", "<name>"}

string NodeEnd[MAX_NODENAME] = {"</Datas>", "</Data>", "</year>", "</paper>", "<咐族碰/number>", "</weight>", "</tag>"衡谈, "</name>"}

string Years[MAX_YEAR] = {"2000","2001","2002","2003","2004","2005"}

//_T的穗孙意思是通知编译器，自行进行字符串的多字节/Unicode转换。

//而L表示，该字符串为Unicode版本。

ofstream outfile(L"首页.xml")

int Random(int i)

{

return (rand()%i+1)

}

void Recursive(int level, string parentName, string year)

{

if (level == 1)

{

for (int i = 0i <MAX_ITEMi++)

{

outfile<<NodeBegin[PAPERS]<<endl

outfile<<NodeBegin[NAME]<<parentName<<"-"<<i<<NodeEnd[NAME]<<endl

outfile<<NodeBegin[NUMBER]<<Random(10)<<NodeEnd[NUMBER]<<endl

outfile<<NodeBegin[WEIGHT]<<Random(10)<<NodeEnd[WEIGHT]<<endl

outfile<<NodeEnd[PAPERS]<<endl

}

for (int j =0j <MAX_TAGSj++)

{

outfile<<NodeBegin[TAG]<<endl

outfile<<NodeBegin[NAME]<<year<<":"<<parentName<<"-"<<j<<NodeEnd[NAME]<<endl

outfile<<NodeBegin[WEIGHT]<<Random(10)<<NodeEnd[WEIGHT]<<endl

outfile<<NodeEnd[TAG]<<endl

}

}

else

{

for (int i = 0i <MAX_ITEMi++)

{

char a[10]

string str

itoa(i, a, 10)

str = a

string curName = parentName+"-"+str

outfile<<NodeBegin[PAPERS]<<endl

outfile<<NodeBegin[NAME]<<curName<<NodeEnd[NAME]<<endl

outfile<<NodeBegin[NUMBER]<<Random(10)<<NodeEnd[NUMBER]<<endl

outfile<<NodeBegin[WEIGHT]<<Random(10)<<NodeEnd[WEIGHT]<<endl

Recursive(level-1, curName, year)

outfile<<NodeEnd[PAPERS]<<endl

}

for (int j =0j <MAX_TAGSj++)

{

outfile<<NodeBegin[TAG]<<endl

outfile<<NodeBegin[NAME]<<"Tag"<<year<<":"<<parentName<<"-"<<j<<NodeEnd[NAME]<<endl

outfile<<NodeBegin[WEIGHT]<<Random(10)<<NodeEnd[WEIGHT]<<endl

outfile<<NodeEnd[TAG]<<endl

}

}

}

void GenerateXML()

{

outfile<<NodeBegin[DATAS]<<endl

for (int i = 0i <MAX_YEARi++ )

{

outfile<<NodeBegin[DATA]<<endl

outfile<<NodeBegin[YEAR]<<Years[i]<<NodeEnd[YEAR]<<endl

Recursive(MAX_DEPTH, "学科主题",Years[i])

outfile<<NodeEnd[DATA]<<endl

}

outfile<<NodeEnd[DATAS]<<endl

}

void main()

{

locale::global(locale(""))

srand(time(NULL))

if (!outfile)

{

cout<<"can't open output file"<<endl

}

GenerateXML()

cout<<"Generate End."<<endl

}

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