c++中如何遍历XML

我们建立一个xml文件,内容如图所示:

一,建立一个基于对话框的程序,工程名为xml;

二, 初始化OLE.

BOOL CXmlApp::InitInstance()

{

AfxOleInit();

…….

}

三, 在对话框中增加一个按钮,ID为IDC_CREA TE,我们在这个按钮的响应函数中生成一个xml文件.

void CXmlDlg::OnCreate()

{

MSXML2::IXMLDOMDocumentPtr pDoc;

MSXML2::IXMLDOMElementPtr xmlRoot ;

//创建DOMDocument对象

HRESULT hr = pDoc.CreateInstance(__uuidof(MSXML2::DOMDocument30));

if(!SUCCEEDED(hr))

{

MessageBox( "无法创建DOMDocument对象，请检查是否安装了MS XML Parser 运行库! ");

}

//根节点的名称为china

pDoc-> raw_createElement((_bstr_t)(char*) "china ", &xmlRoot);

pDoc-> raw_appendChild(xmlRoot, NULL);

MSXML2::IXMLDOMElementPtr childNode ;

pDoc-> raw_createElement((_bstr_t)(char*) "City ", &childNode);

childNode-> Puttext( "WuHan ");//节点值

childNode-> setAttribute( "population ", "8,000,000 ");//属性名,属性值

childNode-> setAttribute( "area ", "10000 ");

xmlRoot-> appendChild(childNode);

pDoc-> raw_createElement((_bstr_t)(char*) "City ", &childNode);

childNode-> Puttext( "ShangHai ");

childNode-> setAttribute( "population ", "12,000,000 ");

childNode-> setAttribute( "area ", "12000 ");

xmlRoot-> appendChild(childNode);

//保存到文件

//如果不存在就建立,存在就覆盖

pDoc-> save( "f:\\he.xml ");

}

不要忘了#import "msxml4.dll " //引入类型库

四, 再增加一个按钮,ID为IDC_GET,在这个按钮的响应函数中读取xml文件.

void CXmlDlg::OnGet()

{

//创建DOMDocument对象

MSXML2::IXMLDOMDocumentPtr pDoc;

HRESULT hr = pDoc.CreateInstance(__uuidof(MSXML2::DOMDocument30));

if(!SUCCEEDED(hr))

{

MessageBox( "无法创建DOMDocument对象，请检查是否安装了MS XML Parser 运行库! ");

}

//加载文件

pDoc-> 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)(pDoc-> selectSingleNode( "//City "));

//得到节点类型

MSXML2::DOMNodeType nodeType;

childNode-> get_nodeType(&nodeType);

//节点名称

BSTR var;

CString name;

childNode-> get_nodeName(&var);

name = (char*)(_bstr_t)var;

//节点值

V ARIANT varV al;

childNode-> get_nodeTypedV alue(&varV al);

CString strV alue = (char*)(_bstr_t)varV al;

//节点属性,放在链表中

MSXML2::IXMLDOMNamedNodeMapPtr pAttrs = NULL;

MSXML2::IXMLDOMNodePtr pAttrItem;

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_nodeTypedV alue得到属性名和属性值

//也可以直接得到

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

CString strAttrV alue = (char*)(_bstr_t)pAttrItem-> nodeTypedV alue;

}

晕，这个我知道，关键是它只能查找City一个节点，那其它节点如何自己遍历呢？总不能手动吧。

MSXML2::IXMLDOMElementPtr

CXML::FindChildXMLElement(MSXML2::IXMLDOMElementPtr xml, const LPCTSTR name)

{

MSXML2::IXMLDOMNodeListPtr nodelist = xml-> GetchildNodes();

long nCount = nodelist-> length;

for(int i=0;i

{

MSXML2::IXMLDOMNodePtr childnode = nodelist-> item[i];

MSXML2::DOMNodeType nodeType = childnode-> nodeType;

if(nodeType==MSXML2::NODE_ELEMENT)

{

MSXML2::IXMLDOMElementPtr xmlnode = childnode;

CString nodename = (char*)childnode-> nodeName;

if(nodename == name)

{

return xmlnode;

}

}

}

return NULL;

}