xml文件解析(二)——运用libxml2库解析xml文件

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如何解析一个xml文件呢，我们可以使用libxml2库。

libxml2解析xml文件的要点是需要理解xml文档的树形结构，弄懂三个指针root,children及next，其分别代表父、子及同胞关系。

安装libxml2：

依赖：需要安装python-devel——yuminstall python-devel

安装libxml2——./configure; make; make install

主要函数：

xmlDocPtr xmlParseFile(const char *filename);

xmlDocPtr xmlParseMemory(const char *buffer, int size);

xmlNodePtr xmlDocGetRootElement(constxmlDoc* doc);

xmlChar * xmlNodeGetContent(const xmlNode*cur);

xmlChar * xmlGetProp(const xmlNode *node,const xmlChar *name);

xmlFree(xmlNodePtr)

xmlFreeDoc(xmlDocPtr)

实例：

testXml.cpp

#include <iostream>#include <libxml/parser.h>#include <string>using namespace std;void parseXmlNode(const xmlNodePtr & xmlRootNode);const char* xmlFilename = "bookstore.xml";int main(){xmlDocPtr doc = xmlParseFile(xmlFilename);if(NULL == doc){cout << "Parsed xmlFile failed!" << endl;return -1;}xmlNodePtr xmlRootNode = xmlDocGetRootElement(doc);if(NULL == xmlRootNode){cout << "GetRootElement failed" << endl;xmlFreeDoc(doc);return -1;} parseXmlNode(xmlRootNode);xmlFreeDoc(doc);return 0;}void parseXmlNode(const xmlNodePtr & xmlRootNode){xmlNodePtr xmlChildNode = xmlRootNode->xmlChildrenNode;while(NULL != xmlChildNode){if(xmlChildNode->xmlChildrenNode != NULL){cout << "" << (char *)xmlChildNode->name << ":";cout << "\t" << (char*)xmlNodeGetContent(xmlChildNode) << endl;}if (!xmlStrcmp(xmlChildNode->name, (const xmlChar*)"title")){cout << "lang of " << (char *)xmlChildNode->name << " is " << (char *)xmlGetProp(xmlChildNode, (const xmlChar*)"lang") << endl;}if (xmlChildNode->xmlChildrenNode != NULL){parseXmlNode(xmlChildNode);}xmlChildNode = xmlChildNode->next;}return ;}

编译：

g++ testXml.cpp -I/usr/local/libxml2/include/libxml2/ -lxml2

其中/usr/local/libxml2/include/libxml2/指出了libxml文件夹的路径

输出：

book:  Everyday Italian   Giada De Laurentiis   2005   30.00 title:Everyday Italianlang of title is enauthor:Giada De Laurentiisyear:2005price:30.00book:  Harry Potter   J K. Rowling   2005   29.99 title:Harry Potterlang of title is enauthor:J K. Rowlingyear:2005price:29.99

其中bookstore.xml 如下：

<bookstore><book category="COOKING">  <title lang="en">Everyday Italian</title>   <author>Giada De Laurentiis</author>   <year>2005</year>   <price>30.00</price> </book><book category="CHILDREN">  <title lang="en">Harry Potter</title>   <author>J K. Rowling</author>   <year>2005</year>   <price>29.99</price> </book><bookstore>

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