libxml2实现xml文档的节点的修改

/********************************************************************** 

                Copyright, 2011, **** Tech. Co., Ltd. 

                            All Rights Reserved 

----------------------------------------------------------------------- 

Project Code   : wlan 

File name      : modify_node.cpp 

Author         : Sky_qing 

Description    : 使用libxml2修改xml文档的节点

Function List: 

----------------------------------------------------------------------- 

History:  

Date            Author                 Modification 

2011-12-27     Sky_qing                created file

**********************************************************************/
#include <stdio.h>
#include "libxml/parser.h"
#include "libxml/tree.h"

int main(int argc, char* argv[])
{
	xmlDocPtr doc;				//定义解析文档指针
	xmlNodePtr curNode;			//定义节点指针（在各个节点之间移动）
	char* szDocName = argv[1];	//保存xml文档名,该文档名在运行程序到时候输入。
	//例如：编译格式为g++ modify_node.cpp -o modify_node -I /usr/local/include/libxml2/  -L /usr/local/lib -lxml2，生成可执行文件modify_node，运行时：./modify_node log4crc（此处log4crc为要修改的xml文档）

	printf("........start........\n");
    doc = xmlReadFile(szDocName, "utf-8", XML_PARSE_RECOVER); 	//解析文档
	if (NULL == doc)
	{
		fprintf(stderr, "Document not parsed successfully.\n");
		
		return -1;
	}

	curNode = xmlDocGetRootElement(doc);		//确定文档根元素
	if (NULL == curNode)
	{
		fprintf(stderr, "Empty Document.\n");
		xmlFreeDoc(doc);		//释放文件

		return -1;
	}

	if (xmlStrcmp(curNode->name, (const xmlChar*)"log4c"))	//确认根元素是否为“log4c”
	{
		fprintf(stderr, "Document of wrong type. root node != log4c");
		xmlFreeDoc(doc);

		return -1;
	}

	curNode = curNode->xmlChildrenNode;
	xmlNodePtr propNode = curNode;
	while (NULL != curNode)		//遍历所有节点
	{
		//获取名称为category的节点
		if (!xmlStrcmp(curNode->name, (const xmlChar*)"category"))
		{
			//查找带有属性name的节点
      		if (xmlHasProp(curNode, BAD_CAST "name"))
       		{
                propNode = curNode;
     		}

			//查找属性name为WLAN_Console的节点
    		xmlAttrPtr attrPtr = propNode->properties;
			while (NULL != attrPtr)		//遍历所有名称为category的节点
    		{
		   		if (!xmlStrcmp(attrPtr->name, (const xmlChar*)"name"))	//找到有name属性到节点
		   		{
					//查找属性为name的值的节点
					xmlChar* szPropity = xmlGetProp(propNode, (const xmlChar*)"name");
					if (!xmlStrcmp((const xmlChar*)szPropity, (const xmlChar*)"WLAN_Console"))
					{
						xmlAttrPtr setAttrPtr = propNode->properties;
						while (NULL != setAttrPtr)
						{
							//设置属性priority的值
							xmlSetProp(propNode, (const xmlChar*)"priority", (const xmlChar*)"debug");
			
							setAttrPtr = setAttrPtr->next;
						}
					}
		  		}
		   		attrPtr = attrPtr->next;
	   		}	
		}
		curNode = curNode->next;
	}
	
	//保存文档到原文档中
	xmlSaveFile("log4crc", doc);

	printf("...........OK............\n");

	return 0;
}</stdio.h>