<span style="font-size:24px;">    很久没有碰xml这种东西了，今天有一朋友问如何解析一个xml文档，并获取每个节点对应的节点值，于是在网上找了一番，虽然有很多方法可以实现，但总觉得不如我所愿，于是自己用C语言写个简单的程序来实现此功能，仅供参考。</span>

#include <stdio.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/xpath.h>
#include <string.h>


#define     MAXSIZE     1024

int count;
char *nodeName[MAXSIZE]; /* save xmlNode name */
char *nodeValue[MAXSIZE]; /* save xmlNode value */

/* get xml node name and value */

int getNameValue(xmlNodePtr rootNode,char *saveName[],char *saveValue[])
{
    xmlNodePtr curNode = NULL;
    xmlChar *szkey = NULL;

    if(rootNode == NULL)
    {
        return -1;
    }

    curNode = rootNode;
    curNode = curNode->xmlChildrenNode;
    while(curNode != NULL)
    {
       /* ignore xmlNode name is "text" node */

	if(strcmp(curNode->name,"text") != 0)
        {
            saveName[count] = (char *)curNode->name;
            if(curNode->xmlChildrenNode->next == NULL)
            {
                szkey = xmlNodeGetContent(curNode);
                saveValue[count] = (char *)szkey;
            }
            else
                saveValue[count] = "";

            count ++;
        }

        if(curNode->xmlChildrenNode != NULL)
        {
            getNameValue(curNode,saveName,saveValue);
        }

        curNode = curNode->next;
    }

    return 0;
}

/* parsing xml file */

int readfile(char *file)
{
    xmlDocPtr doc = NULL;
    xmlNodePtr rootNode = NULL;
    count = 0;

    doc = xmlReadFile(file,"UTF-8",XML_PARSE_RECOVER);
    if(doc == NULL)
    {
        perror("xmlReadFile() error !\n");
        return -1;
    }

    //doc = xmlParseMemory(buff,strlen(buf)+1);//xml字符串解析
    rootNode = xmlDocGetRootElement(doc);//xml文件解析
    if(NULL == rootNode)
    {
        printf("doc is empty\n");
        xmlFreeDoc(doc);
        return -1;
    }

    getNameValue(rootNode,nodeName,nodeValue);

    return 0;
}

下面是main 函数：

<pre name="code" class="objc">int main(int argc,char *argv[])
{
    int ret;
    int i;
    int j;
    if(argv[1] == NULL)
    {
        printf("eg: ./xxx.exe [xxx.xml] \n");
        return 0;
    }

    ret = readfile(argv[1]);
    if(ret == -1)
    {
        printf("error !\n");
        return 0;
    }
	
	printf("%d\n",count);

    printf("***********************************************************\n");
    for(i = 0; i < count ; i++)
    {
        printf("%s:  %s\n",nodeName[i],nodeValue[i]);
    }

    return 0;
}

代码写好之后就是编译，如下：

gcc -o test getXml.c -lxml2 -I/usr/include/libxml2

编写一个标准的xml文档Network.xml内容如下：

<?xml version="1.0" encoding="utf-8"?>
<NetworkInterfaceList version="1.0">
 <NetworkInterface version="1.0">
     <id>0</id>
     <IPAddress>
        <ipVersion>v4</ipVersion>
        <addressingType>static</addressingType>
        <ipAddress>192.168.1.124</ipAddress>
        <subnetMask>255.255.255.0</subnetMask>
        <ipv6Address>xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx</ipv6Address>
        <bitMast>2</bitMast>
        <DefaultGateway>
            <ipAddress>192.168.1.0</ipAddress>
            <ipv6Address>xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx</ipv6Address>
        </DefaultGateway>
        <PrimaryDNS>
            <ipAddress>192.168.1.22</ipAddress>
            <ipv6Address>xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx</ipv6Address>
        </PrimaryDNS>
        <SecondaryDNS>
            <ipAddress>192.168.1.11</ipAddress>
            <ipv6Address>xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx</ipv6Address>
        </SecondaryDNS>
    </IPAddress>
  </NetworkInterface>
 </NetworkInterfaceList>