C语言利用libxml2读配置文件函数

C语言解析XML文件实现起来很麻烦，最简单地做法是使用开源的LIBXML2库。

 

int ReadConfig(char *file_name,char *key, char val[])
{
    xmlChar *psXml = NULL;
    char xmlPath[1024] = "/CONFIG/";
    xmlXPathContextPtr pXmlContext = NULL;
    xmlXPathObjectPtr pXPathObject = NULL;

    xmlDocPtr pXmlDoc = NULL;
    pXmlDoc = xmlReadFile(file_name, NULL, 0);
    if(pXmlDoc == NULL)
    {
        return -1;
    }
    strcat(xmlPath, key);
    pXmlContext = xmlXPathNewContext(pXmlDoc);
    if(pXmlContext == NULL)
    {
        return -1;
    }
    pXPathObject = xmlXPathEvalExpression((xmlChar *)xmlPath, pXmlContext);
    if(pXPathObject == NULL)
    {
        xmlXPathFreeContext(pXmlContext);
        return -1;
    }
    xmlXPathFreeContext(pXmlContext);
    if(pXPathObject->nodesetval->nodeNr > 0)
    {
        psXml = xmlNodeGetContent(pXPathObject->nodesetval->nodeTab[0]);
        if(psXml != NULL)
        {
            strcpy(val, (char *)psXml);
        }
    }
    xmlXPathFreeObject(pXPathObject);
    xmlFreeDoc(pXmlDoc);
    return 0;
}