libxml2应用实例 -- 目录树的xml实现

    最近项目有项递归目录，保存为xml的工作，运用了libxml2这个开源库，对xml进行了详细的理解。简单介绍下思路，就是递归所有目录和子文件，生成一颗正常的树，并将这棵树写如xml。功能简单，主要是记录下libxml的使用方法   废话少说，直接上代码

#include <stdio.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <list>
#include <iostream>
#ifdef __cplusplus
extern "C"
{
#endif
#include <libxml/parser.h>
#include <libxml/tree.h>
#ifdef __cplusplus
}
#endif

struct node_t{                          //递归树的结构，用的是儿子列表法
    std::string name;
    std::list<struct node_t*> pChild;
};
typedef struct node_t node;

node root;
xmlDocPtr doc = NULL;
xmlNodePtr root_node = NULL;
void List(const char *path, int level,node *parentnode,xmlNodePtr parentXmlNode)
{
    struct dirent *ent = NULL;
    DIR *pDir;
    if((pDir = opendir(path)) != NULL)
    {
        while(NULL != (ent = readdir(pDir)))
        {
            node *tmpnode = new node;
            if(!tmpnode)
            {
                std::cout<<"alloc node errorn";
                return ;
            }

            xmlNodePtr tmpxmlnode;

            if(ent->d_type == 8 && ent->d_name[0] != '.') // d_type：8-文件，4-目录
            {
                tmpnode->name = ent->d_name;
                parentnode->pChild.push_back(tmpnode);
                tmpxmlnode = xmlNewChild(parentXmlNode,NULL,BAD_CAST ent->d_name,BAD_CAST tmpnode->name.c_str());
            }
            else if(ent->d_name[0] != '.')
            {
                char *p = (char*)malloc(strlen(path) + strlen(ent->d_name) + 2);
                strcpy(p, path);
                strcat(p, "/");
                strcat(p, ent->d_name);
                tmpnode->name = p;
                parentnode->pChild.push_back(tmpnode);
                tmpxmlnode = xmlNewChild(parentXmlNode,NULL,BAD_CAST ent->d_name,BAD_CAST ent->d_name);
                List(p, level+1, tmpnode, tmpxmlnode); // 递归遍历子目录
                free(p);
            }
        }
        closedir(pDir);
    }

}

void testcase()
{
    std::list<struct node_t*>::iterator itr = (*(*(*(root.pChild.begin()))->pChild.begin())->pChild.begin())->pChild.begin();

    int num = root.pChild.size();
    for(;itr != (*(*(*(root.pChild.begin()))->pChild.begin())->pChild.begin())->pChild.end(); itr++)
    {
        std::cout<<"path is "<<(*itr)->name<<std::endl;
    }
}

int main()
{
    std::string path = "/media/disk/ffmpeg-0.9.2/mytest";
    root.name = path;
    doc = xmlNewDoc(BAD_CAST "1.0");
    root_node = xmlNewNode(NULL, BAD_CAST "root");
    xmlDocSetRootElement(doc,root_node);
    List(path.c_str(), 0, &root, root_node);
    //testcase();

    xmlSaveFormatFileEnc("test.xml",doc,"UTF-8",1);
    if(doc)
    {
        xmlFreeDoc(doc);
    }
    xmlCleanupParser();
    return 0;
}