我这边的libxlm2是安装centOS6.5时自带的, 其默认的头文件的位置是:
/usr/include/libxml2/libxml/
文件如下:
生成xml文件的代码如下:
/****************************************************** * 练习libxml2库,创建通讯录xml文档,新增一个通讯录, * * 如果xml文件存在,则添加一个新节点 * * 如果xml文件不存在,则新建一个xml文件 * * * * @author: xiao5 @date: 2016/01/04 * * ****************************************************/ #include <stdio.h> #include <string.h> #include <unistd.h> #include <assert.h> #include <libxml/parser.h> #include <libxml/tree.h> #include <libxml/xmlmemory.h> #define PHONE_BOOK_FILE "phone_book.xml" // 新增的xml文件的文件名 #define ID_STR_LEN 16 #define NAME_STR_LEN 32 #define TEL_STR_LEN 16 #define ADDR_STR_LEN 128 //电话通讯录结构体 typedef struct phone_t { int id; //编号 char name[NAME_STR_LEN]; //姓名 char tel[TEL_STR_LEN]; //电话 char address[ADDR_STR_LEN]; //地址 }phone; //设置通讯录项 static void set_phone_item(phone *phone_item) { assert(phone_item); // 设置断言,若程序返回错误则终止程序的执行 /* 结构体数据初始化 */ phone_item->id = 10; snprintf(phone_item->name, NAME_STR_LEN, "%s", "刘德华"); snprintf(phone_item->tel, TEL_STR_LEN, "%s", "13018937180"); snprintf(phone_item->address, ADDR_STR_LEN, "%s", "浙江省杭州市上城区凤起路888号中国人民银行浙江省分行"); } //创建phone节点 static xmlNodePtr create_phone_node(const phone *phone_item) { assert(phone_item); char id[ID_STR_LEN] = {0}; xmlNodePtr phone_node = NULL; phone_node = xmlNewNode(NULL, BAD_CAST"phone"); if (phone_node == NULL) { fprintf(stderr, "Failed to create new node.\n"); return NULL; } //设置属性 snprintf(id, ID_STR_LEN, "%d", phone_item->id); xmlNewProp(phone_node, BAD_CAST"id", (xmlChar*)id); xmlNewChild(phone_node, NULL, BAD_CAST"name", (xmlChar *)phone_item->name); xmlNewChild(phone_node, NULL, BAD_CAST"tel", (xmlChar *)phone_item->tel); xmlNewChild(phone_node, NULL, BAD_CAST"address", (xmlChar *)phone_item->address); return phone_node; } //向根节点中添加一个phone节点 static int add_phone_node_to_root(xmlNodePtr root_node) { xmlNodePtr phone_node = NULL; phone *phone_item = NULL; //创建一个新的phone phone_item = (phone *)malloc(sizeof(phone)); if (phone_item == NULL) { fprintf(stderr, "Failed to malloc memory.\n"); return -1; } set_phone_item(phone_item); //创建一个phone节点 phone_node = create_phone_node(phone_item); if (phone_node == NULL) { fprintf(stderr, "Failed to create phone node.\n"); goto FAILED; } //根节点添加一个子节点 xmlAddChild(root_node, phone_node); free(phone_item); return 0; FAILED: if (phone_item){ free(phone_item); } return -1; } //创建phone_books static int create_phone_books(const char *phone_book_file) { assert(phone_book_file); xmlDocPtr doc = NULL; xmlNodePtr root_node = NULL; //创建一个xml 文档 doc = xmlNewDoc(BAD_CAST"1.0"); if (doc == NULL) { fprintf(stderr, "Failed to new doc.\n"); return -1; } //创建根节点 root_node = xmlNewNode(NULL, BAD_CAST"phone_books"); if (root_node == NULL) { fprintf(stderr, "Failed to new root node.\n"); goto FAILED; } //将根节点添加到文档中 xmlDocSetRootElement(doc, root_node); if (add_phone_node_to_root(root_node) != 0) { fprintf(stderr, "Failed to add a new phone node.\n"); goto FAILED; } //将文档保存到文件中,按照utf-8编码格式保存 xmlSaveFormatFileEnc(phone_book_file, doc, "UTF-8", 1); //xmlSaveFile("test.xml", doc); xmlFreeDoc(doc); return 0; FAILED: if (doc) { xmlFreeDoc(doc); } return -1; } static int add_phone_node(const char *phone_book_file) { assert(phone_book_file); xmlDocPtr doc = NULL; xmlNodePtr root_node = NULL; xmlNodePtr phone_node = NULL; phone *phone_item = NULL; doc = xmlParseFile(phone_book_file); if (doc == NULL) { fprintf(stderr, "Failed to parser xml file:%s\n", phone_book_file); return -1; } root_node = xmlDocGetRootElement(doc); if (root_node == NULL) { fprintf(stderr, "Failed to get root node.\n"); goto FAILED; } if (add_phone_node_to_root(root_node) != 0) { fprintf(stderr, "Failed to add a new phone node.\n"); goto FAILED; } //将文档保存到文件中,按照utf-8编码格式保存 xmlSaveFormatFileEnc(phone_book_file, doc, "UTF-8", 1); xmlFreeDoc(doc); return 0; FAILED: if (doc) { xmlFreeDoc(doc); } return -1; } int main(int argc, char *argv[]) { char *phone_book_file = PHONE_BOOK_FILE; if (argc == 2) { phone_book_file = argv[1]; } if (access(phone_book_file, F_OK) == 0) { //文件存在,添加一个新的phone节点 add_phone_node(phone_book_file); } else { //文件不存在,创建一个信息的phone book create_phone_books(phone_book_file); } return 0; }
编译命令:
gcc -I /usr/include/libxml2 -L /usr/local/lib -lxml2 1.c -o 1
生成的文件的内容如下:
<?xml version="1.0" encoding="UTF-8"?> <phone_books> <phone id="10"> <name>刘德华</name> <tel>13018937180</tel> <address>浙江省杭州市上城区凤起路888号中国人民银行浙江省分行</address> </phone> </phone_books>
解析代码:
/******************************************** * 调用libxml2库解析xml,提取出电话薄信息 * * * * @author:xiao5 @date:2016/01/04 * * ******************************************/ #include <stdio.h> #include <assert.h> #include <libxml/xmlmemory.h> #include <libxml/parser.h> #define DEFAULT_XML_FILE "phone_book.xml" //解析每一个phone,提取出name、tel、address static int parse_phone(xmlDocPtr doc, xmlNodePtr cur) { assert(doc || cur); xmlChar *key; cur = cur->xmlChildrenNode; while (cur != NULL) { //获取name if ((!xmlStrcmp(cur->name, (const xmlChar *)"name"))) { key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1); printf("name: %s\t", key); xmlFree(key); } //获取tel if ((!xmlStrcmp(cur->name, (const xmlChar *)"tel"))) { key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1); printf("tel: %s\t", key); xmlFree(key); } //获取address if ((!xmlStrcmp(cur->name, (const xmlChar *)"address"))) { key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1); printf("address: %s\n", key); xmlFree(key); } cur = cur->next; } return 0; } static int parse_phone_book(const char *file_name) { assert(file_name); xmlDocPtr doc; //xml整个文档的树形结构 xmlNodePtr cur; //xml节点 xmlChar *id; //phone id //获取树形结构 doc = xmlParseFile(file_name); if (doc == NULL) { fprintf(stderr, "Failed to parse xml file:%s\n", file_name); goto FAILED; } //获取根节点 cur = xmlDocGetRootElement(doc); if (cur == NULL) { fprintf(stderr, "Root is empty.\n"); goto FAILED; } if ((xmlStrcmp(cur->name, (const xmlChar *)"phone_books"))) { fprintf(stderr, "The root is not phone_books.\n"); goto FAILED; } //遍历处理根节点的每一个子节点 cur = cur->xmlChildrenNode; while (cur != NULL) { if ((!xmlStrcmp(cur->name, (const xmlChar *)"phone"))) { id = xmlGetProp(cur, "id"); printf("id:%s\t",id); parse_phone(doc, cur); } cur = cur->next; } xmlFreeDoc(doc); return 0; FAILED: if (doc) { xmlFreeDoc(doc); } return -1; } int main(int argc, char*argv[]) { char *xml_file = DEFAULT_XML_FILE; if (argc == 2) { xml_file = argv[1]; } if (parse_phone_book(xml_file) != 0) { fprintf(stderr, "Failed to parse phone book.\n"); return -1; } return 0; }
编译命令:
gcc -I /usr/include/libxml2 -L /usr/local/lib -lxml2 2.c -o 2
生成的结果如下:
OK 了!!