Linux ------- XPath对xml解析

mytomorrow

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• #ifndef CONF_XML_H
• #define CONF_XML_H
• // xml文件Z在《Linux下获取xml调试信息等级》里有
• #include <stdio.h>
• #include <string.h>
• #include <unistd.h>
• #include <assert.h>
• #include <libxml/parser.h>
• #include <libxml/tree.h>
• #include <libxml/xmlmemory.h>
• #include <libxml/xpath.h>
• #define ROOT "root" //根节点
• #define SON_1 "can0" //儿子节点1
• #define SON_2 "can1" //儿子节点2
• #define GRAND_SON "tag" //孙子节点
• #define GRAND_SON_ATTR "id"
• #define GREAT_GRANDSON_1 "attr" //曾孙节点1
• #define GREAT_GRANDSON_2 "goods" //曾孙节点2
• #define ID_STR_LEN        16
• #define NAME_STR_LEN      32
• #define TEL_STR_LEN       16
• #define ADDR_STR_LEN      128
• // xml结点结构体
• typedef struct can_t
• {
•   int id;                   // 编号
•   char attr[NAME_STR_LEN];  //
•   char goods[TEL_STR_LEN];  //
• } can;
• int ConfAddNode(char *son, int id, char *attr, char *goods);
• int ConfDelNode(char *son, int id);
• xmlXPathObjectPtr ConfGetNode(xmlDocPtr doc, xmlChar *xpath);
• #endif
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• #include "conf_xml.h"
• #include "conf_debug.h"
• static int find_sub_node(xmlNodePtr root, char *son, int id, char *attr, char *goods)
• {
•   xmlNodePtr cur = NULL, cur_grandson = NULL;
•   char cur_id[ID_STR_LEN] = {0};
•   snprintf(cur_id, ID_STR_LEN, "%d", id);
•   cur = root->xmlChildrenNode;
•   while(cur != NULL)
•   {
•     if ((!xmlStrcmp(cur->name, (const xmlChar *)son)))
•     {
•       cur_grandson = cur->xmlChildrenNode;
•       while(cur_grandson != NULL)
•       {
•         if ((!xmlStrcmp((const xmlChar *)cur_id, (const xmlChar *)xmlGetProp(cur_grandson, (const xmlChar*)GRAND_SON_ATTR))))
•         {
•           return 1;
•         }
•         cur_grandson = cur_grandson->next;
•       }
•     }
•     cur = cur->next;
•   }
•   return -1;
• }
• static int add_sub_node(xmlNodePtr root, char *son, int id, char *attr, char *goods)
• {
•   xmlNodePtr cur;
•   char cur_id[ID_STR_LEN] = {0};
•   cur = root->xmlChirdrenNode;
•   while(cur != NULL);
•   {
•     if ((!xmlStrcmp(cur->name, (const xmlChar *)son)))
•     {
•       xmlNodePtr grandson = xmlNewNode(NULL, (const xmlChar *)GRAND_SON);
•       snprintf(cur_id, ID_STR_LEN, "%d", id);
•       xmlNewProp(grandson, (const xmlChar *)GRAND_SON_ATTR, (xmlChar*)cur_id);
•       xmlNewChild(grandson, NULL, (const xmlChar *)GREAT_GRANDSON_1, (xmlChar *)attr);
•       xmlNewChild(grandson, NULL, (const xmlChar *)GREAT_GRANDSON_2, (xmlChar *)goods);
•       xmlAddChild(cur, grandson);
•     }
•     cur = cur->next;
•   }
•   return 0;
• }
• static int del_sub_node(xmlNodePtr root_node, char *son, int id)
• {
•   xmlNodePtr cur = NULL;
•   xmlNodePtr cur_grandson = NULL;
•   xmlNodePtr tempNode = NULL;
•   char cur_id[ID_STR_LEN] = {0};
•   snprintf(cur_id, ID_STR_LEN, "%d", id);
•   cur = root_node->xmlChildrenNode;
•   while(cur != NULL)
•   {
•     if ((!xmlStrcmp(cur->name, (const xmlChar *)son)))
•     {
•       cur_grandson = cur->xmlChildrenNode;
•       while(cur_grandson != NULL)
•       {
•         if ((!xmlStrcmp((const xmlChar *)cur_id, (const xmlChar *)xmlGetProp(cur_grandson, (const xmlChar*)GRAND_SON_ATTR))))
•         {
•           tempNode = cur_grandson->next;
•           xmlUnlinkNode(cur_grandson);
•           xmlFreeNode(cur_grandson);
•           cur_grandson = tempNode;
•           continue;
•         }
•         cur_grandson = cur_grandson->next;
•       }
•     }
•     cur = cur->next;
•   }
•   return 0;
• }
• int ConfAddNode(char * son, int id, char * attr, char * goods)
• {
•   assert(CONF_FILE_NAME);
•   xmlDocPtr doc = NULL;
•   xmlNodePtr root = NULL;
•   doc = xmlReadFile(CONF_FILE_NAME, "UTF-8", 256); //解析文件
•   if (doc == NULL)
•   {
•     fprintf(stderr, "Failed to parser xml file:%s\n", CONF_FILE_NAME);
•     return -1;
•   }
•   root = xmlDocGetRootElement(doc);
•   if (root == NULL)
•   {
•     fprintf(stderr, "Failed to get root node.\n");
•     goto FAILED;
•   }
•   /*先查找有没有在同一个端口上有同一个id号的出现，如果有，就不要加入了，因为原来就有这个ID*/
•   if (find_sub_node(root, son, id, attr, goods) == 1)
•   {
•     xmlSaveFormatFileEnc(CONF_FILE_NAME, doc, "UTF-8", 1);
•     xmlFreeDoc(doc);
•     return 0;
•   }
•   if (add_sub_node(root, son, id, attr, goods) != 0)
•   {
•     fprintf(stderr, "Failed to add a new can node.\n");
•     goto FAILED;
•   }
•   //将文档保存到文件中，按照utf-8编码格式保存
•   xmlSaveFormatFileEnc(CONF_FILE_NAME, doc, "UTF-8", 1);
•   xmlFreeDoc(doc);
•   return 1;
• FAILED:
•   if (doc)
•   {
•     xmlFreeDoc(doc);
•   }
•   return -1;
• }
• int ConfDelNode(char * son, int id)
• {
•   assert(CONF_FILE_NAME);
•   xmlDocPtr doc = NULL;
•   xmlNodePtr root = NULL;
•   doc = xmlReadFile(CONF_FILE_NAME, "UTF-8", 256); //解析文件
•   if (doc == NULL)
•   {
•     fprintf(stderr, "Failed to parser xml file:%s\n", CONF_FILE_NAME);
•     return -1;
•   }
•   root = xmlDocGetRootElement(doc);
•   if (root == NULL)
•   {
•     fprintf(stderr, "Failed to get root node.\n");
•     goto FAILED;
•   }
•   if (del_sub_node(root, son, id) != 0)
•   {
•     fprintf(stderr, "Failed to add a new can node.\n");
•     goto FAILED;
•   }
•   //将文档保存到文件中，按照utf-8编码格式保存
•   xmlSaveFormatFileEnc(CONF_FILE_NAME, doc, "UTF-8", 1);
•   xmlFreeDoc(doc);
•   return 0;
• FAILED:
•   if (doc)
•   {
•     xmlFreeDoc(doc);
•   }
•   return -1;
• }
• xmlXPathObjectPtr ConfGetNode(xmlDocPtr doc, xmlChar * xpath)
• {
•   xmlXPathContextPtr context;
•   xmlXPathObjectPtr result;
•   context = xmlXPathNewContext(doc);
•   if (context == NULL)
•   {
•     printf("context is NULL\n");
•     return NULL;
•   }
•   result = xmlXPathEvalExpression(xpath, context);
•   xmlXPathFreeContext(context);
•   if (result == NULL)
•   {
•     printf("xmlXPathEvalExpression return NULL\n");
•     return NULL;
•   }
•   if (xmlXPathNodeSetIsEmpty(result->nodesetval))
•   {
•     xmlXPathFreeObject(result);
•     printf("nodeset is empty\n");
•     return NULL;
•   }
•   return result;
• }
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