#ifndef CONF_XML_H #define CONF_XML_H // xml文件Z在《Linux下獲取xml調(diào)試信息等級》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" //根節(jié)點 #define SON_1 "can0" //兒子節(jié)點1 #define SON_2 "can1" //兒子節(jié)點2 #define GRAND_SON "tag" //孫子節(jié)點 #define GRAND_SON_ATTR "id" #define GREAT_GRANDSON_1 "attr" //曾孫節(jié)點1 #define GREAT_GRANDSON_2 "goods" //曾孫節(jié)點2#define ID_STR_LEN 16 #define NAME_STR_LEN 32 #define TEL_STR_LEN 16 #define ADDR_STR_LEN 128// xml結(jié)點結(jié)構(gòu)體 typedef struct can_t {int id; // 編號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
#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;}/*先查找有沒有在同一個端口上有同一個id號的出現(xiàn)，如果有，就不要加入了，因為原來就有這個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;}//將文檔保存到文件中，按照utf-8編碼格式保存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;}//將文檔保存到文件中，按照utf-8編碼格式保存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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