这里的例子都是根据以后libxml2的官网上的

官网地址如下：

Libxml Tutorial

这一个例子，实现了，从xml当中获取关键字的内容，关键字，对应着xml<>外面的内容，如下所示：

上面举个例子：

<?xml version="1.0"?><story>  <storyinfo>    <author>John Fleck</author>    <datewritten>June 2, 2002</datewritten>    <keyword>example keyword</keyword>  </storyinfo>  <body>    <headline>This is the headline</headline>    <para>This is the body text.</para>  </body></story>

 目标：获取name为“keyword”，所对应的值，或者说是字符串：“example keyword”

具体代码实现如下：

  1 #include <stdio.h>  2 #include <string.h>  3 #include <stdlib.h>  4 #include <libxml/xmlmemory.h>  5 #include <libxml/parser.h>  6   7 void  8 parseStory (xmlDocPtr doc, xmlNodePtr cur) {  9  10   xmlChar *key; 11   cur = cur->xmlChildrenNode; 12   while (cur != NULL) { 13       if ((!xmlStrcmp(cur->name, (const xmlChar *)"keyword"))) { 14         key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1); 15         printf("keyword: %s\n", key); 16         xmlFree(key); 17       } 18   cur = cur->next; 19   } 20     return; 21 } 22  23 static void 24 parseDoc(char *docname) { 25  26   printf("enter function parseDoc\r\n"); 27   xmlDocPtr doc; 28   xmlNodePtr cur; 29  30   doc = xmlParseFile(docname); 31  32   if (doc == NULL ) { 33     fprintf(stderr,"Document not parsed successfully. \n"); 34     return; 35   } 36    37   cur = xmlDocGetRootElement(doc); 38    39   if (cur == NULL) { 40     fprintf(stderr,"empty document\n"); 41     xmlFreeDoc(doc); 42     return; 43   }  44    45   if (xmlStrcmp(cur->name, (const xmlChar *) "story")) { 46     fprintf(stderr,"document of the wrong type, root node != story"); 47     xmlFreeDoc(doc); 48     return; 49   }  50    51   cur = cur->xmlChildrenNode; 52   while (cur != NULL) { 53     if ((!xmlStrcmp(cur->name, (const xmlChar *)"storyinfo"))){ 54       parseStory (doc, cur); 55     }  56       57   cur = cur->next; 58   } 59    60   xmlFreeDoc(doc); 61   printf("exit function parseDoc\r\n"); 62   return; 63 }  64  65 int 66 main(int argc, char **argv) { 67  68   char *docname; 69  70   if (argc <= 1) { 71     printf("Usage: %s docname\n", argv[0]); 72     return(0); 73   } 74  75   docname = argv[1]; 76   parseDoc (docname); 77  78   return (1); 79 }

上面是代码的编译：

root@mkx:~/workspace/libxml2/learn.20211112# gcc -o exampleC exampleC.c -L/usr/local/lib -lxml2 -L/usr/local/lib -lz -lm -ldl -I/usr/local/include/libxml2root@mkx:~/workspace/libxml2/learn.20211112# lsexampleC  exampleC.c  story.xml

上面是代码的运行状况：

root@mkx:~/workspace/libxml2/learn.20211112# ./exampleC story.xml keyword: example keyword

看，获取了keyword所对应的值：example keyword