libxml 关关键字解析xml文件的例子

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demo.xml文件内容如下：

<?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>

demo.c代码：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>

void parseStory(xmlDocPtr doc,xmlNodePtr cur){
xmlChar *key;
cur=cur->xmlChildrenNode;
while(cur!=NULL){
  if( (!xmlStrcmp(cur->name,(const xmlChar*)"keyword")) ){
   key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
   printf("keyword: %s/n", key);
     xmlFree(key);
  }
  cur = cur->next;
}
return;
}

static void parseDoc(char *docname){
xmlDocPtr doc;
xmlNodePtr cur;
doc=xmlParseFile(docname);
if(doc==NULL){
  fprintf(stderr,"Document not parsed successfully. /n");
  return;
}
cur = xmlDocGetRootElement(doc);
if(cur==NULL){
  fprintf(stderr,"empty document/n");
  xmlFreeDoc(doc);
  return;
}
if (xmlStrcmp(cur->name, (const xmlChar *) "story")) {
  fprintf(stderr,"document of the wrong type, root node != story");
  xmlFreeDoc(doc);
  return;
}
cur = cur->xmlChildrenNode;
while (cur != NULL) {
  if ((!xmlStrcmp(cur->name, (const xmlChar *)"storyinfo"))){
   parseStory (doc, cur);
  }
  cur = cur->next;
}

xmlFreeDoc(doc);
return;
}

int main(int argc,char **argv){
char *docname;
if(argc<=1){
printf("Usage: %s docname/n", argv[0]);
return(0);
}
docname=argv[1];
parseDoc(docname);
return (1);
}

解译命令：

gcc -o demo demo.c -I/home/oracle/libxmldemo -lxml2

执行命令：

./demo demo.xml