苗木网站建设短视频seo优化排名
这里的例子都是依据当前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<>里面的内容，如下所示：
下面举个例子：
<?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>目的：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 void8 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 void24 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 int66 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 }下面是代码的编译：
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/libxml2
root@mkx:~/workspace/libxml2/learn.20211112# ls
exampleC exampleC.c story.xml下面是代码的运行情况：
root@mkx:~/workspace/libxml2/learn.20211112# ./exampleC story.xml
keyword: example keyword看，获取了keyword所对应的值：example keyword