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/libxml2
root@mkx:~/workspace/libxml2/learn.20211112# ls
exampleC 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