Tizen系统LibXML2创建/读取XML文件的代码

流星悟语

有时,您需要使用xml文件,例如设置一些定制的设置以xml格式文件。来看演示吧！

1. #include <libxml/parser.h> // include this header file into your .h file
   
2. 
   
3. void create_xmldoc()
   
4. {
   
5.     xmlDocPtr doc;
   
6.     xmlNodePtr root_node;
   
7. 
   
8.     //new document instance
   
9.     doc = xmlNewDoc(BAD_CAST"1.0");
   
10.     //set root node
    
11.     root_node = xmlNewNode(NULL,BAD_CAST"root");
    
12.     xmlDocSetRootElement(doc,root_node);
    
13. 
    
14.     //create a comment and cdata section
    
15.     xmlNodePtr cdata = xmlNewCDataBlock(doc,BAD_CAST "This is a CData block",xmlStrlen(BAD_CAST "This is a CData block"));
    
16.     xmlAddChild(root_node,cdata);
    
17.     xmlNodePtr comment = xmlNewComment(BAD_CAST "This is a comment node");
    
18.     xmlAddChild(root_node,comment);
    
19. 
    
20.     //create sub-node under the root node
    
21.     xmlNewChild(root_node, NULL, BAD_CAST "newNode1", BAD_CAST "newNode1 content");
    
22.     xmlNewTextChild(root_node, NULL, BAD_CAST "newNode2", BAD_CAST "newNode2 content");
    
23. 
    
24.     //create a node with content and attribute, add to root
    
25.     xmlNodePtr node = xmlNewNode(NULL,BAD_CAST"node2");
    
26.     xmlNodePtr content = xmlNewText(BAD_CAST"NODE CONTENT");
    
27.     xmlAddChild(root_node,node);
    
28.     xmlAddChild(node,content);
    
29.     xmlNewProp(node,BAD_CAST"attribute",BAD_CAST "yes");
    
30. 
    
31.     //create a son and grandson of the root
    
32.     node = xmlNewNode(NULL, BAD_CAST "son");
    
33.     xmlAddChild(root_node,node);
    
34.     xmlNodePtr grandson = xmlNewNode(NULL, BAD_CAST "grandson");
    
35.     xmlAddChild(node,grandson);
    
36.     xmlAddChild(grandson, xmlNewText(BAD_CAST "This is a grandson node"));
    
37. 
    
38.     //create a node with namespace
    
39.     node = xmlNewNode(NULL,BAD_CAST "newNode3");
    
40.     xmlAddChild(root_node,node);
    
41.     xmlNsPtr ns = xmlNewNs(node,BAD_CAST "http://org.tizen.xmldemo/ns/newNode3",BAD_CAST "cns");
    
42.     xmlNodePtr subnode = xmlNewChild(node,ns,BAD_CAST "subNode1",BAD_CAST "subNode1 content");
    
43.     xmlNewNsProp(subnode,ns,BAD_CAST "subNode1Attr",BAD_CAST "subNode1 attribute");
    
44.     subnode = xmlNewNode(ns,BAD_CAST "subNode2");
    
45.     xmlAddChild(node,subnode);
    
46.     xmlNewNsProp(subnode,ns,BAD_CAST "dataType",BAD_CAST "datetime");
    
47.     xmlNewTextChild(subnode,ns,BAD_CAST "date",BAD_CAST "2015-06-10");
    
48. 
    
49.     //save the document
    
50.     int nRel = xmlSaveFile(XML_FILE_NAME,doc);
    
51.     if (nRel != -1)
    
52.     {
    
53.             xmlChar *docstr;
    
54.             int len;
    
55.             xmlDocDumpMemory(doc, &docstr, &len);
    
56.             dlog_print(DLOG_INFO, LOG_TAG, "[create_xmldoc]File length: %d, file content:\n%s", len, docstr);
    
57.     }
    
58. 
    
59.     //memory free
    
60.     xmlFreeDoc(doc);
    
61. }
    
62. 
    
63. void read_xmldoc()
    
64. {
    
65.     xmlDocPtr doc;
    
66.         xmlNodePtr curNode;
    
67.         xmlChar *szKey;
    
68.         xmlChar *szAttr;
    
69.         xmlChar *content;
    
70.         xmlChar *attrVal;
    
71. 
    
72.         // parsing the xml file and return the doc handler(xmlDocPtr)
    
73.         doc = xmlParseFile(XML_FILE_NAME);
    
74.         if (NULL == doc)
    
75.         {
    
76.                 dlog_print(DLOG_INFO, LOG_TAG, "[read_xmldoc]Error in xmlParseFile\n");
    
77.         }
    
78. 
    
79.         //get root element
    
80.         curNode = xmlDocGetRootElement(doc);
    
81.         if (NULL == curNode)
    
82.         {
    
83.                 dlog_print(DLOG_INFO, LOG_TAG, "[read_xmldoc]Error in xmlDocGetRootElement\n");
    
84.         }
    
85.         if (xmlStrcmp(curNode->name, BAD_CAST "root"))
    
86.         {
    
87.            xmlFreeDoc(doc);
    
88.         }
    
89. 
    
90.         // search children by node name
    
91.         szKey = BAD_CAST "node2";
    
92.         szAttr = BAD_CAST "attribute";
    
93.         get_child(curNode, szKey, &content, szAttr, &attrVal);
    
94.         dlog_print(DLOG_INFO, LOG_TAG, "[read_xmldoc]Get node content and attribute, node: %s, content: %s; attribute: %s, attribute value: %s\n",
    
95.                         szKey, content, szAttr, attrVal);
    
96.         xmlFree(content);
    
97.         xmlFree(attrVal);
    
98. 
    
99.         szKey = BAD_CAST "son";
    
100.         curNode = get_child(curNode, BAD_CAST "son", &content, NULL, NULL);
     
101.         dlog_print(DLOG_INFO, LOG_TAG, "[read_xmldoc]Get node content and attribute, node: %s, content: %s\n", szKey, content);
     
102.         xmlFree(content);
     
103.         szKey = BAD_CAST "grandson";
     
104.         get_child(curNode, BAD_CAST "grandson", &content, NULL, NULL);
     
105.         dlog_print(DLOG_INFO, LOG_TAG, "[read_xmldoc]Get node content and attribute, node: %s, content: %s\n", szKey, content);
     
106.         xmlFree(content);
     
107. 
     
108.         xmlFreeDoc(doc);
     
109. }
     
110. 
     
111. static xmlNodePtr
     
112. get_child(xmlNodePtr parent, xmlChar* name, xmlChar** content, xmlChar* attr, xmlChar** attrVal)
     
113. {
     
114.         xmlNodePtr curNode;
     
115.         xmlChar *szContent;
     
116.         xmlChar* szAttr;
     
117. 
     
118.         curNode = parent->xmlChildrenNode;
     
119.         while(curNode != NULL)
     
120.     {
     
121.             // get content of node
     
122.             if ( !xmlStrcmp(curNode->name, name) )
     
123.             {
     
124.                     szContent = xmlNodeGetContent(curNode);
     
125.                 *content = szContent;
     
126.                 break;
     
127.             }
     
128.             curNode = curNode->next;
     
129.     }
     
130. 
     
131.     // get value of attribute if exists
     
132.     if ( curNode != NULL &&
     
133.              attr != NULL &&
     
134.              xmlHasProp(curNode,attr) )
     
135.     {
     
136.         szAttr = xmlGetProp(curNode,attr);
     
137.         *attrVal = szAttr;
     
138.     }
     
139. 
     
140.     return curNode;
     
141. }

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