XML解析

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XML是一种非常重要的文件格式，由于C++对XML的支持非常完善，cocos2d-x选择XML作为主要的文件存储格式。在cocos2d-x中集成了libxml2来解析XML数据。

定义一个用于解析的类，这个类继承CCSAXDelegator和CCObject，然后实现CCSAXDelegator的纯虚函数。

源文件

#include"XMLAnalysis.h"
3. XMLAnalysis::XMLAnalysis(intlength)
4. {
5. CCSAXParserparser;//定义解析
6. if(parser.init("UTF-8")==0)//不是utf-8就不解析了
7. CCLog("pleaseuseutf-8");
8. return;
9. }
10. parser.setDelegator(this);//设置解析的对象，这样就会调用解析的方法
11. parser.parse(data,length);
12. }
13. XMLAnalysis::XMLAnalysis(char*filename)
14. CCSAXParserparser;
15. if(parser.init("UTF-8")==0)
16. CCLog("pleaseuseutf-8");
17. return;
18. parser.setDelegator(this);
19. parser.parse(filename);
20. XMLAnalysis::~XMLAnalysis(void)
21. voidXMLAnalysis::startElement(char**atts)
22. if(strcmp(name,"root"))
23. rootname=name;
24. voidXMLAnalysis::textHandler(intlen)
25. stringstr=string(s,len);
26. if(rootname!="")
27. CCLog("%s",str.c_str());
28. voidXMLAnalysis::endElement(char*name)
29. rootname="";
30. }

这样每次就打印出标签的内容。

下面使用CURL联网，从网络获取XML来解析，至于CURL联网的配置，请查看我的上一篇文章【Cocos2d-x游戏引擎开发笔记(24)】CURL实现get和post联网。定义一个静态变量std::string str;用于保存网络数据

staticstringstr;

在源文件中：

std::stringHelloWorld::str;

在按钮的点击事件中，开始联网：

voidHelloWorld::menuCloseCallback(CCObject*pSender)
1. str="";
2. //usePost();
3. useGet();
4. XMLAnalysis*p=newXMLAnalysis(str.c_str(),strlen(str.c_str())); //XMLAnalysis*p=newXMLAnalysis("xmltemp.xml");//解析文件
5. deletep;
6. }

这里联网是阻塞的，所以调用useGet之后，全部数据获得之后才开始解析的。下面是useGet的实现：

voidHelloWorld::useGet()
1. CURL*curl;
2. CURLcoderes;
3. curl=curl_easy_init();
4. if(curl)
5. curl_easy_setopt(curl,CURLOPT_URL,"http://dota.uuu9.com/rss.xml");
6. curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,writehtml);
7. res=curl_easy_perform(curl);
8. if(res!=CURLE_OK)
9. CCLog("联网超时%i",res);
10. curl_easy_cleanup(curl);
11. else
12. CCLog("curlisnull");
13. }

在writehtml函数中，将返回的数据全部保存到str中

size_tHelloWorld::writehtml(uint8_t*ptr,87); background-color:inherit; font-weight:bold">size_tsize,87); background-color:inherit; font-weight:bold">size_tnumber,153); background-color:inherit; font-weight:bold">void*stream)
1. char*buffer=newchar[16*1024+1];
2. memset(buffer,16*1024+1);
3. sprintf(buffer,"%s",ptr);
4. CCLog("datalengthis%d",strlen(buffer));
5. CCLog("size*numberis%i",size*number);
6. //CCLog("%s",ptr);
7. str=str+buffer;
8. delete[]buffer;
9. returnsize*number;//这里一定要放回实际返回的字节数
10. }

这里我测试过，最大返回16k的数据，C Style字符串规定，最后一个字节是,所以多出一个字节存放。下面是从游久返回的数据，已经全部解析出来了：

1. DOTA
2. 专题站-游久(U9)网-DOTA6.66-DOTA6.67-DOTA6.66B-AI-DOTA-地图下载
3. http://dota.uuu9.com/
4. 最专业的DOTA专题站，提供最全面最新的地图下载,大型英雄专题,英雄模拟器，录像，战报，攻略。最新,最快,最全,一切尽在DOTA.UUU9.COM
5. zh-CN
6. http://dota.uuu9.com/rss.xml
7. [视频]小满食尸鬼:笑容如何从脸上消失的
8. //dota.uuu9.com/201306/101447.shtml
9. 您还没有安装flash播放器,请点击这里安装
10. 2013-6-199:23:24
11. //dota.uuu9.com/201306/101447.shtml
12. [视频]黑曼巴出品:曼巴时刻top10第十二弹
13. //dota.uuu9.com/201306/101446.shtml
14. 您还没有安装flash播放器,请点击这里安装
15. 2013-6-199:17:19
16. //dota.uuu9.com/201306/101446.shtml
17. [视频]凯文教你打Carry:团战之王幽鬼
18. //dota.uuu9.com/201306/101445.shtml
19. 2013-6-199:07:31
20. //dota.uuu9.com/201306/101445.shtml
21. [视频]WGT现场pis采访:暂不考虑征战DOTA2
22. //dota.uuu9.com/201306/101444.shtml
23. 2013-6-1818:49:37
24. //dota.uuu9.com/201306/101444.shtml
25. [视频]Ks夫妻二人套路黑:拍拍与lion的故事
26. //dota.uuu9.com/201306/101443.shtml
27. 2013-6-1818:25:39
28. //dota.uuu9.com/201306/101443.shtml
29. [视频]抱抱熊出品:DOTA意识流特比拼VOL.38
30. //dota.uuu9.com/201306/101438.shtml
31. 2013-6-1817:02:51
32. //dota.uuu9.com/201306/101438.shtml
33. [视频]丶没有bi要出品:操作集锦第六期
34. //dota.uuu9.com/201306/101434.shtml
35. 2013-6-1811:15:52
36. //dota.uuu9.com/201306/101434.shtml
37. [视频]抱抱熊出品:DOTA集锦每周TOP7第55期
38. //dota.uuu9.com/201306/101433.shtml
39. 2013-6-1811:02:16
40. //dota.uuu9.com/201306/101433.shtml
41. [视频]ECL小组赛:OrangevsRstars回顾
42. //dota2.uuu9.com/201306/446153.shtml
43. 2013-6-1810:36:35
44. //dota2.uuu9.com/201306/446153.shtml
45. [视频]专访GTL西北赛区线下赛嘉宾ZSMJ
46. //dota2.uuu9.com/201306/446152.shtml
47. 2013-6-1810:11:22
48. //dota2.uuu9.com/201306/446152.shtml
49. [视频]AlienwareCupLGDvsDK两场回顾
50. //dota2.uuu9.com/201306/446139.shtml
51. 2013-6-189:45:41
52. //dota2.uuu9.com/201306/446139.shtml
53. [视频]游久DOTA精彩集锦第一期:影魔时刻
54. //dota.uuu9.com/201306/101427.shtml
55. 2013-6-188:43:42
56. //dota.uuu9.com/201306/101427.shtml
57. [图赏]WGT颁奖图赏Pis,Maybe高举奖杯
58. //dota.uuu9.com/201306/101425.shtml
59. 2013-6-1717:15:49
60. //dota.uuu9.com/201306/101425.shtml
61. [视频]牛蛙DOTA1/2拍拍熊:超神霸气的杀戮
62. //dota.uuu9.com/201306/101423.shtml
63. 2013-6-1715:45:31
64. //dota.uuu9.com/201306/101423.shtml
65. [视频]水友制作娱乐视频:蛋疼镜头集锦124期
66. //dota.uuu9.com/201306/101419.shtml
67. 2013-6-1714:54:53
68. //dota.uuu9.com/201306/101419.shtml
69. [视频]ZEAM出品教父制作:捣塔冷笑话第五弹
70. //dota.uuu9.com/201306/101417.shtml
71. 2013-6-1714:41:16
72. //dota.uuu9.com/201306/101417.shtml
73. [视频]浅雪dota:教大家打先手(纯属娱乐)
74. //dota.uuu9.com/201306/101421.shtml
75. 2013-6-1712:15:43
76. //dota.uuu9.com/201306/101421.shtml
77. [视频]WGT总决赛Greedy战胜LJBF视频回顾
78. //dota.uuu9.com/201306/101413.shtml
79. WGT线下赛总决赛GreedyVSLJBF
80. 2013-6-1711:45:02
81. //dota.uuu9.com/201306/101413.shtml
82. [视频]彩笔制作:DOTA反杀集锦Top10第64期
83. //dota.uuu9.com/201306/101412.shtml
84. 2013-6-1711:31:17
85. //dota.uuu9.com/201306/101412.shtml
86. [视频]DotA搞笑视频:论演员自我修养第五期
87. //dota.uuu9.com/201306/101411.shtml
88. 2013-6-1711:05:58
89. //dota.uuu9.com/201306/101411.shtml
90. [视频]每周DOTA搞笑镜头:FunnyTOP10第78期
91. //dota.uuu9.com/201306/101410.shtml
92. 2013-6-1710:57:31
93. //dota.uuu9.com/201306/101410.shtml
94. [视频]小乖第一视角:酣畅淋漓的影魔二连发
95. //dota.uuu9.com/201306/101409.shtml
96. 2013-6-179:42:07
97. //dota.uuu9.com/201306/101409.shtml
98. [视频]Nada从顶单排10:中单巫医与中单流浪
99. //dota.uuu9.com/201306/101408.shtml
100. 2013-6-179:33:45
101. //dota.uuu9.com/201306/101408.shtml
102. [视频]P神怒秀sfWGT胜者组GreedyvsPMM
103. //dota.uuu9.com/201306/101402.shtml
104. WGT胜者组决赛GreedyvsPMM视频回顾
105. 2013-6-1612:32:10
106. //dota.uuu9.com/201306/101402.shtml
107. [视频]满楼水平第一视角:跳刀沙王就是干
108. //dota.uuu9.com/201306/101405.shtml
109. 2013-6-1612:28:48
110. //dota.uuu9.com/201306/101405.shtml
111. [视频]ks从1800单排9-11:火女,女王,毒狗
112. //dota.uuu9.com/201306/101404.shtml
113. 2013-6-1612:22:02
114. //dota.uuu9.com/201306/101404.shtml
115. [视频]直播回顾浅浅打野斧王第一视角
116. //dota.uuu9.com/201306/101401.shtml
117. 2013-6-1611:54:02
118. //dota.uuu9.com/201306/101401.shtml
119. [视频]DOTA直播回顾:天使焦先知第一视角
120. //dota.uuu9.com/201306/101400.shtml
121. 2013-6-1611:48:13
122. //dota.uuu9.com/201306/101400.shtml
123. [图赏]WGT2013现场图赏PIS再战职业首秀
124. //dota.uuu9.com/201306/101393.shtml
125. 2013-6-1514:30:08
126. //dota.uuu9.com/201306/101393.shtml
127. [视频]小满鱼人第一视角:重回高手房匹配
128. //dota.uuu9.com/201306/101392.shtml
129. 2013-6-1513:14:32
130. //dota.uuu9.com/201306/101392.shtml
131. [视频]舞儿蓝猫第一视角:劣势局飘逸逆袭
132. //dota.uuu9.com/201306/101391.shtml
133. 2013-6-1513:09:42
134. //dota.uuu9.com/201306/101391.shtml
135. [视频]凯文教你打Carry:4V5的翻盘小黑
136. //dota.uuu9.com/201306/101385.shtml
137. 2013-6-150:43:04
138. //dota.uuu9.com/201306/101385.shtml
139. [视频]Ks从1800单排7-8:老虎,先知无剧透
140. //dota.uuu9.com/201306/101382.shtml
141. 2013-6-1416:51:55
142. //dota.uuu9.com/201306/101382.shtml
143. [视频]820dota第一视角:6.78新版暴力武士
144. //dota.uuu9.com/201306/101377.shtml
145. 2013-6-1414:25:53
146. //dota.uuu9.com/201306/101377.shtml
147. [视频]09从零单排第二季41-42:山岭黑鸟
148. //dota.uuu9.com/201306/101376.shtml
149. 2013-6-1414:13:57
150. //dota.uuu9.com/201306/101376.shtml
151. [视频]Zero_C出品:极限反杀Top10臂章特辑
152. //dota.uuu9.com/201306/101372.shtml
153. 2013-6-1410:24:41
154. //dota.uuu9.com/201306/101372.shtml
155. [视频]牛蛙月骑第一视角:拉远古极限FARM
156. //dota.uuu9.com/201306/101370.shtml
157. 2013-6-149:30:59
158. //dota.uuu9.com/201306/101370.shtml
159. [视频]Nada从顶单排9:撼地神牛第一视角
160. //dota.uuu9.com/201306/101369.shtml
161. 2013-6-149:22:33
162. //dota.uuu9.com/201306/101369.shtml
163. [视频]Ks水友赛第一周:天差地别的两盘给跪
164. //dota.uuu9.com/201306/101368.shtml
165. 2013-6-149:15:24
166. //dota.uuu9.com/201306/101368.shtml
167. [视频]小乖顶端的开始7:激情影魔小鱼合集
168. //dota.uuu9.com/201306/101364.shtml
169. 2013-6-1316:12:29
170. //dota.uuu9.com/201306/101364.shtml

这里我感觉到有点奇怪，这里解析出来的数据比服务器返回的数据要少。以前我在做Android解析XML的时候也是仅仅解析出来了一半，不过使用纯java的话，是可以全部解析出来的。这应该是从游久返回的数据有问题，我解析从自己搭建的服务器返回的数据是完美的。

一般情况下我是要上传工程的源代码的，这次上传出了问题，过几天再上传吧。

（编辑：李大同）

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