Debutant Libxml2 et C recherche de données dans XML

**Mika2008** · 17/02/2011, 22h14

Bonjour,

voila j’aimerais rechercher des données dans un fichier XML, Pour n'en garder que certain.

j'ai regarder des codes d'emple de libxml2, mais ils ne sont pas trés clair.

et je n'est rien trouvé sur comment rechercher une information d'une balise dans un xml.
quelqu'un peut m'aiguiller svp ?

merci @ vous.

**Mika2008** · 17/02/2011, 22h50

Par exemple ce code :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
#include <libxml/parser.h>
#include <libxml/xpath.h>
 
xmlDocPtr
getdoc (char *docname) {
	xmlDocPtr doc;
	doc = xmlParseFile(docname);
 
	if (doc == NULL ) {
		fprintf(stderr,"Document not parsed successfully. \n");
		return NULL;
	}
 
	return doc;
}
 
xmlXPathObjectPtr
getnodeset (xmlDocPtr doc, xmlChar *xpath){
 
	xmlXPathContextPtr context;
	xmlXPathObjectPtr result;
 
	context = xmlXPathNewContext(doc);
	if (context == NULL) {
		printf("Error in xmlXPathNewContext\n");
		return NULL;
	}
	result = xmlXPathEvalExpression(xpath, context);
	xmlXPathFreeContext(context);
	if (result == NULL) {
		printf("Error in xmlXPathEvalExpression\n");
		return NULL;
	}
	if(xmlXPathNodeSetIsEmpty(result->nodesetval)){
		xmlXPathFreeObject(result);
                printf("No result\n");
		return NULL;
	}
	return result;
}
int
main(int argc, char **argv) {
 
	char *docname;
	xmlDocPtr doc;
xmlChar *xpath = (xmlChar*) "//feed//entry//id";
	xmlNodeSetPtr nodeset;
	xmlXPathObjectPtr result;
	int i;
	xmlChar *keyword;
 
	if (argc <= 1) {
		printf("Usage: %s docname\n", argv[0]);
		return(0);
	}
 
	docname = argv[1];
	doc = getdoc(docname);
	result = getnodeset (doc, xpath);
	if (result) {
		nodeset = result->nodesetval;
		for (i=0; i < nodeset->nodeNr; i++) {
			keyword = xmlNodeListGetString(doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);
		printf("keyword: %s\n", keyword);
		xmlFree(keyword);
		}
		xmlXPathFreeObject (result);
	}
	xmlFreeDoc(doc);
	xmlCleanupParser();
	return (1);
}

je travaille sur ce fichier XML :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
<?xml version='1.0' encoding='UTF-8'?>
<feed xmlns='http://www.w3.org/2005/Atom' xmlns:media='http://search.yahoo.com/mrss/' xmlns:openSearch='http://a9.com/-/spec/opensearch/1.1/' xmlns:gd='http://schemas.google.com/g/2005' xmlns:yt='http://gdata.youtube.com/schemas/2007' gd:etag='W/&quot;DEYEQX87fyp7ImA9Wx9UF00.&quot;'>
	<id>tag:youtube.com,2008:videos</id>
	<updated>2011-02-14T17:55:00.107Z</updated>
	<category scheme='http://schemas.google.com/g/2005#kind' term='http://gdata.youtube.com/schemas/2007#video'/>
	<title>YouTube Videos matching query: Ronald Jenkees</title>
	<logo>http://www.youtube.com/img/pic_youtubelogo_123x63.gif</logo>
	<link rel='alternate' type='text/html' href='http://www.youtube.com'/>
	<link rel='http://schemas.google.com/g/2005#feed' type='application/atom+xml' href='http://gdata.youtube.com/feeds/api/videos?v=2'/>
	<link rel='http://schemas.google.com/g/2005#batch' type='application/atom+xml' href='http://gdata.youtube.com/feeds/api/videos/batch?v=2'/>
	<link rel='self' type='application/atom+xml' href='http://gdata.youtube.com/feeds/api/videos?q=Ronald+Jenkees&amp;start-index=1&amp;max-results=2&amp;v=2'/>
	<link rel='service' type='application/atomsvc+xml' href='http://gdata.youtube.com/feeds/api/videos?alt=atom-service&amp;v=2'/>
	<link rel='next' type='application/atom+xml' href='http://gdata.youtube.com/feeds/api/videos?q=Ronald+Jenkees&amp;start-index=3&amp;max-results=2&amp;v=2'/>
	<author>
		<name>YouTube</name>
		<uri>http://www.youtube.com/</uri>
	</author>
	<generator version='2.0' uri='http://gdata.youtube.com/'>YouTube data API</generator>
	<openSearch:totalResults>2715</openSearch:totalResults>
	<openSearch:startIndex>1</openSearch:startIndex>
	<openSearch:itemsPerPage>2</openSearch:itemsPerPage>
	<entry gd:etag='W/&quot;D0ANQX47eCp7ImA9Wx9UFkQ.&quot;'>
		<id>tag:youtube.com,2008:video:smE-uIljiGo</id>
		<published>2008-03-06T18:36:43.000Z</published>
		<updated>2011-02-14T15:03:10.000Z</updated>
		<category scheme='http://schemas.google.com/g/2005#kind' term='http://gdata.youtube.com/schemas/2007#video'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/categories.cat' term='Music' label='Music'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='ronald'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='jenkees'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='unsigned'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='motif'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='XS'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='XS8'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='keyboard'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='guitar'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='jam'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='beat'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='fl'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='studio'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='fruityloops'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='hip-hop'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='solo'/>
		<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat' term='instrumental'/>
		<title>Ronald Jenkees - Guitar Sound</title>
		<content type='application/x-shockwave-flash' src='http://www.youtube.com/v/smE-uIljiGo?f=videos&amp;app=youtube_gdata'/>
		<link rel='alternate' type='text/html' href='http://www.youtube.com/watch?v=smE-uIljiGo&amp;feature=youtube_gdata'/>
		<link rel='http://gdata.youtube.com/schemas/2007#video.responses' type='application/atom+xml' href='http://gdata.youtube.com/feeds/api/videos/smE-uIljiGo/responses?v=2'/>
		<link rel='http://gdata.youtube.com/schemas/2007#video.related' type='application/atom+xml' href='http://gdata.youtube.com/feeds/api/videos/smE-uIljiGo/related?v=2'/>
		<link rel='http://gdata.youtube.com/schemas/2007#mobile' type='text/html' href='http://m.youtube.com/details?v=smE-uIljiGo'/>
		<link rel='self' type='application/atom+xml' href='http://gdata.youtube.com/feeds/api/videos/smE-uIljiGo?v=2'/>
		<author>
			<name>ronaldjenkees</name>
			<uri>http://gdata.youtube.com/feeds/api/users/ronaldjenkees</uri>
			</author>
			<yt:accessControl action='comment' permission='allowed'/>
			<yt:accessControl action='commentVote' permission='allowed'/>
			<yt:accessControl action='videoRespond' permission='moderated'/>
			<yt:accessControl action='rate' permission='allowed'/>
			<yt:accessControl action='embed' permission='allowed'/>
			<yt:accessControl action='list' permission='allowed'/>
			<yt:accessControl action='syndicate' permission='allowed'/>
			<gd:comments>
				<gd:feedLink href='http://gdata.youtube.com/feeds/api/videos/smE-uIljiGo/comments?v=2' countHint='28562'/>
				</gd:comments>
				<media:group>
					<media:category label='Music' scheme='http://gdata.youtube.com/schemas/2007/categories.cat'>Music</media:category>
					<media:content url='http://www.youtube.com/v/smE-uIljiGo?f=videos&amp;app=youtube_gdata' type='application/x-shockwave-flash' medium='video' isDefault='true' expression='full' duration='255' yt:format='5'/>
					<media:content url='rtsp://v2.cache1.c.youtube.com/CiILENy73wIaGQlqiGOJuD5hshMYDSANFEgGUgZ2aWRlb3MM/0/0/0/video.3gp' type='video/3gpp' medium='video' expression='full' duration='255' yt:format='1'/>
					<media:content url='rtsp://v1.cache5.c.youtube.com/CiILENy73wIaGQlqiGOJuD5hshMYESARFEgGUgZ2aWRlb3MM/0/0/0/video.3gp' type='video/3gpp' medium='video' expression='full' duration='255' yt:format='6'/>
					<media:credit role='uploader' scheme='urn:youtube' yt:type='partner'>ronaldjenkees</media:credit>
					<media:description type='plain'>download the MP3: www.ronaldjenkees.com **this tune is on my new CD, Disorganized Fun. I named it Guitar Sound. just havin some fun with a guitar sound (Hard Ramp AS1&amp;2) on the Motif XS8. Some have asked about the "low notes" that come out when I hit those two keys up top - those are guitar effects built in the patch and for whatever reason, Yamaha put those effects on the high keys. I made the background beat using FL Studio. I start the beat by hitting the space-bar on my computer keyboard before I play on the synth. PS. I've read some reviews of this vid as if I'm trying to be a "keytar" player (apparently not a desirable thing, but how can you not like Edgar Winter's "Frankenstein") and that I should just play a real guitar. LOL @ some of those same people who probably play guitar hero (nothing against it but hopefully you see my point)! The irony! The point is, folks, if you find a fun/inspiring sound to jam with, by all means, you should JAM WITH IT! I don't care if you find a $3.00 plastic trumpet. Don't worry about the technicalities and what people say. In the long run it's about the fun that YOU have making music. Thanks for watching!!!</media:description>
					<media:keywords>ronald, jenkees, unsigned, motif, XS, XS8, keyboard, guitar, jam, beat, fl, studio, fruityloops, hip-hop, solo, instrumental</media:keywords>
					<media:player url='http://www.youtube.com/watch?v=smE-uIljiGo&amp;feature=youtube_gdata_player'/>
					<media:thumbnail url='http://i.ytimg.com/vi/smE-uIljiGo/default.jpg' height='90' width='120' time='00:02:07.500' yt:name='default'/>
					<media:thumbnail url='http://i.ytimg.com/vi/smE-uIljiGo/hqdefault.jpg' height='360' width='480' yt:name='hqdefault'/>
					<media:thumbnail url='http://i.ytimg.com/vi/smE-uIljiGo/1.jpg' height='90' width='120' time='00:01:03.750' yt:name='start'/>
					<media:thumbnail url='http://i.ytimg.com/vi/smE-uIljiGo/2.jpg' height='90' width='120' time='00:02:07.500' yt:name='middle'/>
					<media:thumbnail url='http://i.ytimg.com/vi/smE-uIljiGo/3.jpg' height='90' width='120' time='00:03:11.250' yt:name='end'/>
					<media:title type='plain'>Ronald Jenkees - Guitar Sound</media:title>
					<yt:duration seconds='255'/>
					<yt:uploaded>2008-03-06T18:36:43.000Z</yt:uploaded>
					<yt:videoid>smE-uIljiGo</yt:videoid>
					</media:group>
	<yt:statistics favoriteCount='52741' viewCount='7247365'/>
	</entry>
	<entry gd:etag='W/&quot;DkMBRn47eCp7ImA9Wx9UFkQ.&quot;'>
						<id>tag:youtube.com,2008:video:0O2aH4XLbto</id>
						<published>2008-08-05T21:56:54.000Z</published>
						<updated>2011-02-14T14:40:57.000Z</updated>
						<category scheme='http://schemas.google.com/g/2005#kind' term='http://gdata.youtube.com/schemas/2007#video'/>
						<category scheme='http://gdata.youtube.com/schemas/2007/categories.cat' term='Music' label='Music'/>
						<title>Ronald Jenkees - Throwing Fire</title>
						<content type='application/x-shockwave-flash' src='http://www.youtube.com/v/0O2aH4XLbto?f=videos&amp;app=youtube_gdata'/>
						<link rel='alternate' type='text/html' href='http://www.youtube.com/watch?v=0O2aH4XLbto&amp;feature=youtube_gdata'/>
						<link rel='http://gdata.youtube.com/schemas/2007#video.responses' type='application/atom+xml' href='http://gdata.youtube.com/feeds/api/videos/0O2aH4XLbto/responses?v=2'/>
						<link rel='http://gdata.youtube.com/schemas/2007#video.related' type='application/atom+xml' href='http://gdata.youtube.com/feeds/api/videos/0O2aH4XLbto/related?v=2'/>
						<link rel='http://gdata.youtube.com/schemas/2007#mobile' type='text/html' href='http://m.youtube.com/details?v=0O2aH4XLbto'/>
						<link rel='self' type='application/atom+xml' href='http://gdata.youtube.com/feeds/api/videos/0O2aH4XLbto?v=2'/>
						<author>
							<name>ronaldjenkees</name>
							<uri>http://gdata.youtube.com/feeds/api/users/ronaldjenkees</uri>
							</author>
							<yt:accessControl action='comment' permission='allowed'/>
							<yt:accessControl action='commentVote' permission='allowed'/>
							<yt:accessControl action='videoRespond' permission='moderated'/>
							<yt:accessControl action='rate' permission='allowed'/>
							<yt:accessControl action='embed' permission='allowed'/>
							<yt:accessControl action='list' permission='allowed'/>
							<yt:accessControl action='syndicate' permission='allowed'/>
							<gd:comments>
								<gd:feedLink href='http://gdata.youtube.com/feeds/api/videos/0O2aH4XLbto/comments?v=2' countHint='28675'/>
								</gd:comments>
								<media:group>
									<media:category label='Music' scheme='http://gdata.youtube.com/schemas/2007/categories.cat'>Music</media:category>
									<media:content url='http://www.youtube.com/v/0O2aH4XLbto?f=videos&amp;app=youtube_gdata' type='application/x-shockwave-flash' medium='video' isDefault='true' expression='full' duration='190' yt:format='5'/>
									<media:content url='rtsp://v4.cache2.c.youtube.com/CiILENy73wIaGQnabsuFH5rt0BMYDSANFEgGUgZ2aWRlb3MM/0/0/0/video.3gp' type='video/3gpp' medium='video' expression='full' duration='190' yt:format='1'/>
									<media:content url='rtsp://v2.cache1.c.youtube.com/CiILENy73wIaGQnabsuFH5rt0BMYESARFEgGUgZ2aWRlb3MM/0/0/0/video.3gp' type='video/3gpp' medium='video' expression='full' duration='190' yt:format='6'/>
									<media:credit role='uploader' scheme='urn:youtube' yt:type='partner'>ronaldjenkees</media:credit>
									<media:description type='plain'>Throwing Fire is on my 2nd CD, Disorganized Fun: www.ronaldjenkees.com SUPER FUN TIME WITH THIS JAM!!!! Thanks a lot for watching! Hope you liked it. Kindof a rough cut, but it's always fun. This video is dedicated to the band Papa Roach for letting me check out their studio and giving me a place to stay in LA. Those are some hard-working rockers and good guys. I got cold chills listening to the songs they're working on for their new album. I think it's coming out really soon. My friend Sam gave me the hat I'm wearing in this vid. It's made of 100% recycled material. Can't beat that. Here's their site: www.livity.org I'm using FL Studio software to make the beat in the background and a Korg Triton Le keyboard on top, Motif XS8 on bottom.</media:description>
									<media:keywords/>
									<media:player url='http://www.youtube.com/watch?v=0O2aH4XLbto&amp;feature=youtube_gdata_player'/>
									<media:thumbnail url='http://i.ytimg.com/vi/0O2aH4XLbto/default.jpg' height='90' width='120' time='00:01:35' yt:name='default'/>
									<media:thumbnail url='http://i.ytimg.com/vi/0O2aH4XLbto/hqdefault.jpg' height='360' width='480' yt:name='hqdefault'/>
									<media:thumbnail url='http://i.ytimg.com/vi/0O2aH4XLbto/1.jpg' height='90' width='120' time='00:00:47.500' yt:name='start'/>
									<media:thumbnail url='http://i.ytimg.com/vi/0O2aH4XLbto/2.jpg' height='90' width='120' time='00:01:35' yt:name='middle'/>
									<media:thumbnail url='http://i.ytimg.com/vi/0O2aH4XLbto/3.jpg' height='90' width='120' time='00:02:22.500' yt:name='end'/>
									<media:title type='plain'>Ronald Jenkees - Throwing Fire</media:title>
									<yt:duration seconds='190'/>
									<yt:uploaded>2008-08-05T21:56:54.000Z</yt:uploaded>
									<yt:videoid>0O2aH4XLbto</yt:videoid>
									</media:group>
									<yt:statistics favoriteCount='52285' viewCount='6488178'/>
</entry>
</feed>

en théorie dans le code C je lui demande de m'afficher le contenue de la balise //feed//entry//id
xmlChar *xpath = (xmlChar*) "//feed//entry//id";

quand ke lance le programme il met me no result ?
alors qu'il aurait du m'afficher :
tag:youtube.com,2008:video:smE-uIljiGo
ce que contient la balise //feed/entry/if

qu'en pensez vous svp ?

**Erwy** · 18/02/2011, 07h20

je ne connais pas bien cette bibliotheque mais, le problème vient sans doute que tu utilises un namespace (non préfixé pour tout arrangé).

xmlns='http://www.w3.org/2005/Atom'
Et il faudrait le passer en paramètre à ta fonction

Pour ce que j'ai trouvé sur le web essaye quelque chose comme

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

 getnodeset (doc, xpath,'http://www.w3.org/2005/Atom')

**Mika2008** · 18/02/2011, 16h35

merci de ta réponse, mais ce le ne fonctionne pas :

dans mon code je met ceci :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

xmlChar *xpath = (xmlChar*) "http://www.w3.org/2005/Atom";

ce qui me donne comme résultat :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
 
XPath error : Invalid expression
http://www.w3.org/2005/Atom
     ^
XPath error : Invalid expression
http://www.w3.org/2005/Atom
     ^
Error in xmlXPathEvalExpression

**Mika2008** · 18/02/2011, 19h38

j'ai trouvé ce petit article :

http://xmlsoft.org/namespaces.html

mais c'est pas trés claire?

**Mika2008** · 19/02/2011, 00h30

j'ai trouvé un début de réponse ici :

urns out, as I found out from here, it is not really a failure of libXml, it's a problem because libXml correctly follows the XML/XPATH specifications.

The solutions proposed by R Bourdeau are correct, however, if you have control of the xml document you are parsing.

The context for the XPATH query is independent of the namespace qualifiers in the xml document. The default namespace forces all child tags into a namespace; they don't require qualification in the document but must be qualified in the xpath query. Fortunately, you registered the namespace as new with libXml, so cateof's solution should work.

xmlXPathRegisterNs(context, BAD_CAST "new", BAD_CAST "http://www.example.com/new"

xmlChar *xpath = (xmlChar*) "/new:book/new:section1";
I'm inlining the xml here for visibility:

<?xml version="1.0" encoding="UTF-8"?>
<book xmlns="http://www.example.com/new">
<section1>Sec_1</section1>
<section2>Sec_2</section2>
</book>

par contre les balises comme ceci je n'arrive pas à extraire la donnée, le programme ne trouve pas cette balise :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

<yt:videoid>

par exemple si je tape cette recherche :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

xmlChar *xpath_id_video= (xmlChar*) "/feed:feed/feed:entry/feed:media/feed:group/feed:yt/feed:videoid";

je continue à chercher

**thelvin** · 21/02/2011, 10h18

Ce serait plutôt :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

/feed:feed/feed:entry/feed:media/feed:group/yt:videoid

Et bien sûr il faut register yt de la même manière que tu as déjà registered feed.

**Mika2008** · 24/02/2011, 21h11

merci, voici la réponse final a mon problème :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
 
#include <stdio.h>
#include <stdlib.h>
#include <libxml/parser.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>
#include <Eina.h>
#include "constante.h"
#include "url_utils.h"
#include <stdio.h>
#include <curl/curl.h>
 
xmlDocPtr
getdoc (char *docname) {
	xmlDocPtr doc;
	doc = xmlParseFile(docname);
 
	if (doc == NULL ) {
		fprintf(stderr,"Document not parsed successfully. \n");
		return NULL;
	}else
		printf("Document parsed successfully. \n");	
 
 
	return doc;
}
 
xmlXPathObjectPtr
getnodeset (xmlDocPtr doc, xmlChar *xpath){
 
	xmlXPathContextPtr context;
	xmlXPathObjectPtr result;
 
	context = xmlXPathNewContext(doc);
 
 
	xmlXPathRegisterNs(context,  BAD_CAST "feed", BAD_CAST "http://www.w3.org/2005/Atom");
	xmlXPathRegisterNs(context,  BAD_CAST "media", BAD_CAST "http://search.yahoo.com/mrss/");
	xmlXPathRegisterNs(context,  BAD_CAST "yt", BAD_CAST "http://gdata.youtube.com/schemas/2007");
 
	if (context == NULL) {
		printf("Error in xmlXPathNewContext\n");
		return NULL;
	}
	result = xmlXPathEvalExpression(xpath, context);
	xmlXPathFreeContext(context);
	if (result == NULL) {
		printf("Error in xmlXPathEvalExpression\n");
		return NULL;
	}
	if(xmlXPathNodeSetIsEmpty(result->nodesetval)){
		xmlXPathFreeObject(result);
                printf("No result\n");
		return NULL;
	}
	return result;
}
 
Eina_List *
result_data_flux(char *docname, xmlChar *xpath )
{
 
	xmlDocPtr doc;
	xmlNodeSetPtr nodeset;
	xmlXPathObjectPtr result;
	int i;	 
	xmlChar *keyword;
	Eina_List *list = NULL;
 
	doc = getdoc(docname);
	result = getnodeset (doc, xpath);
		eina_init();
 
	if (result) {
		nodeset = result->nodesetval;
		for (i=0; i < nodeset->nodeNr; i++) {
			keyword = xmlNodeListGetString(doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);
			//printf("keyword: %s\n", keyword);
			list = eina_list_append(list, keyword);  
 
		}
		xmlXPathFreeObject (result);
	}
	else
		printf("Result is NULL\n");
 
	xmlFreeDoc(doc);
 
	return list;
}
 
void
afficheEListe_xmlchar(Eina_List *lt)
{
	Eina_List  *l = NULL;
	xmlChar *data;
	eina_init();
 
  EINA_LIST_FOREACH(lt, l, data)
	printf("argument : %s\n", data); //Contenu de l'adresse data !
 
  //Libére notre list
  lt = eina_list_free(lt);
}
 
Eina_List *find_lt_author(char *docname)
{	
	Eina_List  *lt_author_name = NULL;
 
	xmlChar *xpath_autheur_name = (xmlChar*) "/feed:feed/feed:entry/feed:author/feed:name";
 
	lt_author_name =  result_data_flux(docname,xpath_autheur_name);
 
	xmlCleanupParser();
 
	return lt_author_name;
 
 
}
 
Eina_List * find_lt_video_id(char *docname)
{
		Eina_List  *lt_video_title = NULL;
 
	xmlChar *xpath_id_video= (xmlChar*) "/feed:feed/feed:entry/media:group/yt:videoid";  
 
	lt_video_title =  result_data_flux(docname,xpath_id_video);
 
	xmlCleanupParser();
 
	return lt_video_title;
}
 
 
Eina_List * find_lt_video_title(char *docname)
{
		Eina_List  *lt_video_title = NULL;
 
		xmlChar *xpath_video_title = (xmlChar*) "/feed:feed/feed:entry/feed:title";
 
	lt_video_title =  result_data_flux(docname,xpath_video_title);
 
	xmlCleanupParser();
 
	return lt_video_title;
}
 
 
 
xmlDocPtr
get_xml_doc_from_memory (char *buffer)
{
    xmlDocPtr doc = NULL;
 
    if (!buffer)
        return NULL;
 
    doc = xmlReadMemory (buffer, strlen (buffer), NULL, NULL,
                         XML_PARSE_RECOVER |
                         XML_PARSE_NOERROR | XML_PARSE_NOWARNING);
    return doc;
}
 
 
 
Eina_List *
lt_data_video(const char *recherche)
{
 
	eina_init();
	Eina_List *lt_author_name = NULL, *lt_video_title = NULL, *lt_video_id = NULL;
	Eina_List  *lt_video = NULL;
 
	//récupartion du flux en mémoire
	//utilisation de url_utils.	
//char *url = "http://gdata.youtube.com/feeds/api/videos?q=ronald+jenkins&orderby=published&start-index=11&max-results=10&v=2";
 
	///////////////////////////////////////////////////
	///////////////////////////////////////////////////
 
 
 
	///////////////////////////////////////////////////
	///////////////////////////////////////////////////
 
 
 
 
printf("recherche = %s\n",recherche);
  CURL *curl;
  CURLcode res;
 
  curl = curl_easy_init();
 
  if(curl) {
 
    curl_easy_setopt(curl, CURLOPT_URL, recherche);
 
    FILE * fp = fopen("./liste.xml", "w"); 
	curl_easy_setopt(curl,  CURLOPT_WRITEDATA, fp); 
	curl_easy_setopt(curl,  CURLOPT_WRITEFUNCTION, fwrite);
	curl_easy_perform(curl);
	fclose(fp);
	curl_easy_cleanup(curl);
	}
    else {
    res = curl_easy_perform(curl);
 
    /* always cleanup */ 
    curl_easy_cleanup(curl);
	}
 
 
  char *doc = "liste.xml";
 
 
 
		//fin utilisation du 
 
lt_author_name =  find_lt_author(doc);
lt_video_title = find_lt_video_id(doc);
lt_video_id = find_lt_video_title(doc);
 
 
	xmlChar *data_author, *data_video_title,* data_video_id;
	struct cf_video *o_video;
	eina_init();
	int i =0;
 
	for (i=0;i< eina_list_count(lt_video_title);i++)
	{
	o_video = (struct cf_video*)malloc(sizeof(struct cf_video));	
 
		data_author = eina_list_data_get(lt_author_name);
		data_video_title = eina_list_data_get(lt_video_title);
		data_video_id = eina_list_data_get(lt_video_id);
 
 
		o_video->video_title =  data_video_title;
		o_video->video_id  =  data_video_id;
		o_video->author_name  =  data_author;
		//printf("%d , author_name : %s, video_title : %s, video_id : %s\n",i,o_video->author_name,o_video->video_title, o_video->video_id); //Contenu de l'adresse data !
		lt_video = eina_list_append(lt_video, o_video);
 
 
 
		//permet de passer a la donnée suivante
		lt_video_id = eina_list_next (lt_video_id);
		lt_author_name = eina_list_next (lt_author_name);
		lt_video_title = eina_list_next (lt_video_title);
 
 
	}
 
 
	return lt_video;
}

Debutant Libxml2 et C recherche de données dans XML

XSL/XSLT/XPATH XML

Discussions similaires

Partager

Partager