IOS 5 JSON Parsing with sub level - iphone

Question

I Try to parse a Json feed with IOS 5.
My Json File is like that :
{
"status": "ok",
"count": 18,
"count_total": 2248,
"pages": 125,
"posts": [
{
"id": 31781,
"type": "post",
"slug": "aaa",
"url": "http:\/\/www.example.com\/videos\/aaa.html",
"status": "publish",
"title": "my Title",
"title_plain": "My Title",
"content": "<p>Jdfkdfkjkjdfklfdkldfkldfklfkdld.<\/p>\n",
"excerpt": "Jdfkdfkjkjdfklfdkldfkldfklfkdlds.",
"date": "2012-01-26 07:38:29",
"modified": "2012-01-26 07:38:29",
"categories": [
{
"id": 4,
"slug": "videos",
"title": "Videos",
"description": "",
"parent": 0,
"post_count": 476
}
],
"tags": [],
"author": {
"id": 4,
"slug": "author",
"name": "Au Thor",
"first_name": "",
"last_name": "",
"nickname": "Au Thor",
"url": "",
"description": ""
},
"attachments": [
{
"id": 31784,
"url": "http:\/\/www.example.com\/wp-content\/uploads\/2012\/01\/primo.jpg",
"slug": "primo",
"title": "primo",
"description": "",
"caption": "",
"parent": 31781,
"mime_type": "image\/jpeg",
"images": {
"full": {
"url": "http:\/\/www.example.com\/wp-content\/uploads\/2012\/01\/primo.jpg",
"width": 620,
"height": 389
},
"thumbnail": {
"url": "http:\/\/www.example.com\/wp-content\/uploads\/2012\/01\/primo-150x75.jpg",
"width": 150,
"height": 75
},
"medium": {
"url": "http:\/\/www.example.com\/wp-content\/uploads\/2012\/01\/primo.jpg",
"width": 620,
"height": 389
},
"large": {
"url": "http:\/\/www.example.com\/wp-content\/uploads\/2012\/01\/primo.jpg",
"width": 620,
"height": 389
}
}
}
],
"comment_count": 1,
"comment_status": "open",
"thumbnail": "http:\/\/www.example.com\/wp-content\/uploads\/2012\/01\/primo-150x75.jpg"
},
I have access to Title, content... like that :
NSArray* latestArticles = [json objectForKey:#"posts"];
NSDictionary* Article = [latestArticles objectAtIndex:0];
NSString *Titre = [Article objectForKey:#"title"];
But how I can have access to attachement > image > full > url field ?
I'm lost, and new with JSON...
Thanks for your help

Answer 1

Haven't testest but I believe it would be.
NSArray *allPosts = [json objectForKey:#"posts"];
NSDictionary *firstPost = [allPosts objectAtIndex:0];
NSArray *allAttachments = [firstPost objectForKey:#"attachments"];
NSDictionary *firstAttachment = [allAttachments objectAtIndex:0];
NSDictionary *allImages = [firstAttachment objectForKey:#"images"];
NSDictionary *fullImage = [allImages objectForKey:#"full"];
NSString *urlString = [fullImage objectForKey:#"url"];
With NSJSONSerialization if you see [] the object will be an NSArray, if you see {} the object will be an NSDictionary.

Answer 2

You can also get it by
NSArray *posts=json[#"posts"];
NSDictionary *newArticle=posts[0];
NSString *title=newArticle[#"title"];
Remember Objective-c is actually c language with object oriented concepts. You can apply basic c code or basic c syntax too. :)