parsing json feeds into iphone

i was trying to parse public json flickr feed into iphone.i m getting an error..

-JSONValue failed. Error trace is: (
    "Error Domain=org.brautaset.JSON.ErrorDomain Code=3 \"Unrecognised leading character\"开发者_如何学运维 UserInfo=0x4b43100 {NSLocalizedDescription=Unrecognised leading character}"
).....

below is the json feed:

http://api.flickr.com/services/feeds/photos_public.gne?tags=hackdayindia&lang=en-us&format=json.....

i d be so greatful if you guys could help me out

Your response data is not valid JSON because of the jsonFlickrFeed( … ) callback returned by the Flickr API. In order to obtain valid JSON, add nojsoncallback=1 to your query. Using your example, the corresponding URL is:

http://api.flickr.com/services/feeds/photos_public.gne?tags=hackdayindia&lang=en-us&format=json&nojsoncallback=1

If you use the response from the URL above in http://jsonlint.com, it’ll tell you it’s valid JSON.

nojsoncallback is documented in http://www.flickr.com/services/api/response.json.html

A quick example of how to read that response. The top level element of the JSON string is an object, which is usually mapped to a dictionary by JSON parsers:

// Obtain the JSON string from Flickr API
NSString *jsonString = …;

// Parse the JSON string into a dictionary
// (in this example, via SBJSON)
NSDictionary *responseObject = [jsonString JSONValue];

// The dictionary has an entry called "items", which is an array
NSArray *items = [responseObject objectForKey:@"items"];

// Iterate over the items. Each item is an object, hence a dictionary
for (NSDictionary *item in items) {
    // Each item dictionary has an entry called "author_id", which is a string
    NSString *authorId = [item objectForKey:@"author_id"];

    // Log the author id
    NSLog(@"author_id = %@", authorId);
}