Accessing JSON data inside an NSDictionary generated from NSJSONSerialization - objective-c

Question

Having some trouble accessing the JSON data in the following URL ( http://jamesstenson.com/portraits/?json=1 ), basically I want to access the "full" "url"'s underneath "attachments". My code at the moment is as follows:
NSError *e = nil;
NSData *jsonFeed = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://jamesstenson.com/portraits/?json=1"]];
NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:jsonFeed options:NSJSONReadingMutableContainers error: &e];
if (!jsonData) {
NSLog(#"Error parsing JSON: %#", e);
} else {
for(NSDictionary *item in [jsonData objectForKey:#"page"]) {
for(NSDictionary *attachment in [item objectForKey:#"images"]) {
NSLog(#"%#", attachment);
}
}
}
This keeps throwing up an error:
2011-12-21 10:13:39.362 JSON[3463:f803] -[__NSCFString objectForKey:]: unrecognized selector sent to instance 0x6a7b500
2011-12-21 10:13:39.363 JSON[3463:f803] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString objectForKey:]: unrecognized selector sent to instance 0x6a7b500'
I am aware I am accessing the items wrongly, but cannot figure out how to achieve this. I've tried several solutions such as http://blogs.captechconsulting.com/blog/nathan-jones/getting-started-json-ios5 - but no luck. I am complete newbie to iOS development and have a little knowledge of JSON. Thanks for everyones help in advance.

Answer 1

The problem is in you for loop
for(NSDictionary *item in [jsonData objectForKey:#"page"])
You won't get NSDictionary in item, it will return you key of Dictionary, which would be NSString
Check this link for each loop in objective c for accessing NSMutable dictionary to know how to traverse through NSDictionay
Below is the modified code for your requirement, might help you
if (!jsonData) {
NSLog(#"Error parsing JSON: %#", e); } else {
NSArray *attachments = [[jsonData objectForKey:#"page"] objectForKey:#"attachments"];
for(NSDictionary *object in attachments) {
NSLog(#"%#", [object objectForKey:#"images"]);
NSLog(#"%#", [[[object objectForKey:#"images"] objectForKey:#"full"] objectForKey:#"url"]);
}
}