CODEWITHSUNDEEP
objective-cjsonapiafnetworking-2khan-academy
Joel
Joel

Reputation: 1635

Khan Academy Topic Tree Not Working -Objective C and AFNetworking 2.0

I am attempting to call the khan academy api inside my iOS app. I am using the AFNetworking class to make the api call. Here is my code:

           AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer = [AFJSONResponseSerializer serializer];
manager.requestSerializer = [AFJSONRequestSerializer serializer];

[manager GET:@"http://www.khanacademy.org//api/v1/topictree" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
    [activityIndicator stopAnimating];
    NSLog(@"no error");
    for (NSString *key in [responseObject allKeys]) {
        NSLog(@"%@", [responseObject objectForKey:key]);
    }


} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"error");
    [activityIndicator stopAnimating];
    NSLog(@"Error Khan: %@", [error localizedDescription]);
}];

When I visited http://www.khanacademy.org//api/v1/topictree it was a very long list. I have a hunch it may be the JSON parsing because I am only getting one NSDictionary. As you can see in the code above I used Fast Enumeration to view the values and the keys.

If that is the correct parse. I have no idea which keys to use to get a list of all the topics. Then when a user clicks on the topic I want to show a list of the video then I need to access the video download url specific to mp4. I could do it in the playlist list method however it has been deprecated.

The goal of this is to be able to view a list if topics followed by the topics videos followed by the video description then its downloadable url in mp4 format.

I have also been getting the error Error Khan:

The operation couldn’t be completed. (Cocoa error 3840.)

But some of the time it works.

All help is appreciated.

Thanks in advance,

Joel

Upvotes: 0

Views: 252

Answers (1)

Luca Iaco
Luca Iaco

Reputation: 3457

that error code means JSON text did not start with array or object and option to allow fragments not set.

because response json from server is not a valid json for retireve array or object. Try using

NSJSONReadingAllowFragments

NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData options: NSJSONReadingAllowFragments error:&error];


NSLog(@"response: %@ error: %@", json, error);

Upvotes: 0

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