CODEWITHSUNDEEP
objective-ciosios5grand-central-dispatchnsurlrequest
Firdous
Firdous

Reputation: 4652

Using multithreading for loading JSON data

I want to load JSON data through multithreading and parse it to NSDictionary, have done it previously using TWRequest class for twitter feeds, How can I use NSURLRequest to do the same as:

TWRequest *request = [[TWRequest alloc] initWithURL:[NSURL URLWithString: @"https://api.twitter.com/1/statuses/public_timeline.json?screen_name=firdous_ali86&include_entities=true"] parameters:nil requestMethod:TWRequestMethodGET];

    // Notice this is a block, it is the handler to process the response
    [request performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error)
     {
         if ([urlResponse statusCode] == 200) 
         {
             tweetCollection = [[NSMutableArray alloc] init];
             Tweet *tweet;
             NSError *error;  

             NSArray *dict = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&error];
         }
    }];

problem is that NSURLRequest doesnt implement performRequestWithHandler method.

Upvotes: 0

Views: 1380

Answers (4)

Firdous
Firdous

Reputation: 4652

i used:

#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) //1
#define kLatestKivaLoansURL [NSURL URLWithString: @"http://my_service_url"] //2

- (void)viewDidLoad
{   
    myCollection = [[NSMutableArray alloc] init];

    [super viewDidLoad];

    dispatch_async(kBgQueue, ^{
        NSData* data = [NSData dataWithContentsOfURL: 
                        kLatestKivaLoansURL];
        NSError* error;
        NSDictionary* jsonDict = [NSJSONSerialization 
                                  JSONObjectWithData:data //1
                                  options:kNilOptions 
                                  error:&error];

        NSArray* myArray = [jsonDict objectForKey:@"response"]; //2

        NSEnumerator *myIterator = [myArray objectEnumerator];
        id anObject;

        Cast *cast;

        while( anObject = [myIterator nextObject])
        {
            cast = [[Cast alloc] init];    
            cast.castTitle = [anObject objectForKey:@"castTitle"];

            [myCollection addObject:cast];
        }
        [myTableView reloadData];
    });
}

Upvotes: 0

Julien
Julien

Reputation: 973

You can use NSURLConnection with the method:

+ (void)sendAsynchronousRequest:(NSURLRequest *)request queue:(NSOperationQueue *)queue completionHandler:(void (^)(NSURLResponse*, NSData*, NSError*))handler

Upvotes: 1

TeaCupApp
TeaCupApp

Reputation: 11452

you can always create a delegate and let that delegate to call back after completion, Or use connection did finish loading delegate method of NSURLConnection to process twitter response. Or the best idea is to use ASIHTTPRequest or AFNetwork framework to make request async and then do JSON parsing

Upvotes: 1

dbrajkovic
dbrajkovic

Reputation: 3703

Here is my most popular answer of the week. Look at Apple's docs. https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/URLLoadingSystem/URLLoadingSystem.html#//apple_ref/doc/uid/10000165i

The answer is right in there.

Does anyone actually read the documentation before coming to stack overflow?

Upvotes: -1

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