NSURLconnection和json

Question

i know this is a stupid question but i d'ont know how to do that. from this link the requested link is possible to return json data with NSURLconnection ? I hope some one check this link and tell me if is this possible because i am new in this stuff.

EDIT:

i tried with NSJSONSerialization

- (void)viewDidLoad
{
    NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.goalzz.com/main.aspx?region=-1&area=6&update=true"]];
    connectionData = [[NSURLConnection alloc]initWithRequest:req delegate:self];
    [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
 }
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    Data = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [Data appendData:data];
}

 - (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSError *jsonParsingError = nil;
id object = [NSJSONSerialization JSONObjectWithData:Data options:0 error:&jsonParsingError];

if (jsonParsingError) {
    NSLog(@"JSON ERROR: %@", [jsonParsingError localizedDescription]);
} else {
    NSLog(@"OBJECT: %@", [object class]);
}
}

and I get this error message in the console :

JSON ERROR: The operation couldn't be completed. (Cocoa error 3840.)

Answer 1

As the comment above suggests, that link doesn't return JSON. However, assuming you do have such a link, you can use the NSJSONSerialization class to parse JSON data into objective-C classes:

http://developer.apple.com/library/ios/#documentation/Foundation/Reference/NSJSONSerialization_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40010946

Combine this with NSURLConnection and you can do what you ask. Here's a walk through on implementing NSURLConnection:

http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/URLLoadingSystem/Tasks/UsingNSURLConnection.html#//apple_ref/doc/uid/20001836-BAJEAIEE

And here's an outline of what you'd need. Obviously this is not working code:

- (void)downloadJSONFromURL {
    NSURLRequest *request = ....
    NSURLConnection *urlConnection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];
    // ...
}

NSMutableData *urlData;

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    urlData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [urlData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSError *jsonParsingError = nil;
    id object = [NSJSONSerialization JSONObjectWithData:urlData options:0 error:&jsonParsingError];

    if (jsonParsingError) {
        DLog(@"JSON ERROR: %@", [jsonParsingError localizedDescription]);
    } else {
        DLog(@"OBJECT: %@", [object class]);
    }
}