iPhone JSON Object
- by Cosizzle
Hello,
I'm trying to create a application that will retrieve JSON data from an HTTP request, send it to a the application main controller as a JSON object then from there do further processing with it.
Where I'm stick is actually creating a class that will serve as a JSON class in which will take a URL, grab the data, and return that object.
Alone, im able to make this class work, however I can not get the class to store the object for my main controller to retrieve it.
Because im fairly new to Objective-C itself, my thoughts are that im messing up within my init call:
-initWithURL:(NSString *) value
{
responseData = [[NSMutableData data] retain];
NSString *theURL = value;
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:theURL]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
return self;
}
The processing of the JSON object takes place here:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[connection release];
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
[responseData release];
NSError *jsonError;
SBJSON *json = [[SBJSON new] autorelease];
NSDictionary *parsedJSON = [json objectWithString:responseString error:&jsonError];
// NSArray object.
listings = [parsedJSON objectForKey:@"posts"];
NSEnumerator *enumerator = [listings objectEnumerator];
NSDictionary* item;
// to prove that it does work.
while (item = (NSDictionary*)[enumerator nextObject]) {
NSLog(@"posts:id = %@", [item objectForKey:@"id"]);
NSLog(@"posts:address = %@", [item objectForKey:@"address"]);
NSLog(@"posts:lat = %@", [item objectForKey:@"lat"]);
NSLog(@"posts:lng = %@", [item objectForKey:@"lng"]);
}
[responseString release];
}
Now when calling the object within the main controller I have this bit of code in the viewDidLoad method call:
- (void)viewDidLoad {
[super viewDidLoad];
JSON_model *jsonObj = [[JSON_model alloc] initWithURL:@"http://localhost/json/faith_json.php?user=1&format=json"];
NSEnumerator *enumerator = [[jsonObj listings] objectEnumerator];
NSDictionary* item;
//
while (item = (NSDictionary*)[enumerator nextObject]) {
NSLog(@"posts:id = %@", [item objectForKey:@"id"]);
NSLog(@"posts:address = %@", [item objectForKey:@"address"]);
NSLog(@"posts:lat = %@", [item objectForKey:@"lat"]);
NSLog(@"posts:lng = %@", [item objectForKey:@"lng"]);
}
}
