json - Trying to get data from URL returns data is nil in objective c -

i currentley trying retrieve data link: http://steamcommunity.com/market/priceoverview/?country=us&currency=3&appid=730&market_hash_name=%e2%98%85%20bayonet

i want data link outputs when go , click it.

here current code:

nsdata *data = [[nsdata alloc] initwithcontentsofurl:[nsurl urlwithstring:@"http://steamcommunity.com/market/priceoverview/?country=us&currency=3&appid=730&market_hash_name=★%20bayonet"]];  nsdictionary *test = [nsjsonserialization jsonobjectwithdata:data options:kniloptions error:&error]; nslog(@"%@", test[@"lowest_price"]); 

but currentley returns error:

*** terminating app due uncaught exception 'nsinvalidargumentexception', reason: 'data parameter nil' 

i think has star involved in url string, have solution this?

your original url, in example code, malformed.

first, here's code works:

#import <foundation/foundation.h>  int main(int argc, char *argv[]) {     @autoreleasepool {         nserror *error = nil;          // note: pruned original '%20' in example -- partially escaped strings         //   difficult deal with.         nsstring *urlstring = @"http://steamcommunity.com/market/priceoverview/?country=us&currency=3&appid=730&market_hash_name=★ bayonet";          // now, escape entire string         nsurl *url = [nsurl urlwithstring:[urlstring stringbyaddingpercentescapesusingencoding:nsutf8stringencoding]];         // looks         nslog(@"%@", [url absolutestring]);         // http://steamcommunity.com/market/priceoverview/?country=us&currency=3&appid=730&market_hash_name=%e2%98%85%20bayonet          // run         nsdata *data = [[nsdata alloc] initwithcontentsofurl:url];         nsdictionary *test = [nsjsonserialization jsonobjectwithdata:data options:kniloptions error:&error];         nslog(@"%@", test[@"lowest_price"]);         //129,99&#8364;         // data weird me, looks appropriate.     } } 

first, didn't attempt escape string before using it. initwithstring: docs state:

this method expects urlstring contain characters allowed in formed url. other characters must percent escaped. percent-escaped characters interpreted using utf-8 encoding.

so, that. however, original string in sample code "partially escaped". if escaped url, you'd end with:

http://steamcommunity.com/market/priceoverview/?country=us&currency=3&appid=730&market_hash_name=%e2%98%85%2520bayonet 

instead of

http://steamcommunity.com/market/priceoverview/?country=us&currency=3&appid=730&market_hash_name=%e2%98%85%20bayonet 

... can see, '%20' escaped '%2520'.

i hope helps. cheers.