Manipulating Facebook/JSON data - objective-c

Question

I'm trying to handle Facebook JSON data and transform it into a NSMutable Dictionary, but I'm getting (null) when I try to print the data. Although when I try to do a count, I get a number.
User_likes is NSMutableDictionary which is globally defined. I'm getting (null) on this line:
NSLog(#"User likes: %#", user_likes);
This is my code:
NSString *query =
#"SELECT page_id, type FROM page_fan WHERE uid = me() ";
// Set up the query parameter
NSDictionary *queryParam = #{ #"q": query };
// Make the API request that uses FQL
[FBRequestConnection startWithGraphPath:#"/fql"
parameters:queryParam
HTTPMethod:#"GET"
completionHandler:^(FBRequestConnection *connection,
id results,
NSError *error) {
if (error) {
NSLog(#"Error: %#", [error localizedDescription]);
} else {
user_likes = [NSJSONSerialization JSONObjectWithData:results options:kNilOptions error:&error];
NSLog(#"User likes: %#", user_likes);
NSInteger* n_user_likes = [results count];
NSInteger* n_user_likes2 = [user_likes count];
NSLog(#"n user likes %qi", n_user_likes);
NSLog(#"n user likes2 %qi", n_user_likes2);
id val = nil;
id values = [[user_likes allKeys] objectAtIndex:0 ];
NSLog(#"values id %#", values);
When I print results, I get a lot of data from Facebook, this is a sample of it:
data = (
{
"page_id" = 253370381511811;
type = "PUBLIC FIGURE";
},
{
"page_id" = 148389618201;
type = "LOCAL BUSINESS";
},
{
"page_id" = 213631462169238;
type = COMMUNITY;
},
{
"page_id" = 162297750451425;
type = "NON-PROFIT ORGANIZATION";
},
{
"page_id" = 503620106320217;
type = "MEDIA/NEWS/PUBLISHING";
},

Answer 1

you can't do directly
user_likes = [NSJSONSerialization JSONObjectWithData:results options:kNilOptions error:&error];
you need first create a dictionary with the data in results like this:
NSDictionary *dictionary = [NSDictionary dictionaryWithJSONData:results];
user_likes = [NSString stringWithFormat:#"%d",[[dictionary objectForKey:#"value_of_the_likes"] intValue]];
NSLog(#"%#",user_likes);
NSLog(#"%#",dictionary);
EDIT:
Please, create this class to your project and import in the class where you need use this.
#import <Foundation/Foundation.h>
#interface NSDictionary (JSONExtensions)
+(NSDictionary*)dictionaryWithJSONData:(NSData*)data;
-(NSData*)JSONValue;
-(NSString*)JSONString;
#end
#implementation NSDictionary(JSONExtensions)
+(NSDictionary*)dictionaryWithJSONData:(NSData*)data{
NSError *error = nil;
NSDictionary *result = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
if(error){
NSLog(#"%#",error);
return nil;
};
return result;
}
-(NSData*)JSONValue{
NSError *error = nil;
NSData *result = [NSJSONSerialization dataWithJSONObject:self options:kNilOptions error:&error];
if(error){
NSLog(#"%#",error);
return nil;
};
return result;
}
-(NSString*)JSONString{
return [[NSString alloc] initWithData:self.JSONValue encoding:NSUTF8StringEncoding];
}
#end
Hope it can help you.

Answer 2

maybe you forget set up options:
NSJSONReadingOptions options = NSJSONReadingAllowFragments | NSJSONReadingMutableContainers | NSJSONReadingMutableLeaves;
user_likes = [NSJSONSerialization JSONObjectWithData:results options:options error:&error];
i hope this be useful for you!
UPDATE:
Check this :
NSJsonSerialzation not parsing results from Facebook - Cocoa error 3840
Let me know if that helps you!