Question

I’ve fed some MySQL data back to the application by using the code below, of course not everything is there, only what is required. I can’t seem to grab the value of ‘cash’ despite having successfully returned the JSON from my PHP file. I’m using Touch JSON.

Please help?

NSString *urlString = [NSString stringWithFormat:@"http://REMOVED/REMOVED.php?login_key=%@&username=%@",login_key,username];

NSString *strResponse = [self stringWithUrl:[NSURL URLWithString:urlString]];
NSLog(@"%@", strResponse);


NSData *jsonData = [strResponse dataUsingEncoding:NSUTF8StringEncoding];
NSError *error = nil;
NSDictionary *dictionary = [[CJSONDeserializer deserializer] deserializeAsDictionary:jsonData error:&error];
NSLog(@"Cash: %@", [dictionary objectForKey:@"cash"]);

This returns the log below:

2011-05-29 10:10:35.493 test1[623:207] [[[{"uid":"0","username":"admin","password":"REMOVED","email":"REMOVED","cash":"925071","exp":"117500","level":"1","clan":"YES","clanid":"1"}]]]

2011-05-29 10:10:35.495 test1[623:207] Cash: (null)

Answer 1

Your JSON data contains an array as the top-level object, hence you cannot deserialise it as a dictionary:

[
  [
    [
      {
        "cash" : "925071",
        "clan" : "YES",
        "clanid" : "1",
        "email" : "REMOVED",
        "exp" : "117500",
        "level" : "1",
        "password" : "REMOVED",
        "uid" : "0",
        "username" : "admin"
      }
    ]
  ]
]

Try this instead:

NSArray *array = [[CJSONDeserializer deserializer] deserializeAsArray:jsonData
                                                                error:&error];

Also, note that there are three arrays in your JSON data, and only the innermost array contains an object (a dictionary). It’s not clear why there are three nested arrays and what would be the other elements in the arrays, so it’s hard to give a generic parsing solution for your problem. One possibility is:

for (NSArray *innerArray2 in array) {
    for (NSArray *innerArray3 in innerArray2) {
        for (NSDictionary *dictionary in innerArray3) {
            NSString *cash = [dictionary objectForKey:@"cash"];
            NSLog(@"Cash = %@", cash);
        }
    }
}