Handle JSON object return null in iPhone

Question

I have to used JSON web Services for Login Validation, If Data become send is true then i catch it but How Can i handle if i get's null, Is there any method to compare null object ?

my code is like this

  NSMutableDictionary *jons =[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSLog(@"%@",jons);

NSMutableArray *rnameary = [jons  objectForKey:@"posts"];
NSLog(@" rname Arry is : %@",rnameary );

NSLog(@" Rname count is %d",[rnameary count]);

if([rnameary isEqual:[NSNull class]]) {
   NSLog(@"%d",[rnameary count]);
}

output if Valied user

2012-03-23 12:30:58.353 [1503:f803]  rname Arry is : (
    {
    IsDoctor = 1;
    PHCIDF = 3;
    UserIDP = 9;
    UserName = Manoj;
    isAdmin = 0;
}

)

output is invalied user

2012-03-23 12:29:40.944 [1481:f803]  rname Arry is : (
"<null>"

)

i can tell u one thing that my rnnameary is the type of posts ary — ravi, Mar 23 '12 at 06:55

score 1 · Answer 1 · answered Mar 23 '12 at 06:41

1

If you could post JSON data it would be easier to identify problem, but my first guess is that object for key "posts" is not an array.

answered Mar 23 '12 at 06:41

ksh

1,894
19
20

if i fetch valied username and pass then is's work – ravi Mar 23 '12 at 06:45
no, if i print josn dictionary than is's kind of post array the output is posts = ( "" ); – ravi Mar 23 '12 at 06:50

score 1 · Answer 2 · answered Mar 23 '12 at 08:31

1

check this out(i think it should work):

if(rnameary){
     //your stuff here
}

answered Mar 23 '12 at 08:31

Harshit Gupta

1,200
12
27

Handle JSON object return null in iPhone

2 Answers2