App gets crashed because object at index is beyond empty array

Question

I am accessing data from the json web services into my application. whenever there is no json data the app gets crashed, I am using nsjsonserialization is there anyway I can find out the empty array at response itself and display the error, thus not making app gets crashed.

Check once your response data. If response data have some length then only apply NSJson serialisation. — Bhumeshwer katre, Nov 29 '13 at 06:02

score 1 · Accepted Answer · answered Nov 29 '13 at 06:06

1

try this . . . .

NSArray * dataArray = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

if (dataArray != nil) {

     // perform parsing
}

answered Nov 29 '13 at 06:06

Shaik Riyaz

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score 1 · Answer 2 · answered Nov 29 '13 at 06:13

1

If you want to check if it is empty:

 if ([myMutableArray count] != 0) { ... }

If you want to check if the variable is nil:

 if (myMutableArray) { ... }

or:

 if (myMutableArray != nil) { ... }

answered Nov 29 '13 at 06:13

Pradhyuman sinh

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Kumar KL · Answer 3 · 2013-11-29T06:17:57.857

0

The Exception as expected.. Try the condition whether it has the JSon Value Or Not :

Something like this :

 UserDetails = [NSJSONSerialization JSONObjectWithData:returnData options:0 error:nil];
 NSLog(@"User Det %@", UserDetails);

 if (!UserDetails){ 
     NSLog(@"Doesn't exist");
 }else{ 
     NSlog(@"%@",[UserDetails objectForKey:@"lastName"]);
        .....
 }

edited Nov 29 '13 at 06:17

answered Nov 29 '13 at 06:03

Kumar KL

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score 0 · Answer 4 · answered Nov 29 '13 at 06:15

Check if data is nil or if any error occurred or data length

[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
        {
            NSInteger responseCode = [(NSHTTPURLResponse *)response statusCode];
                NSLog(@"responseCode: %d", responseCode);  //check response code

            if ([data length] > 0 && error == nil)

              //data downloaded -> continue
             NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];

            else if ([data length] == 0 && error == nil)
                //empty reply
            else if (error != nil && error.code == ERROR_CODE_TIMEOUT)
               // time out
            else if (error != nil)
                //error
        }];

App gets crashed because object at index is beyond empty array

4 Answers4