Exception when reading JSON result

Question

I am trying to parse the following JSON response: http://www.breakingnews.com/api/v5/items?compact=false.

Here is my code to parse it:

NSError* error = nil;
NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.breakingnews.com/api/v5/items?compact=false"] options:NSDataReadingUncached error:&error];
if (error) {
    NSLog(@"%@", [error localizedDescription]);
} else {

    NSError *e = nil;
    NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData: data options:kNilOptions error: &e];

    if (!jsonArray) {
        NSLog(@"Error parsing JSON: %@", e);
    } else {
        for(NSArray* item in jsonArray) {

            NSLog(@"Item: %@", item);

        }
    }

}

However, I'm getting this error:

-[__NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x101810a40

Why is this - what am I doing wrong?

That guy made the **exact same mistake.** And several others did so. You should search before asking. — , Apr 20 '13 at 20:29
The only strange thing is the alleged error message - I don't see a NSString in that code. Actually this code does not crash, it just displays the keys of the dictionary. Did you show all relevant code? — Martin R, Apr 20 '13 at 20:33
I actually checked that code and it does not crash, it just does not show the expected result because (spoiler!) your JSON response is a dictionary and not an array. — Martin R, Apr 20 '13 at 20:38
“Array” doesn't mean the same thing in Cocoa and in C as it does in some other languages: an array is a strictly serial collection of items, accessed by index (position in the series). An “associative array”, as some languages call it, is, in Cocoa, called a dictionary. `[…]` is an array; `{…}` is a dictionary. — Peter Hosey, Apr 20 '13 at 22:57

score 2 · Answer 1 · answered Apr 20 '13 at 20:45

2

Check the types of the objects you're using. You're assuming that everything is an NSArray, when in fact things in JSON can be NSArray, NSDictionary, NSString, NSNumber, and NSNull.

answered Apr 20 '13 at 20:45

drewmm

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Exception when reading JSON result

1 Answers1