Parse JSON String and array with NSJSONSerialization issue?

Question

This is the code i have so far

// Parse data using NSJSONSerialization
NSError *error = nil;
NSArray *JsonArray = [NSJSONSerialization JSONObjectWithData:myData options:NSJSONReadingMutableContainers error: &error];
if(!JsonArray)
{
    NSLog(@"Error Parsing Data: %@", error);
}
else
{
    for(NSDictionary *event in JsonArray)
    {
        if([[event description] isEqualToString:@"error"])
        {
            // Get error number? I am confused by this part
            NSLog(@"Element: %@", [event objectForKey:@"error"]);
        }
        else
        {
            NSLog(@"Element: %@", [event description]);
        }
    }
}

this is the JSON Data that parses correctly:

[{data string}, {data strings}]

This only gives me the string "error" and not the int as well:

{"error":0}

I am echoing this data from a PHP script if that helps any. Am i just doing it wrong, or did i miss something?

Answer 1

Your problem is that when you receive an error, you get back an NSDictionary and not an NSArray. This should work:

if ([jsonObject isKindOfClass:[NSArray class]]) {
    // no error: enumerate objects as you described above
} else if ([jsonObject isKindOfClass:[NSDictionary class]]) {
    // error: obtain error code
    NSNumber *errCode = jsonObject[@"error"];
} else {
    // something bad's happening
}

Stylistic pieces of advice:

1. Don't call your object JsonArray, since it's not always an array. Call it jsonObject.

2. Don't start variable names with capital letters.