Yeah, it was the fact that the CLLocationDegrees in the CLLocationCoordinate2D 
struct were doubles, or that CLLocationCoordinate2D was a struct.

The other possibility might be if the mapView.annotations array  is nil 
terminated, that might cause the premature death.

Rebuilt the string and recreated the array and it's fine.  

Still think that NSJSONSerialization dataWithJSONObject:jAnnotations 
options:NSJSONWritingPrettyPrinted error:&error should throw an error rather 
than just crashing.  Seems odd to have the error option there, but not usable.


On Apr 19, 2012, at 10:14 AM, Alex Zavatone wrote:

> I'm wondering if there are any hard and fast basic rules on why an 
> NSDictionary or NSArray would not be pass the [NSJSONSerialization 
> isValidJSONObject: jDict]
> test.
> 
> According to the docs, isValidJSONObject:, returns a Boolean value that 
> indicates whether a given object can be converted to JSON data, so I assume 
> I'm using this correctly.
> 
> I'm trying to output my mapKit annotation list to a JSON file and I'm rather 
> surprised that the annotation list (even when added to a dictionary key as an 
> object) fails to pass the test. 
> 
> At this point, unless there's something simple, it will actually be faster to 
> walk the dictionary myself.
> 
> Thanks in advance.
> 
> - Alex Zavatone
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