Well, I had a similar problem saving the information to a JSON file and had to
rebuild the dictionary without the CLLocationCoordinate2D struct, before
NSJSONSerialization would serialize the dictionary.
The reason I think it's a struct is that's how it's defined in CLLocation.h and
right now in the debugger, annotation is showing as (struct objc_object *
const), which sorta conflicts with what you wrote (TTBOMK).
Here are the details from CLLocation.h:
/*
* CLLocationCoordinate2D
*
* Discussion:
* A structure that contains a geographical coordinate.
*
* Fields:
* latitude:
* The latitude in degrees.
* longitude:
* The longitude in degrees.
*/
typedef struct {
CLLocationDegrees latitude;
CLLocationDegrees longitude;
} CLLocationCoordinate2D;
On May 8, 2012, at 5:27 PM, Jens Alfke wrote:
>
> On May 8, 2012, at 2:08 PM, Alex Zavatone wrote:
>
>> I've noticed problems before with structs and NSJSONSerializaion.
>> I was trying to write out a dictionary (or array) of the contents of
>> mapView.annotations, yet writeDictToFile fails, while it writes a simple
>> dict just fine.
>> Is there a problem with the structs within the annotations, namely, the
>> CLLocationCoordinate2D struct for each annotation, that prevents this from
>> being able to be written out to a dictionary or array?
>
> I don’t know what you mean by ‘struct’ here — C structs aren’t Objective-C
> objects, so they can’t appear in a Cocoa collection.
>
> I do know that NSJSONSerialization only supports data types defined in JSON,
> i.e. NSDictionary, NSArray, NSString, NSNumber, NSNull. If your object tree
> has instances of any other classes in it, the encoder will throw an exception.
>
> —Jens
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