On 5/8/12 2:35 PM, Alex Zavatone wrote: > 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:
No one disputes that CLLocationCoordinate2D is a struct. What Jens is saying is that you can't store an unwrapped struct in a Cocoa collection - be it a dictionary, array, or set. What's getting lost in translation here is that -annotations is an array of objects of type id <MKAnnotation>. What sort of object conforming to MKAnnotation are you adding to your annotations array? Whatever it is, it must have a -coordinate property. It is *this* property this is a CLLocationCoordinate2D struct. This is how the data is getting stored in a Cocoa collection. In any event, I don't see how you could directly serialize your annotation object to a JSON object for exactly the reason Jens described (i.e. type incompatibility). If you need to convert to JSON you could, for example, write an NSValueTransformer that converts your id <MKAnnotation> to an NSDictionary that is compliant with NSJSONSerialization requirements. Assuming that you are planning on using JSON to communicate with a web service, though, you will need to determine what data structure the service is expecting and emit that. -- Conrad Shultz Synthetiq Solutions www.synthetiqsolutions.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
