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I don't understand why I can archive CGPoint structs but not CLLocationCoordinate2D structs. What's the difference to the archiver? Platform is iOS. I'm running in the simulator and haven't tried on the device. // why does this work: NSMutableArray *points = [[[NSMutableArray alloc] init] autorelease]; CGPoint p = CGPointMake(10, 11); [points addObject:[NSValue valueWithBytes: &p objCType: @encode(CGPoint)]]; [NSKeyedArchiver archiveRootObject:points toFile: @"/Volumes/Macintosh HD 2/points.bin" ]; // and this doesnt work: NSMutableArray *coords = [[[NSMutableArray alloc] init] autorelease]; CLLocationCoordinate2D c = CLLocationCoordinate2DMake(121, 41); [coords addObject:[NSValue valueWithBytes: &c objCType: @encode(CLLocationCoordinate2D)]]; [NSKeyedArchiver archiveRootObject:coords toFile: @"/Volumes/Macintosh HD 2/coords.bin" ]; I get a crash on the 2nd archiveRootObject and this message is printed to the console: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSKeyedArchiver encodeValueOfObjCType:at:]: this archiver cannot encode structs'

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