CODEWITHSUNDEEP
iphonenscoder
Amarsh
Amarsh

Reputation: 11804

iphone / objective C / how to encode a double[] for archiving

I am using double[] instead of NSArray. Would anyone know how to encode it for archiving

Upvotes: 2

Views: 208

Answers (2)

davehayden
davehayden

Reputation: 3484

If you're not transferring the encoded data between platforms, where you might run into problems with endianness and data size, you can use

- (void)encodeBytes:(const uint8_t*)bytesp length:(NSUInteger)lenv forKey:(NSString*)key;

to store the bytes directly, and then

- (const uint8_t*)decodeBytesForKey:(NSString*)key returnedLength:(NSUInteger*)lengthp;

to decode them. As the NSCoder header file points out, the decodeBytesForKey:returnedLength: method returns immutable bytes, so you'll want to copy the returned array into your malloced double array. Since the returned array is const, I'm assuming the decoder owns that array and will free it when the decoder is dealloced.

This isn't as convenient as just putting the array into an NSData object and archiving that, but it does avoid the overhead of creating a temporary object.

Upvotes: 0

Dave DeLong
Dave DeLong

Reputation: 243156

Two options come to mind:

  1. Convert it into an NSArray of NSNumber objects.
  2. Shoehorn it into an NSValue or NSData object.

Upvotes: 1

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