Saving data in a document

FROM : Chad Armstrong
DATE : Wed Jun 21 19:13:38 2006

I'm working my way into learning how to work with a Document-based architecture.  Below I have an example of how to save the data from a text view.  This works great in just saving that data, but how do I go about saving other data?  What if I want to be able to save other information, such as version information, or the date that this document was last read/modified, etc?  Also, how would I then extract the data from the saved file?  Would this involve a dictionary format, similar to saving user preferences?

- (NSData *)dataRepresentationOfType:(NSString *)aType
{
    // Insert code here to write your document from the given data.  You can also choose to override -fileWrapperRepresentationOfType: or -writeToFile:ofType: instead.
    // return nil;
   
   NSRange range = NSMakeRange(0, [[commentsTextView textStorage] length]);
   return [commentsTextView RTFDFromRange:range];
}

Regards,

Chad