Hello List,I'm thinking of switching from a single-file based document file storage to a package document with various files in it, I have a little problem with that though:
My app stores a lot of data in a document, potentially hundreds of megabytes. The problem with using single files and NSKeyedArchiver is that one has to write everything, even if only a tiny part of the structure changed. My data is clustered into handy little pieces which could be saved into their own separate files within the package.
The problem is that - if I understand it correctly - when using file wrapper -fileWrapperOfType: of NSDocument, I always have to provide the complete wrapper, including all contained wrappers. That of course is exactly what I hoped to avoid because it means I'd have to write all data (this time into separate files/wrappers).
The NSBundle guide mentions another technique of using "traditional file system methods" for loading and saving when you have special needs. It's rather vague beyond that and I was hoping to get some hints as to how to tackle this problem.
I wouldn't mind loading all the data at once. What I'm after is a mechanism that would allow me to update only parts of the package (adding, changing or deleting files as needed). Is there any chance I can use -fileWrapperOfType: for that?
Looking at the NSDocument file saving message flow, it seems rather difficult to come up with something completely different. The document location you're saving to is not the final location of the real document on the disk. That of course prevents you from only writing parts of the document because the other stuff would be lost when your new version is moved to its final destination.
So the question is, can I use NSDocument with an "update-relevant- parts-of-a-package-only" saving mechanism? Thanks for any pointers!
Regards Markus -- __________________________________________ Markus Spoettl
smime.p7s
Description: S/MIME cryptographic signature
_______________________________________________ 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
