On 24/07/2009, at 5:46 AM, Korei Klein wrote:

I'm trying to use the document architecture in an application that will create documents for some very big files. I'd like not to have an entire file in memory at once. To use the document architecture, I'm subclassing NSDocument and overriding the readFromFileWrapper method. As far as I can tell, there is no way to use a FileWrapper object to read a file one buffer at a time.

Can I find out a filename, or a filehandle from a FileWrapper? Alternatively, is there any way to have an NSDocument using the document architecture which reads its files one buffer at a time?

Have you looked at the API for NSFileWrapper? You can get the filename, and (I guess) as long as you don't call - regularFileContents, you can use whatever NSData methods make sense to get at parts of the file on demand. There's no requirement that NSDocument actually loads the whole file - you can return YES to tell it everything went OK, and retain and manage the data internally however you see fit.

--Graham


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