Re: Using the Document Architecture and Reading files one buffer at a time
Re: Using the Document Architecture and Reading files one buffer at a time
- Subject: Re: Using the Document Architecture and Reading files one buffer at a time
- From: Graham Cox <email@hidden>
- Date: Fri, 24 Jul 2009 13:24:48 +1000
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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