On Jul 21, 2011, at 1:01 PM, Wilker wrote: > I updated to Lion yesterday, but I'm having an issue now with [NSData > dataWithContentsOfFile]
> Before Lion, it really works well and fast, even on Wifi external drive > (through Airport Extreme), but now it get's really slow... I did some > checks, and now its reading the entire file... instead of just read 128kb > (start and end). Anyone have an ideia on why its happening now? And how to > make it works as before on Snow Leopard? >From the Foundation release notes ><http://developer.apple.com/library/mac/#releasenotes/Cocoa/Foundation.html>: > Safe File Mapping for NSData > Before Mac OS 10.7, specifying NSDataReadingMapped (or NSMappedRead) for > -initWithContentsOfFile:options:error: would cause NSData to always attempt > to map in the specified file. However, in some situations, mapping a file can > be dangerous. For example, when NSData maps a file from a USB device or over > the network the existence of said file can't be guaranteed for the lifetime > of the object. Accessing the NSData's bytes after the mapped file disappears > will likely cause unpredictable crashes in your application. > > For applications linked on Mac OS 10.7 or later, NSDataReadingMapped will now > only map the requested file if it can determine that mapping the file will be > relatively safe. To reflect this change, NSDataReadingMapped has been > deprecated and is now an alias for NSDataReadingMappedIfSafe. > > The methods -dataWithContentsOfMappedFile: and -initWithContentsOfMappedFile: > have been deprecated. In the very rare event that your application needs to > map a file regardless of safety, you may use the NSDataReadingMappedAlways > option. Regards, Ken _______________________________________________ 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
