On Sat, 19 Feb 2011 17:17:36 -0500, Michael Crawford <[email protected]> said: >I'm trying to compare instances of NSNumber using NSSet. I have a set of >numbers, which represent 64-bit persistent IDs for iTunes media-items. I >access these values using the -[NSNumber longLongValue] method.
You're having a fundamental numerics mismatch. The problem is that the 64-bit persistent IDs for iTunes media items are not long long, so reading them with longLongValue will give you the wrong answer. They are *unsigned* long long, which is a different animal. This matter has been discussed fairly extensively on StackOverflow. My own preference for reading these items is to leave them as NSNumber wherever possible; if I need an alternative representation, I pass them through @"%@" as a string format, which results in a string that does the right thing. See also: http://stackoverflow.com/questions/1181637/storing-and-retrieving-unsigned-long-long-value-to-from-nsstring m. -- matt neuburg, phd = [email protected], <http://www.apeth.net/matt/> A fool + a tool + an autorelease pool = cool! AppleScript: the Definitive Guide - Second Edition! http://www.apeth.net/matt/default.html#applescriptthings_______________________________________________ Cocoa-dev mailing list ([email protected]) 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 [email protected]
