Gentlemen, thank you for those succinct responses. I'll go through my code base and make the necessary changes.
Best wishes, Martin On 24, Jun, 2012, at 07:55 AM, Conrad Shultz wrote: > As Roland indicated, yes, this is a general statement. > > It would be advisable to read the Error Handling Programming Guide, which > includes, among other things: > > "Important Success or failure is indicated by the return value of the method. > Although Cocoa methods that indirectly return error objects in the Cocoa > error domain are guaranteed to return such objects if the method indicates > failure by directly returning nil or NO, you should always check that the > return value is nil or NO before attempting to do anything with the NSError > object." > > More at: > > https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ErrorHandlingCocoa/ErrorHandling/ErrorHandling.html > > -Conrad > > On Jun 23, 2012, at 10:35 PM, Martin Hewitson wrote: > >> Just a quick follow up on this. >> >> It's been stated that it's unsafe to check the error returned from >> -writeToURL:atomically:encoding:error: and rather one should check the >> return value. Is this a general statement for other methods which fill an >> error object on error? For example, what about NSFileManager's >> -attributesOfItemAtPath:error: ? The documentation makes no statement about >> the return value in the case of error. Is it standard that the return value >> will be nil? Or should I check the error object in this case? >> >> This thread triggered me to check through the whole project for places where >> I check for non-nil error objects. There are a number, so I'd like to ensure >> I'm doing the right thing in each case. >> >> Any insight gratefully received. >> >> Martin > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Martin Hewitson Albert-Einstein-Institut Max-Planck-Institut fuer Gravitationsphysik und Universitaet Hannover Callinstr. 38, 30167 Hannover, Germany Tel: +49-511-762-17121, Fax: +49-511-762-5861 E-Mail: martin.hewit...@aei.mpg.de WWW: http://www.aei.mpg.de/~hewitson ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
