This is inspired by me incorrectly checking the result of NSFileManager's "- 
moveItemAtURL: toURL: error:” method. This call is within a block function in a 
call of NSURLSession’s "- downloadTaskWithURL: completionHandler:”. Said 
completion handler has a prototype of "void (^)(NSURL *location, NSURLResponse 
*response, NSError*error)”. Am I supposed to check for success by seeing 
whether or not “error” is nil, or if whether or not “location” (and/or 
“response”) is NOT nil?

Unlike some older APIs, NSURLSession’s method arguments that are block pointers 
do not have those inner functions’ parameters and/or return values fully 
explained. The URL Loading System Programming Guide does not explain what’s 
expected of those blocks either. File a bug?

— 
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT mac DOT com 


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