> On Apr 7, 2015, at 3:10 PM, Daryle Walker <[email protected]> wrote:
> 
> I’m using NSURLSessionDownloadTask in a command-line tool. I just adapted it 
> to run multiple URLs to download. The loops and task work when I enter a 
> single URL. When I enter two, the shorter file is downloaded, but the "- 
> URLSession: task: didCompleteWithError:” is called for the second URL, and 
> the error parameter gets NIL as its value. I have a run loop in the main 
> function, and I call “resume” on both tasks. Am I supposed to run the success 
> code when I get a NIL error? But there’s a separate method for successful 
> downloads (and that other method tells me where the new file is)! The two 
> URLs download when I call the tool for them separately.
> 
> I only have two delegate methods defined; the other is “- URLSession: 
> downloadTask: didFinishDownloadingToURL:”.

I changed my mass-resume function to only resume the first download task. The 
next task is resumed within the completion or error handler. The last task 
calls “finishTasksAndInvalidate” for the session. The same error still happens. 
(The actual crash is caused by my code storing the error object, and the 
dictionary craps out when trying to save a NIL object.)

If it makes a difference, the session is configured to use the main thread, 
since tools don’t need extra threads (no GUI).

It seems that something is getting purged on the first competition/error and 
never reinitialized for subsequent tasks.

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


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