Hi Daryle,
Receiving a nil error on success is expected— please refer to NSURLSession.h:
/* Sent as the last message related to a specific task. Error may be
* nil, which implies that no error occurred and this task is complete.
*/
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
didCompleteWithError:(NSError *)error;
In the case of a successful download, your delegate should receive:
-URLSession:downloadTask:didFinishDownloadingToURL:
with the location of the downloaded file, followed by:
-URLSession:task:didCompleteWithError:
with a nil error parameter.
- Dan
> On Apr 7, 2015, at 11:44 PM, Daryle Walker <[email protected]> wrote:
>
>> 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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