使用NSURLSession下载时获取文件路径 [英] get file path when downloading with NSURLSession

问题描述

我想在下载时播放音乐，所以我要播放带有本地文件的音乐，如何在通过NSURLSession下载时在tmp目录中获取文件路径。

I want to play music while downloading, so i play music with local file, how can i get file path in tmp directory while downloading with NSURLSession.

方法 URLSession：downloadTask：didFinishDownloadingToURL：只能在文件下载时调用，所以我该怎么办

The method URLSession:downloadTask:didFinishDownloadingToURL: than only call while file downloaded, so what should i do

推荐答案

如果要在下载文件时获取文件位置，请不要使用下载任务。例如，创建一个 NSURLSessionDataTask 并将其自己流式传输到持久性存储（例如，为持久性本地文件创建自己的 NSOutputStream 存储并打开它，然后在 didReceiveData 中，将数据写入流中，并在完成后关闭流）。然后，您可以对流/文件执行其他任何操作。如果使用AFNetworking，我相信 AFHTTPRequestOperation 也会为此公开一个 outputStream 属性。

If you want to get file location as it's being downloaded, just don't use download task. For example, create a NSURLSessionDataTask and stream it to persistent storage yourself (e.g. create your own NSOutputStream for local file in persistent storage and open it, and then in didReceiveData, just write the data to your stream, and close the stream when you're all done). Then you can do whatever else you want with the stream/file. If using AFNetworking, I believe that the AFHTTPRequestOperation exposes an outputStream property for this purpose, too.

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