用createDownloadFileTask 接口下载url文件
下面是log
Button clicked
path:/Users/ms/Library/Developer/CoreSimulator/Devices/44C069A3-2794-4896-AAEB-0CFDBF7C6055/data/Containers/Data/Application/5D80129B-9C92-4294-906D-F504BC4A7C87/Documents/22CppTests/DownloaderTest/d447b8653f22844b.mp3
0.1%
0.3%
0.5%
42.1%
42.7%
45.8%
46.0%
99.4%
100.0%
Failed to download : http://ac-VJn6W5s3.clouddn.com/d447b8653f22844b.mp3, identifier(d447b8653f22844b.mp3) error code(-2), internal error code(4) desc(The file “CFNetworkDownload_RBP7dK.tmp” doesn’t exist.)
请问是什么原因?
http://ac-VJn6W5s3.clouddn.com/d447b8653f22844b.mp3 是url的文件