本文介绍了iPod Library到NSData的路径的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
如何将iPod库转换为NSData.网址是:
How to convert the iPod library to NSData.The url is:
ipod-library://item/item.mp3?id=1258203422631791096
遇到错误，但是我可以使用AVPlayer播放歌曲.
Getting error but, I can play the song by using AVPlayer.
NSURL *url = [curItem valueForProperty: MPMediaItemPropertyAssetURL];
NSError *error = nil;
NSData *data = [NSData dataWithContentsOfFile:[url absoluteString] options:NSDataReadingMappedAlways error:&error];
NSLog(@"Error : %@",error);
curItem是MPMediaItem
The curItem is a MPMediaItem
Error Domain=NSCocoaErrorDomain Code=260 "The file "item.mp3?id=1258203422631791096" couldn’t be opened because there is no such file." UserInfo={NSFilePath=ipod-library://item/item.mp3?id=1258203422631791096, NSUnderlyingError=0x15ff23420 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}
推荐答案
您不能直接访问媒体项URL，因为它位于应用程序的沙箱外部.
You cannot access the media item URL directly, as it resides outside your application's sandbox.
您需要使用AVAssetExportSession来获取资产，并将其保存到沙箱中的URL.您可以从那里获取NSData –请参阅此问题 iOS 6问题将MPMediaItem转换为NSData
You need to fetch the asset using AVAssetExportSession that saves it to an URL in your sandbox. You can get NSData from there – see this SO question iOS 6 issue Convert MPMediaItem to NSData
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