关于ios：iPod库路径到NSData

iPod Library path to NSData

如何将 iPod 库转换为 NSData。
网址是：

1	ipod-library://item/item.mp3?id=1258203422631791096

出现错误，但我可以使用 AVPlayer 播放歌曲。

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NSURL *url = [curItem valueForProperty: MPMediaItemPropertyAssetURL];
NSError *error = nil;
NSData *data = [NSData dataWithContentsOfFile:[url absoluteString] options:NSDataReadingMappedAlways error:&error];
NSLog(@"Error : %@",error);

curItem 是一个 MPMediaItem

Error Domain=NSCocoaErrorDomain Code=260"The file a€?item.mp3?id=1258203422631791096a€? couldna€?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"}}