在儀器的NSData dataWithContentsOfFile 100％泄漏

Question

修訂

爲什麼NSData dataWithContentsOfFile線表示儀器泄漏？ 我正在使用ARC。部署目標是iOS的5.0

@autoreleasepool 
{ 
    AudioPlayerAV *context = [userInfo valueForKey:@"self"]; 
    NSString *filepath = [userInfo valueForKey:@"filepath"]; 
    [context.player stop]; 

    //check if file is there fetch player from dict 
    AVAudioPlayer *_player = nil; 
    NSError *error = nil; 
    NSData *filedata = [NSData dataWithContentsOfFile:filepath]; 

    _player = [[AVAudioPlayer alloc]initWithData:filedata error:&error]; 
    context.player = _player; 
    NSLog(@"loadAndPlay error : %@",[error description]); 
    context.player.numberOfLoops = (context.loop)?-1:0; 
    context.player.volume = context.volume; 
    [context.player play]; 
} 

Answer 1

有時候，儀器指向錯誤的路線，我認爲這是AVAudioPlayerthis泄漏。

來自：Leak from NSURL and AVAudioPlayer using ARC

Looks to be a leak in Apple's code... I tried using both

-[AVAudioPlayer initWithData:error:] and -[AVAudioPlayer initWithContentsOfURL:error:]

In the first case, the allocated AVAudioPlayer instance retains the passed in NSData. In the second, the passed in NSURL is retained.

You can see the AVAudioPlayer object then creates a C++ object AVAudioPlayerCpp, which retains the NSData again

Later, when the AVAudioPlayer object is released, the NSData is released, but there's never a release call from the associated AVAudioPlayerCpp... (You can tell from the attached image)

檢查出來，也有附加在answer一些儀器截圖。