SIGABRT： - [NSConcreteFileHandle seekToEndOfFile]：そのようなファイルまたはディレクトリはありません

Question

したがって、加速度計の値をcsvファイルに書き出しています。ときどき動作し、時には動作しないことがあります。通常、加速度計が5秒以上オンになると、クラッシュし、エラーが発生します。ここで

はコードです：

int recordbuttonstatus=0; 
int playbuttonstatus=0; 


int count; 

NSString *dataStr; 
NSString *dirName; 
NSFileManager *filemgr; 
NSString *audiofilename = @"Pneumonia_audio.wav"; 
NSString *audiofilepath; 
NSString *csvfileName = @"accel.csv"; 
NSFileHandle *myHandle; 


- (void)viewDidLoad { 
    [super viewDidLoad]; 
    playbuttonimage.enabled=FALSE; 
    NSArray *pathComponents = [NSArray arrayWithObjects: 
           [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject], 
           audiofilename, 
           nil]; 
    NSURL *outputFileURL = [NSURL fileURLWithPathComponents:pathComponents]; 



    // Setup audio session 
    AVAudioSession *session = [AVAudioSession sharedInstance]; 
    [session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil]; 

    // Define the recorder setting 
    NSDictionary *recordSetting = [NSDictionary 
            dictionaryWithObjectsAndKeys: 
            [NSNumber numberWithInt:AVAudioQualityMin], 
            AVEncoderAudioQualityKey, 
            [NSNumber numberWithInt:16], 
            AVEncoderBitRateKey, 
            [NSNumber numberWithInt: 1], 
            AVNumberOfChannelsKey, 
            [NSNumber numberWithFloat:44100.0], AVSampleRateKey, 
            [NSNumber numberWithInt:16], AVLinearPCMBitDepthKey, 
            nil]; 

    // Initiate and prepare the recorder 
    recorder = [[AVAudioRecorder alloc] initWithURL:outputFileURL settings:recordSetting error:NULL]; 
    recorder.delegate = self; 
    recorder.meteringEnabled = YES; 
    [recorder prepareToRecord]; 

} 

- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 

- (IBAction)recordbuttonaction:(id)sender { 
    if (recordbuttonstatus==0){ 
    [recordbuttonimage setImage:[UIImage imageNamed:@"stoprecord.png"] forState:UIControlStateNormal]; 
     recordbuttonstatus=1; 
     AVAudioSession *session = [AVAudioSession sharedInstance]; 
     [session setActive:YES error:nil]; 

     // Start recording 
     [recorder record]; 

     //Prepare writing to csv 
     dirName = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; 
     filePath = [dirName stringByAppendingPathComponent: csvfileName]; 
     filemgr = [NSFileManager defaultManager]; 
     if ([filemgr fileExistsAtPath:filePath]) { 
      NSLog(@"File %@ being overwritten...", csvfileName); 
      NSError *error = nil; 
      [filemgr removeItemAtPath:filePath error:&error];} 

     else { 
      NSLog(@"File %@ doesn't exist. Making %@.", csvfileName,csvfileName); 
     } 
     [[NSFileManager defaultManager] createFileAtPath:filePath 
               contents:nil 
               attributes:nil]; 
     myHandle = [NSFileHandle fileHandleForWritingAtPath:filePath]; 

     //Start accelerometer 
     count =0; 
     motionManager = [[CMMotionManager alloc] init]; 
     motionManager.deviceMotionUpdateInterval=.02; 

     [motionManager startDeviceMotionUpdatesToQueue:[NSOperationQueue mainQueue] withHandler:^(CMDeviceMotion *deviceMotion, NSError *error) { 
      CMAcceleration userAcceleration = deviceMotion.userAcceleration; 
      float accelval = userAcceleration.y*9.81; 
      count = count + 1; 
      NSString *accelvalue = [[NSString alloc] initWithFormat:@"%f\n",accelval]; 
      NSLog(@"number: %d Accelval: %f",count, accelval); 
      [myHandle seekToEndOfFile]; 
      [myHandle writeData:[accelvalue dataUsingEncoding:NSUTF8StringEncoding]]; 

     }]; 
    } 
     else{ 
      [motionManager stopDeviceMotionUpdates]; 
      [myHandle closeFile]; 
      [recordbuttonimage setImage:[UIImage imageNamed:@"record.png"] forState:UIControlStateNormal]; 
     recordbuttonstatus=0; 
     playbuttonimage.enabled=TRUE; 
     [playbuttonimage setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal]; 
     [recorder stop]; 
     } 

} 

Answer 1

だから私は、私は[ファイルハンドルCLOSEFILE]と呼ばれ、私はそれを得たときに開始し、変更を試し：

私はチャンスそれがなかったことを確認する必要録音後にfileHandleが変更されるか、closeFileがあまりにも早く/遅すぎて呼び出されました。だから、すべてのfileHandle行を、加速度計が各値に対して更新するブロックに置きます。それは私のコードを遅らせるのではないかと恐れていたが、それはしなかった。このコードは、一見完全に見えない

[motionManager startDeviceMotionUpdatesToQueue:[NSOperationQueue mainQueue] withHandler:^(CMDeviceMotion *deviceMotion, NSError *error) { 
     CMAcceleration userAcceleration = deviceMotion.userAcceleration; 
     float accelval = userAcceleration.y*9.81; 
     count = count + 1; 
     NSString *accelvalue = [[NSString alloc] initWithFormat:@"%f\n",accelval]; 
     NSLog(@"number: %d Accelval: %f",count, accelval); 
     NSFileHandle *myHandle; 
     myHandle = [NSFileHandle fileHandleForWritingAtPath:filePath]; 
     [myHandle seekToEndOfFile]; 
     [myHandle writeData:[accelvalue dataUsingEncoding:NSUTF8StringEncoding]]; 
     [myHandle closeFile]; 
    }];