可可：AVAudioRecorder未能記錄

Question

AVAudioSession *audioSession = [AVAudioSession sharedInstance]; 
NSError *err = nil; 
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&err]; 
if(err){ 
    NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]); 
    return; 
} 
[audioSession setActive:YES error:&err]; 
err = nil; 
if(err){ 
    NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]); 
    return; 
} 

NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init]; 

[recordSetting setValue:[NSNumber numberWithInt: kAudioFormatAppleIMA4] forKey:AVFormatIDKey]; 
[recordSetting setValue:[NSNumber numberWithFloat:40000.0] forKey:AVSampleRateKey]; 
[recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey]; 
[recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey]; 
[recordSetting setValue:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey]; 
[recordSetting setValue:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey]; 

// Create a new dated file 
NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0]; 
NSString *caldate = [now description]; 
NSString *recorderFilePath = [[NSString stringWithFormat:@"%@/%@.caf", DOCUMENTS_FOLDER, caldate] retain]; 

NSLog(recorderFilePath); 
url = [NSURL fileURLWithPath:recorderFilePath]; 
err = nil; 
recorder = [[ AVAudioRecorder alloc] initWithURL:url settings:recordSetting error:&err]; 
if(!recorder){ 
    NSLog(@"recorder: %@ %d %@", [err domain], [err code], [[err userInfo] description]); 
    UIAlertView *alert = 
    [[UIAlertView alloc] initWithTitle: @"Warning" 
           message: [err localizedDescription] 
           delegate: nil 
        cancelButtonTitle:@"OK" 
        otherButtonTitles:nil]; 
    [alert show]; 
    [alert release]; 
    return; 
} 

//prepare to record 
[recorder setDelegate:self]; 
[recorder prepareToRecord]; 
recorder.meteringEnabled = YES; 

BOOL audioHWAvailable = audioSession.inputIsAvailable; 
if (! audioHWAvailable) { 
    UIAlertView *cantRecordAlert = 
    [[UIAlertView alloc] initWithTitle: @"Warning" 
           message: @"Audio input hardware not available" 
           delegate: nil 
        cancelButtonTitle:@"OK" 
        otherButtonTitles:nil]; 
    [cantRecordAlert show]; 
    [cantRecordAlert release]; 
    return; 
} 
// [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateTimerDisplay) userInfo:nil repeats:YES]; 
// [recorder recordForDuration:(NSTimeInterval)10 ]; 
// [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateTimerDisplay) userInfo:nil repeats:YES]; 

Answer 1

你從來沒有致電：

[recorder record]; 

...所以永遠錄音機開始錄音。

這是我從來沒有做過的那種錯誤。至少，這是我永遠不會承認的錯誤。 ;-)