Problem with memory leaks
- by user191723
Sorry, having difficulty formattin code to appear correct here???
I am trying to understand the readings I get from running instruments
on my app which are telling me I am leaking memory.
There are a number, quite a few in fact, that get reported from inside
the Foundation, AVFoundation CoreGraphics etc that I assume I have no
control over and so should ignore such as:
Malloc 32 bytes: 96 bytes, AVFoundation, prepareToRecordQueue
or
Malloc 128 bytes: 128 bytes, CoreGraphics, open_handle_to_dylib_path
Am I correct in assuming these are something the system will resolve?
But then there are leaks that are reported that I believe I am
responsible for, such as:
This call reports against this line leaks 2.31KB
[self createAVAudioRecorder:frameAudioFile];
Immediately followed by this:
-(NSError*) createAVAudioRecorder: (NSString *)fileName {
// flush recorder to start afresh
[audioRecorder release];
audioRecorder = nil;
// delete existing file to ensure we have clean start
[self deleteFile: fileName];
VariableStore *singleton = [VariableStore sharedInstance];
// get full path to target file to create
NSString *destinationString = [singleton.docsPath stringByAppendingPathComponent: fileName];
NSURL *destinationURL = [NSURL fileURLWithPath: destinationString];
// configure the recording settings
NSMutableDictionary *recordSettings = [[NSMutableDictionary alloc] initWithCapacity:6]; //****** LEAKING 384 BYTES
[recordSettings setObject:[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey: AVFormatIDKey]; //***** LEAKING 32 BYTES
float sampleRate = 44100.0;
[recordSettings setObject:[NSNumber numberWithFloat: sampleRate] forKey: AVSampleRateKey]; //***** LEAKING 48 BYTES
[recordSettings setObject:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];
int bitDepth = 16;
[recordSettings setObject: [NSNumber numberWithInt:bitDepth] forKey:AVLinearPCMBitDepthKey]; //***** LEAKING 48 BYTES
[recordSettings setObject:[NSNumber numberWithBool:YES] forKey:AVLinearPCMIsBigEndianKey];
[recordSettings setObject:[NSNumber numberWithBool: NO]forKey:AVLinearPCMIsFloatKey];
NSError *recorderSetupError = nil;
// create the new recorder with target file
audioRecorder = [[AVAudioRecorder alloc] initWithURL: destinationURL settings: recordSettings error: &recorderSetupError]; //***** LEAKING 1.31KB
[recordSettings release];
recordSettings = nil;
// check for erros
if (recorderSetupError) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Can't record" message: [recorderSetupError localizedDescription] delegate: nil cancelButtonTitle: @"OK" otherButtonTitles: nil];
[alert show];
[alert release];
alert = nil;
return recorderSetupError;
}
[audioRecorder prepareToRecord]; //***** LEAKING 512 BYTES
audioRecorder.delegate = self;
return recorderSetupError;
}
I do not understand why there is a leak as I release audioRecorder at
the start and set to nil and I release recordSettings and set to nil?
Can anyone enlighten me please?
Thanks
