Sound with pic tutorial by Nitrex88 question

insomniak · 02-10-2009, 11:41 AM

Hello All,

Just so you know...i've never programmed.

I've been tinkering around with Nitrex88's cat sound tutorial and i've learned alot but i can't seem to get it working.

i don't get any error's or warnings but here are my debugger results

2009-02-10 11:30:00.234 meow[10110:20b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSURL initFileURLWithPath:isDirectory:]: nil string parameter'

MainView.h

Code:

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>

@class SoundEffect;

@interface MainView : UIView {
    IBOutlet UIImageView *catImage;
	SoundEffect *soundEffect;
}

@end

MainView.m

Code:

#import "MainView.h"
#import "SoundEffect.h"

@implementation MainView

-(void)awakeFromNib {
	NSBundle *mainBundle = [NSBundle mainBundle];
	soundEffect = [[SoundEffect alloc] initWithContentsOfFile: [mainBundle pathForResource:@"cat" ofType:@"wav"]];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
	[soundEffect play];	
}

	
@end

SoundEffect.h

Code:

#import "MainView.h"
#import "SoundEffect.h"

@implementation MainView

-(void)awakeFromNib {
	NSBundle *mainBundle = [NSBundle mainBundle];
	soundEffect = [[SoundEffect alloc] initWithContentsOfFile: [mainBundle pathForResource:@"cat" ofType:@"wav"]];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
	[soundEffect play];	
}

	
@end

SoundEffect.m

Code:

#import "SoundEffect.h";


@implementation SoundEffect

// Creates a sound effect object from the specified sound file
+ (id)soundEffectWithContentsOfFile:(NSString *)aPath {
    if (aPath) {
        return [[[SoundEffect alloc] initWithContentsOfFile:aPath] autorelease];
    }
    return nil;
}

// Initializes a sound effect object with the contents of the specified sound file
- (id)initWithContentsOfFile:(NSString *)path {
    self = [super init];
    
	// Gets the file located at the specified path.
    if (self != nil) {
        NSURL *aFileURL = [NSURL fileURLWithPath:path isDirectory:NO];
        
		// If the file exists, calls Core Audio to create a system sound ID.
        if (aFileURL != nil)  {
            SystemSoundID aSoundID;
            OSStatus error = AudioServicesCreateSystemSoundID((CFURLRef)aFileURL, &aSoundID);
            
            if (error == kAudioServicesNoError) { // success
                _soundID = aSoundID;
            } else {
                NSLog(@"Error %d loading sound at path: %@", error, path);
                [self release], self = nil;
            }
        } else {
            NSLog(@"NSURL is nil for path: %@", path);
            [self release], self = nil;
        }
    }
    return self;
}

// Releases resouces when no longer needed.
-(void)dealloc {
    AudioServicesDisposeSystemSoundID(_soundID);
    [super dealloc];
}

// Plays the sound associated with a sound effect object.
-(void)play {
	// Calls Core Audio to play the sound for the specified sound ID.
    AudioServicesPlaySystemSound(_soundID);
}

@end

any help would be appreciated.

Thanks in advance!

Jeremy1026 · 02-10-2009, 11:48 AM

Do you have a file called "cat.wav" (case sensitive) in your project bundle?

insomniak · 02-10-2009, 12:40 PM

Quote:

Originally Posted by Jeremy1026

Do you have a file called "cat.wav" (case sensitive) in your project bundle?

Thanks Jeremy! the first time around i the file was cat.wav and this time i forgot i named it catmeow.wav.

it's so much to learn, i feel like i'm learning a foreign language.

What do i do if i want to add multiple sounds with a tableview?

like a list of items and upon clicking the sound plays.

Jeremy1026 · 02-10-2009, 12:48 PM

In your initialization code

Code:

soundEffect2 = [[SoundEffect alloc] initWithContentsOfFile: [mainBundle pathForResource:@"secondsound" ofType:@"wav"]];

in your header

Code:

SoundEffect *soundEffect2;

to play the sound

Code:

[soundEffect2 play];

Obviously, keep adding for how ever many sounds you need. As for the table view, check out myers' tutorial on them on this site. They are very good and will get you started.

lbendlin · 02-10-2009, 01:19 PM

What's the cost of a sound effect? how many can you add before the app crashes? on the other hand, is there a measurable performance impact when you destroy and recreate the same object for reuse?

insomniak · 02-10-2009, 01:56 PM

Quote:

Originally Posted by Jeremy1026

Obviously, keep adding for how ever many sounds you need. As for the table view, check out myers' tutorial on them on this site. They are very good and will get you started.

Will do sir! thanks again