Class method and autorelease objects

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Nick Tamburri - 15 Nov 2007 15:25 GMT

I want to set up some user defaults in an application, but I keep
getting an address check when I go to regirster the defaults. This is
not the first time I have registered user defaults, but it is the
first time I tried to do it using autorelease objects returned from a
class method.

I have a class that looks like this (simplified):

*** MyKeyCode.h
@interface MyKeyCode : NSObject {
unichar key;
unsigned int modifiers;
}

- (id) initWithCommandKey:(unichar) newKey andModifier:(unsigned int) newModifiers;
+ (MyKeyCode *) newKeyWithCommandKey:(unichar) newKey andModifier:(unsigned int) newModifiers;
@end

*** MyKeyCode.m
- (id) initWithCommandKey:(unichar) newKey andModifier:(unsigned int) newModifiers
{
if (self = [super init]) {
key = newKey;
modifiers = newModifiers;
}
return self;
}

+ (MyKeyCode *) newKeyWithCommandKey:(unichar) newKey andModifier:(unsigned int) newModifiers
{
return [[[MyKeyCode alloc] initWithCommandKey:newKey andModifier:newModifiers] autorelease;
//^^^^^^^^^^^^^^^^^ The problem?
}

*** AppController.m

NSString *NCTSpaceKey = @"MySpaceKey";

+ (initialize)
NSMutableDictionaty *defaults = [NSMutableDictionary dictionary];

...

[defaults setObject:[MyKeyCode newKeyWithCommandKey:' ' andModifier:0]
forKey:NCTSpaceKey];

[[NSUserDefaults standardUserDefaults] registerDefaults:defaults]; // << ADDRESS CHECK

...

===============
I think I am generating or returning the object to be stored
incorrectly, but I have not been able to figure out my error, and
neither Google not the Xcode docs have been useful in this instance.

Any pointers would be appreciated. Thank you.

/nt

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David Phillip Oster - 15 Nov 2007 15:35 GMT

> I want to set up some user defaults in an application, but I keep
> getting an address check when I go to regirster the defaults. This is
[quoted text clipped - 32 lines]
> return [[[MyKeyCode alloc] initWithCommandKey:newKey
> andModifier:newModifiers] autorelease;

missing close ']'

> //^^^^^^^^^^^^^^^^^ The problem?
> }
[quoted text clipped - 13 lines]
> [[NSUserDefaults standardUserDefaults] registerDefaults:defaults]; // <<
> ADDRESS CHECK

You are putting an object into UserDefaults that UserDefaults can't handle.
See

file:///Developer/ADC%20Reference%20Library/documentation/Cocoa/Conceptual/UserDefaults

which says:

Note that a default's value can be only property list objects:
NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary.

That document goes on to describe how you deal with storing other
information in UserDefaults, using NSColor as an example.

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Nick Tamburri - 15 Nov 2007 19:37 GMT

> You are putting an object into UserDefaults that UserDefaults can't handle.
> See
[quoted text clipped - 8 lines]
> That document goes on to describe how you deal with storing other
> information in UserDefaults, using NSColor as an example.

I see.

I read about NSColor's limitation in Hillegass' book, but I was lead
to believe that the "problem" was with NSColor itself, not a
limitation of NSUserDefaults.

Thanks.

/nt

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Mac Forum / Programming / Mac Programming / November 2007

Class method and autorelease objects