name = [NSString stringWithString:aString];
is creating an autoreleased string. If you want to keep it around, you
will need to:
[name retain];
and similarly with your height setter. I believe this will solve your
problem.
Can you use or are you using Obj-C 2.0? If so, I would suggest looking
into using @property & @synthesize.
You could define your height & name by doing:
@property (retain) NSNumber *height;
@property (retain) NSString *name;
and in your implementation so:
@synthesize height;
@synthesize name;
With this, you can get rid of your getter & setter code.
On Sep 29, 2008, at 4:57 PM, Adil Saleem wrote:
Hi,
I am trying to write instances of a class (subclass of NSObject) in
an array and then write them to a preferences files using
NSKeyedArchiver. It does so successfully. After i unarchive it using
NSKeyedUnarchiver, it reads the contents in the array. It also
reports correct no. of objects of that class in the array. But when
i try to use those objects, program crashes. To check the program, i
did this with simple NSArray instances instead of my class objects.
It worked fine. So i have my doubts on my class. Any ideas why i
have done wrong in my class. Here is the code of my class.
data.h
@interface data : NSObject <NSCoding>{
NSNumber *height;
NSString *name;
}
-(NSNumber *)height;
-(void)setHeight:(NSNumber *)aNumber;
-(NSString *)name;
-(void)setName:(NSString *)aString;
-(void)initWithParams:(float)aFloat name:(NSString *)aString;
-(void)dealloc;
-(id)initWithCoder:(NSCoder*)coder;
-(void)encodeWithCoder:(NSCoder*)coder;
data.m
@implementation data
-(void)initWithParams:(float)aFloat name:(NSString *)aString
{
[super init];
height = [NSNumber numberWithFloat:aFloat];
name = [NSString stringWithString:aString];
}
-(void)setHeight:(NSNumber *)aNumber
{
if(height != aNumber)
{
[height autorelease];
height = [NSNumber numberWithFloat:[aNumber floatValue]];
}
}
-(NSNumber *)height
{
return height;
}
-(void)setName:(NSString *)aString
{
if(name != aString)
{
[name autorelease];
name = [NSString stringWithString:aString];
}
}
-(NSString *)name
{
return name;
}
-(id)initWithCoder:(NSCoder*)coder
{
if(self = [super init])
{
[self setHeight:[coder decodeObjectForKey:@"Height"]];
[self setName:[coder decodeObjectForKey:@"Preset Name"]];
}
return self;
}
-(void)encodeWithCoder:(NSCoder*)coder
{
[coder encodeObject:height forKey:@"Height"];
[coder encodeObject:name forKey:@"Preset Name"];
}
-(void)dealloc
{
[super dealloc];
}
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