Re: confused about allocating and releasing objects
Re: confused about allocating and releasing objects
- Subject: Re: confused about allocating and releasing objects
- From: Devon Ferns <email@hidden>
- Date: Wed, 27 Aug 2008 09:40:47 -0400
If you had access to the NSDictionary source code you'd find that the
NSDictionary's +dictionaryWithContentsOfFile:(NSString*)fileName would
probably look something like this:
+(NSDictionary*) dictionaryWithContentsOfFile:(NSString*)fileName
{
return [[[NSDictionary alloc] initWithContentsOfFile] autorelease];
}
As you can see it's not really doing anything all that special. It's
really just saving you some typing and having to release it yourself if
it's for a temporary variable.
Devon
Memo Akten wrote:
HI All, i'm a bit confused about the 2 scenarios:
NSDictionary *myData1 = [NSDictionary
dictionaryWithContentsOfFile:@"mydata.plist"]; // this one I
don't need to release when I'm done?
NSDictionary *myData2 = [[NSDictionary alloc]
initWithContentsOfFile:@"mydata.plist"]; // this one I do need to
relase when I'm done?
There seems to be a lot of situations in Cocoa where this happens so I
guess this is a generic question for all cases when an object is created
via means of a static method vs using alloc:initWith... (e.g. NSArray,
NSString, NSNumber etc. are just a few I've seen).
Whats the difference between the two methods? (I know the second one
creates a blank dictionary first, and then loads the file - but I mean
which one is better for what purpose? - why would I choose one over the
other). And am I correct in assuming if I use the first method i do not
need to release the variable when I'm done? but do need to release the
variable in the second instance?
Cheers,
Memo.
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