Re: confused about allocating and releasing objects
Re: confused about allocating and releasing objects
- Subject: Re: confused about allocating and releasing objects
- From: "Jonathan del Strother" <email@hidden>
- Date: Wed, 27 Aug 2008 11:57:40 +0100
On Wed, Aug 27, 2008 at 11:45 AM, Memo Akten <email@hidden> 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).
Use whichever is easiest. Generally if I'm looking for a temporary
object, I'll use the autoreleased method if present. If I'm going to
keep the object around, I'll use the alloc/init method. But either of
these can be transformed to the other with a retain or autorelease
message, so there's no huge difference.
> 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?
Correct. Review
http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/MemoryMgmt.html
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