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POiOS - I'm confused how memory is being handled here?
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  1. POiOS - I'm confused how memory is being handled here?
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    copied!<p>UIImage API Reference Document:-<br> initWithContentsOfFile:<br> Initializes and returns the image object with the contents of the specified file.</p> <pre><code>- (id)initWithContentsOfFile:(NSString *)path </code></pre> <p><strong>Parameters</strong><br> <strong><em>path</em></strong><br> The path to the file. This path should include the filename extension that identifies the type of the image data.<br> <strong>Return Value</strong> An initialized <strong>UIImage object</strong>, or <strong>nil</strong> if the method could not find the file or initialize the image from its contents.</p> <p><br> <I> Considering this scenario, suppose I have a class, it could be extension of any class. Just took UIImage for example.</I></p> <pre><code>@interface myImage : UIImage { BOOL isDefaultSet; } -(id)initWithDefaultImage; @end @implementation myImage -(id)initWithDefaultImage { NSString *path = [[NSBundle mainBundle] pathForResource:@"someInvalidImage" ofType:@"png"]; idDefaultSet = YES; return [self initWithContentsOfFile:path]; } @end //somewhere in other class: NSString *path = [[NSBundle mainBundle] pathForResource:@"someInvalidImage" ofType:@"png"]; myImage *myObject = [[myImage alloc] initWithDefaultImage]; UIImage *yourObject = [[UIImage alloc] initWithContentsOfFile:path]; </code></pre> <p>now here in both cases, </p> <p>"alloc" gives "retainCount+1" <br></p> <p>and if </p> <blockquote> <p>initWithDefaultImage/initWithContentsOfFile</p> </blockquote> <p>returned nil due to some issue - lets say (invalid file path), this memory will be leaked as </p> <blockquote> <p>myObject/yourObject</p> </blockquote> <p>will be set to nil even though the <strong>allocation</strong> was made before <strong>init</strong>.</p> <p>I have seen many implementations for extended classes/interfaces in this manner. I'm confused how memory is being handled here? can anyone share view on this?</p>
 

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