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POString manipulation without memory leaks?
 

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    <p>I'd like to do a series of string substitutions to removed xml-escaped chars such as <code>'&amp;amp;'</code>. </p> <p>1) Is there an existing UIKit function that can do this?</p> <p>2) If not, what's the best way to do it without leaking memory? Here's the idea:</p> <pre><code>-(NSString*) unescape:(NSString*)string { string = [string stringByReplacingOccurrencesOfString:@"&amp;apos;" withString:@"'"]; string = [string stringByReplacingOccurrencesOfString:@"&amp;amp;" withString:@"&amp;"]; string = [string stringByReplacingOccurrencesOfString:@"&amp;quot;" withString:@"\""]; string = [string stringByReplacingOccurrencesOfString:@"&amp;gt;" withString:@"&gt;"]; string = [string stringByReplacingOccurrencesOfString:@"&amp;lt;" withString:@"&lt;"]; return string; } </code></pre> <p>But doesn't that leak memory with each assignment? Or does stringByReplacingOccurrencesOfString return autoreleased strings? How do we confirm that stringByReplacingOccurrencesOfString strings are autoreleased? Or should we wrap them with <code>[... autorelease]</code>?</p> <p>Even if they are autoreleased, it's preferable to avoid autorelease on the iPhone. (See <a href="http://kosmaczewski.net/2009/01/28/10-iphone-memory-management-tips/" rel="nofollow noreferrer">here</a>). So then we would do:</p> <pre><code>-(NSString*) unescape:(NSString*)string { NSString* string2 = [string stringByReplacingOccurrencesOfString:@"&amp;apos;" withString:@"'"]; // don't release 'string' because we didn't allocate or retain it NSString* string3 = [string2 stringByReplacingOccurrencesOfString:@"&amp;apos;" withString:@"'"]; [string2 release]; NSString* string4 = [string3 stringByReplacingOccurrencesOfString:@"&amp;apos;" withString:@"'"]; [string3 release]; //...and so on } </code></pre> <p>But that's pretty ugly code. What's the best way to write this code to do multiple substitutions? How would you do it?</p>
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    1. USChris Hanson
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      1. USChristian Studer
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