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PONSScanner memory leak
 

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    <p>I'm at my first experiences with iPhone development. I wrote some basic code to test the NSScanner class, and now I was looking into the Leaks tool. It seems that this code is leaking, when in the detailed stack I double-click my last call (before Apple's stuff), the incriminated line is the commented.</p> <p>Can anyone help me to understand why this is leaking? from a logical point of view the result is what I expect, and I do not formally alloc anything myself (except for the xmlblock variable, which is btw autoreleased), so I would not expect the need to release anything... where I'm wrong? :-)</p> <pre><code>+(NSSet *)extractXMLSectionsWithTag:(NSString *)tag fromString:(NSString *)source firstOnly:(BOOL)firstOnly { if (!source) return nil; NSScanner *scanner = [NSScanner scannerWithString:source]; NSString *openingToken = [NSString stringWithFormat:@"&lt;%@", tag]; NSString *closingToken = [NSString stringWithFormat:@"&lt;/%@&gt;", tag]; NSMutableSet *sections = [NSMutableSet set]; NSCharacterSet *majorChar = [NSCharacterSet characterSetWithCharactersInString:@"&gt;"]; while (![scanner isAtEnd]) { NSString *xmlBlock = [[[NSString alloc] init] autorelease]; [scanner scanUpToString:openingToken intoString:NULL]; [scanner scanString:openingToken intoString:NULL]; [scanner scanUpToCharactersFromSet:majorChar intoString:NULL]; [scanner scanCharactersFromSet:majorChar intoString:NULL]; [scanner scanUpToString:closingToken intoString:&amp;xmlBlock]; if (![xmlBlock isEqualToString:@""]) { // Leaking line [sections addObject:xmlBlock]; if (firstOnly) { break; } } } return [sections copy]; } </code></pre>
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    1. COBy the way, you don't need to create a blank string for `scanUpToString:intoString:`, you can just set it to `nil`, and the method will change it if it scans text. Another potentially useful thing is that all those `NSScanner` methods return a boolean value based on whether they succeeded or not.
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