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POARC autoreleases too early (?)
 

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    <p>I have a method call in class A:</p> <pre><code>GDataXMLElement *infoElement = [self getElementFromFilePath:filePath]; NSString *testStringA = [infoElement attributeForName:@"someAttribute"].stringValue; </code></pre> <p>and the method implementation in class B:</p> <pre><code>-(GDataXMLElement*)getElementFromFilePath:(NSString*)filePath { NSData *xmlData = [NSData dataWithContentsOfFile:filePath]; GDataXMLDocument *infoXMLDoc = [[GDataXMLDocument alloc] initWithData:xmlData options:0 error:nil]; NSArray *infoArray = [infoXMLDoc.rootElement elementsForName:@"test"]; GDataXMLElement *returnElement = (GDataXMLElement*)infoArray[0]; NSString *testStringB = [returnElement attributeForName:@"someAttribute"].stringValue; return returnElement; } </code></pre> <p>The <code>returnElement</code> at the end of the method in class B is perfectly initialized, and <code>testStringB</code> string contains the correct value. But in Class A, the contents of <code>InfoElement</code> are gone, and testStringA is nil. </p> <p>I suspect that ARC is releasing GDataXMLDocument too early, and was able to stop this behaviour by tying the document to a property in class B:</p> <pre><code>@property (nonatomic,strong) GDataXMLDocument *infoXMLDoc; </code></pre> <p>But I am a little unsatisfied with this solution. I'll never use that property again, I just need the element to parse it one time only. If it is possible to stop the release with a property, is there also a way to do this within the method? I tried the __strong qualifier like this:</p> <pre><code>GDataXMLDocument __strong *infoXMLDoc = [[GDataXMLDocument alloc] initWithData:xmlData options:0 error:&amp;error]; </code></pre> <p>but that didn't help. So my questions, assuming ARC is indeed responsible:</p> <p><strong>1. Is is possible to tell ARC within a method to not release an object?</strong></p> <p><strong>2. What did I not understand about the behaviour here?</strong> I am using ARC for some time now, this is the first time that I am stuck. </p>
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    1. COWhen you say that "the contents of `InfoElement` are gone", do you mean that it has a `GDataXMLElement` assigned to it, but that object doesn't contain what you expect? Or do you mean that it is `nil`?
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    2. COThat code won't compile; there is no `infoElement` in `getElementFromFilePath()`.
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    3. COHave you followed [the instructions for adding GData to a project](http://code.google.com/p/gdata-objectivec-client/wiki/BuildingTheLibrary), including disabling ARC for the library files?
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