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2009-11-03T15:54:05.340
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You write that it crashes when you access <code>IdataManager</code>. This is not true. You're program crashes when you try to access the <code>CurrentCandidate</code> object you received using the following line: <pre><code>// read about naming methods here: http://cocoadevcentral.com/articles/000082.php CCandidate *currentCandidate = [IdataManager CurrentCandidate]; </code></pre> I suspect you're releasing <code>currentCandidate</code> somewhere you shouldn't. It works the first time because you get back an autoreleased object (You musn't release those yourself!). This is how it goes: First time: <ol> <li>Get autoreleased <code>currentCandidate</code>. retain count == 2</li> <li><your code></li> <li><code>[currentCandidate release]</code> or <code>[currentCandidate autorelease]</code> retain count == 1</li> <li><your code></li> <li>All autoreleased objects get released. retain count == 0</li> <li><code>currentCandidate</code> gets deallocated.</li> </ol> Second time: <ol> <li>Get autoreleased <code>currentCandidate</code>. This is an invalid object that has already been deallocated. -> CRASH.</li> </ol> <hr> If <code>[IdataManager CurrentCandidate</code>] doesn't return an autoreleased object as it should but instead just the pointer to the member of <code>IdataManager</code>, the code crashes later when accessing <code>currentCandidate</code>. The fact that adding <code>retain</code> helps proves that you're releasing <code>currentCandidate</code> somewhere. Either directly, via autorelease or though some other algorithm. All classes from Apple only release objects that they've retained earlier on. Somewhere in your code there's an unbalanced <code>retain</code>/<code>release</code>.
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1. POQuestion about pointers in Objective-C
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1. USGeorg Schölly
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