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POObjective-C: Is there any way to find out what kind of object resides at a particular memory address?
 

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    <p>Coming from Java and Python, I am not so well versed in memory management, but is there any way to find out what kind of object resides at a particular memory address? </p> <p>I am asking because my application terminated with a cryptic message that reads: </p> <p><code>Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSDecimalNumber encodedURLParameterString]: unrecognized selector sent to instance 0x164840'</code></p> <p>and would like to get some clues as to what is going wrong.</p> <p>And if that is not possible, some debugging techniques for such error messages would be greatly appreciated.</p> <p>Thanks in advance!! </p> <p><strong>EDIT: Follow Up Concern (MOVED <a href="https://stackoverflow.com/questions/3270071/nsstring-string-somestring-vs-nsstring-string-nsstring-alloc-initwith">HERE</a>)</strong> </p> <p>After some investigation of the framework that I have been using, I came across something that I don't really understand. </p> <p>If I have a method</p> <pre><code>- (void) myMethod:(NSString *)string { [Object anothermethodWithString:string]; } </code></pre> <p>and I call </p> <pre><code>[Object myMethod:@"this is a string"]; </code></pre> <p>Do I need to do something like</p> <pre><code>NSString *string2 = [[NSString alloc] initWithFormat:@"%@", string]; [Object anothermethodWithString:string2]; [string2 release]; </code></pre> <p>instead of the way I had myMethod before? It seems like the string I passed through the parameter of my method got released somewhere, and doing that solves my problem. I guess I don't really understand what exactly @"string" does in terms of memory. Is it like an auto-released NSString? </p>
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    1. USAyaka Nonaka
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    1. COThere is something wrong with the definition of myMethod in your follow-up question. What looks like a call to anothermethod... is not valid Objective-C. In any case: no you don't have to create a new string when you pass it on. Another thing: since your follow-up is unrelated to your original question, you should post it as a separate question. That will be more useful for other people with similar concerns.
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    2. CO@Felixyz Whoops, sorry. I wrote the example method when my brain was fried from trying to debug. It should be fixed now. And thanks for the suggestion. I'll re-post it, especially since the behavior of my code tells me that the string is somehow being lost.
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