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Re: NSXMLNode's `stringValue' method and memory leaks
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Re: NSXMLNode's `stringValue' method and memory leaks


  • Subject: Re: NSXMLNode's `stringValue' method and memory leaks
  • From: Glen Simmons <email@hidden>
  • Date: Fri, 2 Dec 2005 18:47:30 -0600


On Dec 2, 2005, at 6:36 PM, Damien Sorresso wrote:

I'm using NSXMLNode's `stringValue' method to get the raw string value of an XML node, but it seems like every time I call this method, I get

2005-12-02 18:15:20.818 XMLTest[15637] *** _NSAutoreleaseNoPool(): Object 0x307ea0 of class NSCFString autoreleased with no pool in place - just leaking

in the run log. But from what I can tell, the object it returns isn't autoreleased. The assignment statement is

curVal = [[names objectAtIndex:i] stringValue];

The `names' array contains `NSXMLNode' objects, and it is obtained from a `NSXMLNode' passed into the function. Every time the above statement is executed, the aforementioned message is printed to the console. The address of the object in the message is always the same as the address of `curVal'.

What's going on here?

You need an autorelease pool. Even though you aren't autoreleasing anything, Cocoa obviously is. *Any* interaction with Cocoa may create autoreleased objects that you don't know about. Since the main thread already has an autorelease pool in place, I'm guessing you're doing this on a secondary thread. If you check the docs, it says somewhere to always begin your threaded method with

NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

and end it with

[pool release];


Glen Simmons
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