Re: [OBJC newbie] - Intance variable becomes 'invalid'

FROM : Robert Walker
DATE : Wed May 31 20:58:32 2006

Graham,

Study this guide very closely.  It will explain, hopefully, all you 
need to know about memory management in Cocoa/ObjC:

http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/
index.html

On May 31, 2006, at 2:51 PM, Graham wrote:

> Just learning OBJC...
>
> I have a class with an NSString * instance variable.
> Class has two methods, method a sets a value into the string, when 
> method b is called and tries to access the string it crashes my 
> app. gdb says the string instance is 'invalid'.
> How can an instance variable become invalid? What does it even mean?
> I suspect that since OBJC uses pointers everywhere that the 
> instance got stamped on somehow?
> I have been living in the safe world of Java for too long I fear.
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--
Robert Walker
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