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Re: CFPropertyList and NSDictionary/CFDictionary

On Nov 28, 2003, at 02:26 PM, Christopher Corbell wrote:

Is there any toll-free way to get from a CFPropertyListRef to an NSDictionary
(or CFDictionary) and back? I think I can probably use intermediate
NSData/CFDataRef to pass the raw XML data to and from a CFPropertyList and
a corresponding NSData object, but this seems inelegant to me - it's
a non-toll-free bridge between two redundant implementations of roughly
the same functionality. It seems like everything that CFPropertyList does
could have been added as a small extension to NSDictionary / CFDictionary.

CFPropertyListRef isn't any single data type, it's a representative for CFStringRef, CFNumberRef, CFDataRef, CFDateRef, CFDictionaryRef and CFArrayRef (I think that's all of them...). So if you know that a particular CFPropertyListRef is a dictionary, you can freely cast it to CF/NSDictionaryRef. Similarly if you know if follows the other supported types, you can cast freely between them as well. If you need to know what type it is, you can use CFGetTypeID() compared with CFxGetTypeID() (where x is the data type) to figure out what class you are dealing with, but this is rarely needed in practice.
--
Reality is what, when you stop believing in it, doesn't go away.
Failure is not an option. It is a privilege reserved for those who try.

David Duncan
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References: 
 >CFPropertyList and NSDictionary/CFDictionary (From: Christopher Corbell <email@hidden>)



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