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  "title" : "CFError userInfo Dictionary Keys"
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# CFError userInfo Dictionary Keys

Keys in the userInfo dictionary of a `CFError` object when certain CFURL functions return an error.

## Topics

### Constants

[`let kCFURLKeysOfUnsetValuesKey: CFString!`](/documentation/CoreFoundation/kCFURLKeysOfUnsetValuesKey)

Key for the resource properties that have not been set after the [`CFURLSetResourcePropertiesForKeys(_:_:_:)`](/documentation/CoreFoundation/CFURLSetResourcePropertiesForKeys(_:_:_:)) function returns an error, returned as an array of `CFString` objects.


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