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# Error Domains

High-level error domains.

## Discussion

To determine the source of an error, examine the `userInfo` dictionary included in the `CFError` object returned by a function call or call <doc://com.apple.documentation/documentation/CoreFoundation/CFErrorGetDomain(_:)> and pass in the `CFError` object and the domain whose value you want to read.

## Topics

### Constants

[`let kCFErrorDomainCFNetwork: CFString`](/documentation/CFNetwork/kCFErrorDomainCFNetwork)

[`let kCFErrorDomainWinSock: CFString`](/documentation/CFNetwork/kCFErrorDomainWinSock)


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