On 12 Sep 2016, at 20:39, Bouke Haarsma via swift-users <swift-users@swift.org>
wrote:
> So the question remains on how to perform the casts using Swift?
In general it’s best to avoid special casing your network protocols. The best
option for doing that is <x-man-page://3/getaddrinfo> and
<x-man-page://3/getnameinfo> calls. Specifically, with `getnameinfo`, if you
specify `NI_NUMERICHOST` it’ll give you back an string representation of the
address without hitting the DNS. Better yet, it starts with a (const sockaddr
*), so you don’t need to extract the IP address from your CFData, you just need
the base address of that data as the right type, and the `Data` type makes that
easy.
So, assuming `addrCF` is your CFData, here’s how to get a string representation.
let addr = addrCF as NSData as Data
let saLen = socklen_t(addr.count)
let addrStr = addr.withUnsafeBytes { (sa: UnsafePointer<sockaddr>) -> String in
var addrStrC = [CChar](repeating: 0, count: Int(NI_MAXHOST))
let err = getnameinfo(sa, saLen, &addrStrC, saLen, nil, 0, NI_NUMERICHOST |
NI_NUMERICSERV)
guard err == 0 else { fatalError() }
return String(utf8String: addrStrC)!
}
Share and Enjoy
--
Quinn "The Eskimo!" <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
_______________________________________________
swift-users mailing list
swift-users@swift.org
https://lists.swift.org/mailman/listinfo/swift-users
