How to use getInputStream() on NSNetService in Swift?

I’m trying to set up an NSInputStream and NSOutputStream for a Bonjour connection on a NSNetService. The getInputStream method requires arguments of the type UnsafeMutablePointer<NSInputStream?>:

public func getInputStream(inputStream: UnsafeMutablePointer<NSInputStream?>, outputStream: UnsafeMutablePointer<NSOutputStream?>) -> Bool

But when I do this the inputStream and the outputStream stay nil and succes is false:

    let inputStream:UnsafeMutablePointer<NSInputStream?> = nil
    let outputStream:UnsafeMutablePointer<NSOutputStream?> = nil

    var succes = service.getInputStream(inputStream, outputStream: outputStream)

Another problem is that I cannot approach it as an ‘NSInputStream’ because it of type ‘UnsafeMutablePointer,’. When I try this I get the following error:

Error:(52, 13) value of type 'UnsafeMutablePointer<NSInputStream?>' (aka 'UnsafeMutablePointer<Optional<NSInputStream>>') has no member 'delegate'

What is the right way to handle these mutable pointer types in swift? Any help would be greatly appreciated, thanks!

Your pointers are nil because you did not allocate memory for them. But the easier solution is to pass NSIn/OutputStream? variables as inout-argument with &:

var inputStream : NSInputStream?
var outputStream : NSOutputStream?

let success = service.getInputStream(&inputStream, outputStream: &outputStream)