Swift 如何在 NSNetService 上使用 getInputStream()？

Question

我正在尝试为 NSNetService 上的 Bonjour 连接设置 NSInputStream 和 NSOutputStream。 getInputStream 方法需要 UnsafeMutablePointer<NSInputStream?>:

类型的参数

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

但是当我这样做时，inputStream 和 outputStream 保持为 nil，succes 为 false:

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

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

另一个问题是我无法将其作为“NSInputStream”来处理，因为它的类型为“UnsafeMutablePointer”。当我尝试这样做时，出现以下错误：

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

在swift中处理这些可变指针类型的正确方法是什么？任何帮助将不胜感激，谢谢！

Answer 1

您的指针是 nil 因为您没有为它们分配内存。但更简单的解决方案是将 NSIn/OutputStream? 变量传递为输入参数 &:

var inputStream : NSInputStream?
var outputStream : NSOutputStream?

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

Swift 如何在 NSNetService 上使用 getInputStream()？

How to use getInputStream() on NSNetService in Swift?

pointers

nsstream

nsnetservice

swift