xcode - 在 Swift 中创建套接字

Question

我正在尝试用 swift 编写一个简单的回显服务器。我找到的例子是 non-functional and low-level或written in objective-c .

我在很多事情上都失败了，我会从头开始。我无法使用 CFSocketCreate 等高级函数创建一个简单的套接字。这就是我最终得到的结果:

class EchoServer : NSObject, NSStreamDelegate
{
    private var serverSocket: CFSocketRef?

    func start()
    {
        self.serverSocket = CFSocketCreate(kCFAllocatorDefault, AF_INET, SOCK_STREAM, 0, 2, &self.acceptConnection, NSNull())
    }

    func acceptConnection(socket: CFSocketRef, type: CFSocketCallBackType, address: CFDataRef, data: UnsafePointer<Void>, info: UnsafeMutablePointer<Void>)
    {
        // Accept connection and stuff later
    }
}

我是 xcode/objectivec/swift 的新手，我什至很难理解错误消息。上面的代码让我简单地留下了

EchoServer.swift:31:93: '(CFSocketRef, type: CFSocketCallBackType, address: CFDataRef, data: UnsafePointer, info: UnsafeMutablePointer) -> ()' is not convertible to '@lvalue inout $T10'

我什至无法弄清楚这一点。

Answer 1

如果有人仍在寻找这个问题的答案。我稍微修改了代码。回调中存在一些打字问题，而且它不可能是类中的函数。

import CoreFoundation

func acceptConnection(socket: CFSocket!, type: CFSocketCallBackType, address: CFData!, data: UnsafePointer<Void>, info: UnsafeMutablePointer<Void>)
{
    // Accept connection and stuff later
}

class EchoServer : NSObject, NSStreamDelegate
{
    private var serverSocket: CFSocketRef?

    func start()
    {
        self.serverSocket = CFSocketCreate(kCFAllocatorDefault, AF_INET, SOCK_STREAM, 0, 2, acceptConnection, nil)
    }
}