Swift 3 - 将 c 结构 sockaddr_in 转换为 CFData

Question

我需要你的帮助，这段代码在 Swift 3 中不再编译

//: Let's set up the `sockaddr_in` C structure using the initializer.
var sin = sockaddr_in(
    sin_len: UInt8(sizeof(sockaddr_in)),
    sin_family: sa_family_t(AF_INET),
    sin_port: in_port_t(0),
    sin_addr: in_addr(s_addr: inet_addr(routerIP)),
    sin_zero: (0,0,0,0,0,0,0,0)
)

//: Now convert the structure into a `CFData` object.
let data = withUnsafePointer(&sin) { ptr in
    CFDataCreate(kCFAllocatorDefault, UnsafePointer(ptr), sizeof(sockaddr_in))
}

//: Create the `CFHostRef` with the `CFData` object and store the retained value for later use.
host = CFHostCreateWithAddress(kCFAllocatorDefault, data).takeRetainedValue()

我必须修复“withUnsafePointer”这一行，但我不知道如何解决？

我试过这样的事情

    let data = withUnsafePointer(to: &sin) { ptr in
        CFDataCreate(kCFAllocatorDefault, UnsafePointer(ptr), MemoryLayout<sockaddr_in>.size)
    }

编译器说我必须使用 withMemoryRebound 但如何使用？谢谢

Answer 1

NSData有一种方便的方法可以帮助您解决此问题，然后您可以利用免费桥接将其转换为CFData：

let data = NSData(bytes: &sin, length: MemoryLayout<sockaddr_in>.size) as CFData