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我在 Swift 中做一个反向 DNS，我之前在 Swift 2.2 上的代码运行良好，而且我已经在 Objective-C 中实现了它并且它可以运行。但是我无法让它在 Swift 3.0 中工作

斯威夫特 2.2

//: 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(ip)),
    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.
let host = CFHostCreateWithAddress(kCFAllocatorDefault, data).takeRetainedValue()

//: Now schedule the runloop for the host.
CFHostScheduleWithRunLoop(host!, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode)

var error = CFStreamError()

//: Start the info resolution.
CFHostStartInfoResolution(host!, .Names, &error)

斯威夫特 3.0

//: 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(ip)),
    sin_zero: (0,0,0,0,0,0,0,0)
)

//: Now convert the structure into a `CFData` object.
let data = NSData(bytes: &sin, length: MemoryLayout<sockaddr_in>.size) as CFData

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

//: Now schedule the runloop for the host.
CFHostScheduleWithRunLoop(host!, CFRunLoopGetCurrent(), CFRunLoopMode.defaultMode as! CFString)

var error = CFStreamError()

//: Start the info resolution.
CFHostStartInfoResolution(host!, .Names, &error)

当我运行此代码时，它崩溃了

CFHostScheduleWithRunLoop

任何想法？

4

1 回答 1

2

尝试替换：

CFRunLoopMode.defaultMode as! CFString

和：

CFRunLoopMode.defaultMode!.rawValue
于 2016-10-25T20:40:09.083 回答