9

只是在 swift 3 中尝试 Bonjour

这是我的代码，我可以接收委托

func netServiceDidResolveAddress(_ sender: NetService) {
 print("netServiceDidResolveAddress service name \(sender.name) of type \(sender.type)," +
                "port \(sender.port), addresses \(sender.addresses)")
}

这是我的结果

netServiceDidResolveAddress 服务名称 Webber 的 Mac mini 类型 _myapp._tcp.，端口 5678，地址可选（[<1002162e c0a80205 00000000 00000000>，<1c1e162e 00000000 fe800000 00000000 00bce07ad 24b0040>]）

c0a80205 是我要找的 IP => 192.168.2.5

地址是 [Data] ，Apple 说

服务的地址。这是一个 NSData 实例的 NSArray，每个实例都包含一个适合与 connect(2) 一起使用的 struct sockaddr。如果没有为服务解析地址或尚未解析服务，则返回一个空的 NSArray。

我仍然很困惑为什么 Data 不能使用 .btyes ？正如苹果所说“这是一个 NSArray 的 NSData 实例”但我不能像 NSData 一样使用它

以及如何将地址解析为可读的 IP 字符串？

我之前尝试过这个，但没有得到结果，因为我除了......

let thedata = NSData(bytes: sender.addresses, length: (sender.addresses?.count)!)
var storage = sockaddr_storage()
thedata.getBytes(&storage, length: sizeof(sockaddr_storage))

if Int32(storage.ss_family) == AF_INET {
    let addr4 = withUnsafePointer(&storage) {UnsafePointer<sockaddr_in>($0).pointee }
    print(inet_ntoa(addr4.sin_addr));
}

任何建议都会有所帮助，谢谢

4

4 回答 4

15

这是我在 Swift 3 中的做法。 

func netServiceDidResolveAddress(_ sender: NetService) {
    var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
    guard let data = sender.addresses?.first else { return }
    data.withUnsafeBytes { (pointer:UnsafePointer<sockaddr>) -> Void in
        guard getnameinfo(pointer, socklen_t(data.count), &hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 else {
            return
        }
    }
    let ipAddress = String(cString:hostname)
    print(ipAddress)
}

斯威夫特 5

var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
data.withUnsafeBytes { (pointer: UnsafeRawBufferPointer) -> Void in
        let sockaddrPtr = pointer.bindMemory(to: sockaddr.self)
        guard let unsafePtr = sockaddrPtr.baseAddress else { return }
        guard getnameinfo(unsafePtr, socklen_t(data.count), &hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 else {
            return
        }
    }
let ipAddress = String(cString:hostname)
print(ipAddress)
于 2017-03-27T19:25:11.593 回答
8

编辑了 Swift 5.0 无警告解决方案的 Phil Coles 答案：

func netServiceDidResolveAddress(_ sender: NetService) {
        var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
        guard let data = sender.addresses?.first else { return }
        data.withUnsafeBytes { ptr in
            guard let sockaddr_ptr = ptr.baseAddress?.assumingMemoryBound(to: sockaddr.self) else {
                // handle error
                return
            }
            var sockaddr = sockaddr_ptr.pointee
            guard getnameinfo(sockaddr_ptr, socklen_t(sockaddr.sa_len), &hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 else {
                return
            }
        }
        let ipAddress = String(cString:hostname)
        print(ipAddress)
    }
于 2019-06-10T11:22:32.410 回答
4

好的...这不是一个聪明的答案，至少我可以获得可读的IP

只需使用此函数获取 IP 字符串

let bonjourDevices = [NetService]()

let bonjourDevice = bonjourDevices[0] 

let host = self.getIPV4StringfromAddress(address:bonjourDevice.addresses!)


func getIPV4StringfromAddress(address: [Data] , port : Int ) -> String{

        let data = address.first! as NSData;

        var ip1 = UInt8(0)
        data.getBytes(&ip1, range: NSMakeRange(4, 1))

        var ip2 = UInt8(0)
        data.getBytes(&ip2, range: NSMakeRange(5, 1))

        var ip3 = UInt8(0)
        data.getBytes(&ip3, range: NSMakeRange(6, 1))

        var ip4 = UInt8(0)
        data.getBytes(&ip4, range: NSMakeRange(7, 1))

        let ipStr = String(format: "%d.%d.%d.%d:%d",ip1,ip2,ip3,ip4,port);

        return ipStr;
    }
于 2016-07-06T02:18:24.697 回答
3

我不能使它与 一起使用Data，但是使用NSData，我会使用它：

extension NSData {
    func castToCPointer<T>() -> T {
        let mem = UnsafeMutablePointer<T>.allocate(capacity: MemoryLayout<T.Type>.size)
        self.getBytes(mem, length: MemoryLayout<T.Type>.size)
         return mem.move()
    }
}

所以我们有netServiceDidResolveAddress：

func netServiceDidResolveAddress(_ sender: NetService) {
    if let addresses = sender.addresses, addresses.count > 0 {
        for address in addresses {
            let data = address as NSData

            let inetAddress: sockaddr_in = data.castToCPointer()
            if inetAddress.sin_family == __uint8_t(AF_INET) {
                if let ip = String(cString: inet_ntoa(inetAddress.sin_addr), encoding: .ascii) {
                    // IPv4
                    print(ip)
                }
            } else if inetAddress.sin_family == __uint8_t(AF_INET6) {
                let inetAddress6: sockaddr_in6 = data.castToCPointer()
                let ipStringBuffer = UnsafeMutablePointer<Int8>.allocate(capacity: Int(INET6_ADDRSTRLEN))
                var addr = inetAddress6.sin6_addr

                if let ipString = inet_ntop(Int32(inetAddress6.sin6_family), &addr, ipStringBuffer, __uint32_t(INET6_ADDRSTRLEN)) {
                    if let ip = String(cString: ipString, encoding: .ascii) {
                        // IPv6
                        print(ip)
                    }
                }

                ipStringBuffer.deallocate(capacity: Int(INET6_ADDRSTRLEN))
            }
        }
    }
}

我得到以下结果（在显示之前将 ips 存储在数组中）：

["172.16.10.120", "172.16.8.251", "::", "::82c9:d9a5:2eed:1c87"]

受https://gist.github.com/agrippa1994/d8c66a2ded74fb2dd801启发的代码，用 Swift 2.3 编写并适用于 Swift 3.0

于 2016-11-01T14:14:48.773 回答