Question

在swift 3中尝试Bonjour

这是我的代码，我可以收到代表

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（[＆lt; 1002162e c0a80205 00000000 00000000＆gt;，＆lt; 1c1e162e 00000000 fe800000 00000000 00bce7ad 24b4b7e8 08000000＆gt;]）

c0a80205是我寻找的IP =＆gt; 192.168.2.5

地址是[数据]，Apple说

服务的地址。这是NSData实例的NSArray，每个包含一个适合使用的结构sockaddr （2）连接。如果没有解决的地址服务或服务尚未解决，空的NSArray是返回。

我仍然混淆为什么数据不能使用.btyes？正如Apple所说“这是NSData实例的NSArray” 但我不能像NSData那样使用它

如何将地址解析为可读IP字符串？

我以前试过这个，但除了......之外没有得到结果......

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

Answer 1

这是我在Swift 3中的表现。

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)
}

Answer 2

好的......这不是一个明智的答案，至少我可以获得可读的IP

只需使用此func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;
    }

Answer 3

我无法使用Data，但使用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))
            }
        }
    }
}

我有以下结果（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Swift 2.3编写的https://gist.github.com/agrippa1994/d8c66a2ded74fb2dd801启发并适用于Swift 3.0的代码

Answer 4

针对Swift 5.0无警告解决方案的编辑过的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)
    }

Swift 3如何解决NetService IP？

4 个答案: