如何在swift中获取IP地址

问题描述

如何获取本地IpAddress？

How do i get my local IpAddress?

我尝试使用此 Obj C 示例：

当我到达函数 getifaddrs（）时，我无法继续。我不能使用这个功能。

When i get to the function getifaddrs() i can't get any further. i can't use the function.

有没有另外一种方法可以做到这一点，或者我是以错误的方式接近这个？

Is there an alternative way to do this, or am I approaching this the wrong way?

推荐答案

正如在讨论中所说，OP需要Mac上的接口地址而不是我最初认为的iOS设备上的接口地址。问题中引用的代码检查
接口名称en0，它是iPhone上的WiFi接口。在Mac上，检查任何正在运行的界面会产生更多的
感觉。
因此我改写了答案。它现在是
中代码的Swift转换。

As it turned out in the discussion, OP needs the interface address on a Mac and not on an iOS device as I thought initially. The code referenced in the question checks for theinterface name "en0", which is the WiFi interface on the iPhone. On a Mac it makes moresense to check for any "up-and-running" interface instead.Therefore I have rewritten the answer. It is now a Swift translation of the code inDetect any connected network.

getifaddrs（）在中定义< ifaddrs.h> ，默认情况下不包括在内。
因此你必须创建一个桥接头并添加

getifaddrs() is defined in <ifaddrs.h>, which is not included by default.Therefore you have to create a bridging header and add

#include <ifaddrs.h>

以下函数返回
一个数组，其中包含所有本地up-and-的名称运行网络接口。

The following function returnsan array with the names of all local "up-and-running" network interfaces.

func getIFAddresses() -> [String] {
    var addresses = [String]()

    // Get list of all interfaces on the local machine:
    var ifaddr : UnsafeMutablePointer<ifaddrs> = nil
    if getifaddrs(&ifaddr) == 0 {

        // For each interface ...
        var ptr = ifaddr
        while ptr != nil {
            defer { ptr = ptr.memory.ifa_next }

            let flags = Int32(ptr.memory.ifa_flags)
            let addr = ptr.memory.ifa_addr.memory

            // Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
            if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
                if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {

                    // Convert interface address to a human readable string:
                    var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)
                    if (getnameinfo(ptr.memory.ifa_addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),
                        nil, socklen_t(0), NI_NUMERICHOST) == 0) {
                        if let address = String.fromCString(hostname) {
                            addresses.append(address)
                        }
                    }
                }
            }
        }
        freeifaddrs(ifaddr)
    }

    return addresses
}

---

Swift 3的更新：除了采用代码
，
迭代所有接口现在可以使用新的通用
功能：

---

Update for Swift 3: In addition to adopting the code to themany changes in Swift 3,iterating over all interfaces can now use the new generalizedsequence() function:

func getIFAddresses() -> [String] {
    var addresses = [String]()

    // Get list of all interfaces on the local machine:
    var ifaddr : UnsafeMutablePointer<ifaddrs>?
    guard getifaddrs(&ifaddr) == 0 else { return [] }
    guard let firstAddr = ifaddr else { return [] }

    // For each interface ...
    for ptr in sequence(first: firstAddr, next: { $0.pointee.ifa_next }) {
        let flags = Int32(ptr.pointee.ifa_flags)
        let addr = ptr.pointee.ifa_addr.pointee

        // Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
        if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
            if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {

                // Convert interface address to a human readable string:
                var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
                if (getnameinfo(ptr.pointee.ifa_addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),
                                nil, socklen_t(0), NI_NUMERICHOST) == 0) {
                    let address = String(cString: hostname)
                    addresses.append(address)
                }
            }
        }
    }

    freeifaddrs(ifaddr)
    return addresses
}

这篇关于如何在swift中获取IP地址的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！