macos - 如何使用 Swift 从 OS X 获取 MAC 地址

Question

是否可以使用 Swift 获取 MAC 地址？

MAC 地址是 Wi-Fi 或机场的主要地址。

我正在尝试制作一个 OS X 应用程序。

Answer 1

Apple 的示例代码来自 https://developer.apple.com/library/mac/samplecode/GetPrimaryMACAddress/Introduction/Intro.html检索以太网MAC地址可以被翻译成 swift 。我只保留了最重要的注释，更多的解释可以在原代码中找到。

// Returns an iterator containing the primary (built-in) Ethernet interface. The caller is responsible for
// releasing the iterator after the caller is done with it.
func FindEthernetInterfaces() -> io_iterator_t? {

    let matchingDictUM = IOServiceMatching("IOEthernetInterface");
    // Note that another option here would be:
    // matchingDict = IOBSDMatching("en0");
    // but en0: isn't necessarily the primary interface, especially on systems with multiple Ethernet ports.

    if matchingDictUM == nil {
        return nil
    }
    let matchingDict = matchingDictUM.takeUnretainedValue() as NSMutableDictionary
    matchingDict["IOPropertyMatch"] = [ "IOPrimaryInterface" : true]

    var matchingServices : io_iterator_t = 0
    if IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDict, &matchingServices) != KERN_SUCCESS {
        return nil
    }

    return matchingServices
}

// Given an iterator across a set of Ethernet interfaces, return the MAC address of the last one.
// If no interfaces are found the MAC address is set to an empty string.
// In this sample the iterator should contain just the primary interface.
func GetMACAddress(intfIterator : io_iterator_t) -> [UInt8]? {

    var macAddress : [UInt8]?

    var intfService = IOIteratorNext(intfIterator)
    while intfService != 0 {

        var controllerService : io_object_t = 0
        if IORegistryEntryGetParentEntry(intfService, "IOService", &controllerService) == KERN_SUCCESS {

            let dataUM = IORegistryEntryCreateCFProperty(controllerService, "IOMACAddress", kCFAllocatorDefault, 0)
            if dataUM != nil {
                let data = dataUM.takeRetainedValue() as! NSData
                macAddress = [0, 0, 0, 0, 0, 0]
                data.getBytes(&macAddress!, length: macAddress!.count)
            }
            IOObjectRelease(controllerService)
        }

        IOObjectRelease(intfService)
        intfService = IOIteratorNext(intfIterator)
    }

    return macAddress
}


if let intfIterator = FindEthernetInterfaces() {
    if let macAddress = GetMACAddress(intfIterator) {
        let macAddressAsString = ":".join(macAddress.map( { String(format:"%02x", $0) } ))
        println(macAddressAsString)
    }

    IOObjectRelease(intfIterator)
}

唯一“棘手”的部分是如何使用 Unmanaged 对象，那些在我的代码中有后缀 UM。

函数不返回错误代码，而是返回一个可选的如果函数失败，则值为 nil。

---

Swift 3 更新:

func FindEthernetInterfaces() -> io_iterator_t? {

    let matchingDict = IOServiceMatching("IOEthernetInterface") as NSMutableDictionary
    matchingDict["IOPropertyMatch"] = [ "IOPrimaryInterface" : true]

    var matchingServices : io_iterator_t = 0
    if IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDict, &matchingServices) != KERN_SUCCESS {
        return nil
    }

    return matchingServices
}

func GetMACAddress(_ intfIterator : io_iterator_t) -> [UInt8]? {

    var macAddress : [UInt8]?

    var intfService = IOIteratorNext(intfIterator)
    while intfService != 0 {

        var controllerService : io_object_t = 0
        if IORegistryEntryGetParentEntry(intfService, "IOService", &controllerService) == KERN_SUCCESS {

            let dataUM = IORegistryEntryCreateCFProperty(controllerService, "IOMACAddress" as CFString, kCFAllocatorDefault, 0)
            if let data = dataUM?.takeRetainedValue() as? NSData {
                macAddress = [0, 0, 0, 0, 0, 0]
                data.getBytes(&macAddress!, length: macAddress!.count)
            }
            IOObjectRelease(controllerService)
        }

        IOObjectRelease(intfService)
        intfService = IOIteratorNext(intfIterator)
    }

    return macAddress
}

if let intfIterator = FindEthernetInterfaces() {
    if let macAddress = GetMACAddress(intfIterator) {
        let macAddressAsString = macAddress.map( { String(format:"%02x", $0) } )
            .joined(separator: ":")
        print(macAddressAsString)
    }

    IOObjectRelease(intfIterator)
}