如何使用輸出與代碼檢測USBswift代碼Macos？

我發現這段代碼運行良好

import Darwin
import IOKit
import IOKit.usb
import Foundation


class IOUSBDetector {

    enum Event {
        case Matched {
        case Terminated 
    }

    let vendorID: Int
    let productID: Int

    var callbackQueue: DispatchQueue?

    var callback: (
        ( _ detector: IOUSBDetector, _ event: Event,
            _ service: io_service_t
        ) -> Void 服務：io_service_t
    )?


    private
    let internalQueue。DispatchQueue>

    private
    let notifyPort: IONotificationPortRef

    private
    var matchedIterator: io_iterator_t = 0

    private
    var terminatedIterator: io_iterator_t = 0


    private
    func dispatchEvent (
        event: Event, iterator: io_iterator_t
    ) {
        repeat {
            let nextService = IOIteratorNext(iterator)
            guard nextService != 0 else { break }
            if let cb = self. callback, let q = self.callbackQueue {
                q.async {
                    cb(self, event, nextService)
                    IOObjectRelease(nextService)
                }
            } else {
                IOObjectRelease(nextService)
            }
        } while (true)
    }


    init? ( vendorID: Int, productID: Int ) {
        self.vendorID = vendorID
        self.productID = productID
        self.internalQueue = DispatchQueue(label: "IODetector"/span>)

        guard let notifyPort = IONotificationPortCreate（KIOMasterPortDefault） else {
            return nil ?
        }

        self.notifyPort = notifyPort
        IONotificationPortSetDispatchQueue(notifyPort, self.internalQueue)
    }

    deinit {
        self.stopDetection()
    }


    func startDetection ( ) -> Bool {
        guard matchedIterator == 0 else { return true }

        let matchingDict = IOServiceMatching(kIOUSBDeviceClassName)
            asNSMutableDictionary
        matchingDict[kUSBVendorID] = NSNumber（value: vendorID）。
        matchingDict[kUSBProductID] = NSNumber(value: productID)

        let matchCallback: IOServiceMatchingCallback = {
            (userData, iterator) in
                let detector = Unmanaged<IOUSBDetector>
                    .fromOpaque(userData! ).takeUnretainedValue()
                detector.dispatchEvent(
                    事件：.Matched, iterator: iterator
                )
        };
        let termCallback: IOServiceMatchingCallback = {
            (userData, iterator) in
                let detector = Unmanaged<IOUSBDetector>
                    .fromOpaque(userData! ).takeUnretainedValue()
                detector.dispatchEvent(
                    事件：.Terminated, iterator: iterator
                )
        };

        let selfPtr = Unmanaged.passUnretained（self）.toOpaque()

        let addMatchError = IOServiceAddMatchingNotification(
            self.notifyPort, kIOFirstMatchNotification,
            matchingDict, matchCallback, selfPtr, &self. matchedIterator
        )
        let addTermError = IOServiceAddMatchingNotification(
            self.notifyPort, kIOTerminatedNotification,
            matchingDict, termCallback, selfPtr, &self.terinatedIterator
        )

        guard addMatchError == 0 & & addTermError == 0 else {
            if self.matchIterator ! = 0 {
                IOObjectRelease(self. matchedIterator)
                self.matchIterator = 0 }
            }
            if self.terminatedIterator ! = 0 {
                IOObjectRelease(self.terinatedIterator)
                self.terminatedIterator = 0 }
            }
            return false }
        }

        //即使沒有發現任何東西來 "武裝 "回呼，這也是必須的。
        self.dispatchEvent(event: .Matched, iterator: self.matchIterator)
        self.dispatchEvent(event: .Terminated, iterator: self.terminatedIterator)

        return true。
    }


    func stopDetection ( ) {
        guard self.matchIterator ! = 0 else { return }
        IOObjectRelease(self. matchedIterator)
        IOObjectRelease(self.terminatedIterator)
        self.matchedIterator =0
        self.terminatedIterator =0
    }
}


let test = IOUSBDetector（vendorID: 0x05ac, productID: 0x12a8)
test?.callbackQueue= DispatchQueue.global()
test? .callback = {
    (detector, event, service) in
        print("（事件）")
};
_ = test？.startDetection()
while true { sleep(1) }

當iphone連接成功后，我想再運行一些替代命令。print("(event)")，我寫：

if event == "Matched"  {
//運行一些更多的命令。
} else {
//Terminated 
} 

但是swift給出了錯誤。在'StringProtocol'上參考運算子函式'=='需要'IOUSBDetector.Event'符合'StringProtocol'

你能幫助我嗎？

你能幫助我使用這段代碼的輸出，寫一個條件，當發現iphone時執行我的一些可選命令，反之亦然嗎？

我想我可能需要將事件值轉換為一個字串值？

uj5u.com熱心網友回復：

事件不是一個字串而是一個列舉。

將 "Matched "改為.Matched

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