如何使用代码检测 usb swift 代码 Macos 的输出？

Question

我发现这段代码工作正常

连接 iPhone/iPad：Matched 断开连接 iPhone/iPad：Terminated

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
    )?


    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")

        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)
            as NSMutableDictionary
        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(
                    event: .Matched, iterator: iterator
                )
        };
        let termCallback: IOServiceMatchingCallback = {
            (userData, iterator) in
                let detector = Unmanaged<IOUSBDetector>
                    .fromOpaque(userData!).takeUnretainedValue()
                detector.dispatchEvent(
                    event: .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.terminatedIterator
        )

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

        // This is required even if nothing was found to "arm" the callback
        self.dispatchEvent(event: .Matched, iterator: self.matchedIterator)
        self.dispatchEvent(event: .Terminated, iterator: self.terminatedIterator)

        return true
    }


    func stopDetection ( ) {
        guard self.matchedIterator != 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("\(event)")
};
_ = test?.startDetection()
while true { sleep(1) }

当 iphone 连接成功时，我想运行一些更多的命令替代：print("\(event)")，我写：

if event == "Matched" {
//run some more commands 
} else {
//Terminated
}

但是swift报错：Referencing operator function '==' on 'StringProtocol' requires that 'IOUSBDetector.Event' conform to 'StringProtocol'

你能帮我使用这段代码的输出，写一个条件来在找到 iphone 时执行我的一些可选命令，反之亦然吗？

我想我可能需要将事件值转换为字符串值？

Answer 1

事件不是字符串而是枚举。

将“匹配”更改为 .Matched

如何使用代码检测 usb swift 代码 Macos 的输出？

How to use output with code detect usb swift code Macos?

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