在Swift中安装一个力反馈装置

我可以得到一个像这样的隐藏设备

import ForceFeedback
import IOKit.hid

private func createDeviceMatchingDictionary( usagePage: Int, usage: Int) -> CFMutableDictionary {
    let dict = [
        kIOHIDDeviceUsageKey: usage,
        kIOHIDDeviceUsagePageKey: usagePage
        ] as NSDictionary

    return dict.mutableCopy() as! NSMutableDictionary;
}

let manager = IOHIDManagerCreate(kCFAllocatorDefault, IOOptionBits(kIOHIDOptionsTypeNone));
let trackpad = createDeviceMatchingDictionary(usagePage: kHIDPage_GenericDesktop, usage: kHIDUsage_GD_Mouse)

IOHIDManagerOpen(manager, IOOptionBits(kIOHIDOptionsTypeNone) )
IOHIDManagerSetDeviceMatching(manager, trackpad)

let devices = IOHIDManagerCopyDevices(manager)

但是，这些都不会返回使用

FFCreateDevice（）

---

如何获得forcefeedback设备并在其上使用

FFCreateEffect

？

许多Objective-C或C风格框架背后的想法是，您为预期由函数创建的对象传入指针，函数返回代码，以便您知道操作是否成功

您可以使用

IOHIDDeviceGetService（设备）

获取您的

io\u服务。然后可以创建类型为
FFDeviceObjectReference
的可选对象，并将其引用传递给
FFCreateDevice
。下面是一个（未经测试）的示例，它似乎应该可以工作：

import IOKit.hid
import ForceFeedback

class ForceFeedback {

    public func listen() {

        let hidManager = IOHIDManagerCreate(kCFAllocatorDefault, IOOptionBits(kIOHIDOptionsTypeNone))
        let hidDevices = [
            kIOHIDDeviceUsagePageKey: kHIDPage_GenericDesktop,
            kIOHIDDeviceUsageKey: kHIDUsage_GD_Mouse
        ]

        IOHIDManagerSetDeviceMatching(hidManager, hidDevices as CFDictionary)

        let deviceMatchingCallback: IOHIDDeviceCallback = {context, result, sender, device in

            var ffDevice: FFDeviceObjectReference? = nil
            let result = FFCreateDevice(IOHIDDeviceGetService(device), &ffDevice)
            if result != FF_OK {
                print("could not create force feedback device")
            }

            var ffEffect: FFEffectObjectReference? = nil
            var effectDefinition = FFEFFECT() // You'd create your effect here

            // Pick your UUID and build it here. For example, this is the constant force effect type
            // E559C460-C5CD-11D6-8A1C-00039353BD00
            let constantForce: CFUUID = CFUUIDCreateWithBytes(kCFAllocatorDefault,
                                                              0xE5, 0x59, 0xC4, 0x60, 0xC5, 0xCD, 0x11, 0xD6,
                                                              0x8A, 0x1C, 0x00, 0x03, 0x93, 0x53, 0xBD, 0x00)

            let effectResult = FFDeviceCreateEffect(ffDevice, constantForce, &effectDefinition, &ffEffect)
            if effectResult != FF_OK {
                print("could not create effect")
            }

            // Start and stop your effect
            // Don't forget to clean up your ffDevice and ffEffect when done.
        }

        // bridge your context and send it as a parameter instead of nil if needed
        IOHIDManagerRegisterDeviceMatchingCallback(hidManager, deviceMatchingCallback, nil)

        IOHIDManagerScheduleWithRunLoop(hidManager, CFRunLoopGetCurrent(), CFRunLoopMode.defaultMode.rawValue)
        CFRunLoopRun()
    }

}

请注意，我注册了HID回调，以便在添加设备时运行代码。
它无法成功创建forcefeedback设备，结果等于
-2147483644
，除了
FFERR_INTERNAL
之外，我无法将其与任何返回值进行比较，因为
整数文本“…”在存储到带符号的“Builtin.Int32”中时溢出。我试图将结果与
FFERR\u INVALIDPARAM
FFERR\u NOINTERFACE
FFERR\u OUTOFMEMORY
和
FFERR\u INTERNAL
进行比较，但我无法打印或与前3mmm进行比较。我在尝试打印这些FFERR值时也会出现溢出错误。似乎这个框架还没有得到苹果公司的青睐。请看ForceFeedback.swift in。这家伙已经声明了自定义枚举中的所有错误代码
-2147483644
对应于那里的
noInterface
，但我不知道从那里去哪里。