以下代码可以很好地获取已连接的HID设备列表:
import Foundation
import IOKit
import IOKit.usb
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 keyboard = createDeviceMatchingDictionary(usagePage: kHIDPage_GenericDesktop, usage: kHIDUsage_GD_Keyboard)
IOHIDManagerOpen(manager, IOOptionBits(kIOHIDOptionsTypeNone) )
IOHIDManagerSetDeviceMatching(manager, keyboard)
let devices = IOHIDManagerCopyDevices(manager)
if (devices != nil) {
print("Found devices!")
}
else {
print("Did not find any devices :(")
}
如果我把相同的代码放在Cocoa应用程序中,在applicationDidFinishLaunching
中,那么devices
就是nil
。
如何在Cocoa应用程序中获取设备列表?
为什么IOHIDManagerCopyDevices()
只在Cocoa应用程序中运行时才返回任何内容?我错过了什么?
AHA!
在XCode项目中包含一个.entitlements
文件,你需要为com.apple.security.device.usb
添加一行,并为Cocoa项目设置为“YES”。