如何在Swift中使用CGEventTapCreate?
有没有人设法使此功能在Swift中工作?
苹果文档:https
:
//developer.apple.com/library/prerelease/mac/documentation/Carbon/Reference/QuartzEventServicesRef/index.html#//apple_ref/c/func/CGEventTapCreate
以下是CGEventTapCallBack的定义方式:
typealias CGEventTapCallBack = CFunctionPointer<((CGEventTapProxy, CGEventType, CGEvent!, UnsafeMutablePointer<Void>) -> Unmanaged<CGEvent>!)>
这是我编写块的方式:
let eventTapCallBackBlock : @objc_block(CGEventTapProxy, CGEventType, CGEventRef, UnsafeMutablePointer<Void>) -> CGEventRef =
{ (eventTapProxy: CGEventTapProxy, eventType: CGEventType, event: CGEventRef, refcon: UnsafeMutablePointer<Void>) in
return event
}
然后我用回调参数调用了CGEventTapCreate unsafeBitCast(eventTapCallBackBlock,
CGEventTapCallBack.self)
我得到了有效的CFMachPortRef
退款,但是在运行时,我在第一个事件中遇到了访问冲突异常。它将“似乎”以其当前发布状态迅速接近一个解决方案。
使用Xcode版本6.4
回答:
的callback
参数CGEventTapCreate()
是C函数指针,在 ,无法通过Swift函数参数调用它。
但是,在 (Xcode 7)中,可以使用闭包或全局函数来调用带有函数指针参数的C函数(但要注意,闭包不得捕获其任何本地上下文)。
例如,以下是 对Swift
的接收,筛选和修改按键和释放的完整翻译 :
import Foundationfunc myCGEventCallback(proxy : CGEventTapProxy, type : CGEventType, event : CGEvent, refcon : UnsafeMutablePointer<Void>) -> Unmanaged<CGEvent>? {
if [.KeyDown , .KeyUp].contains(type) {
var keyCode = CGEventGetIntegerValueField(event, .KeyboardEventKeycode)
if keyCode == 0 {
keyCode = 6
} else if keyCode == 6 {
keyCode = 0
}
CGEventSetIntegerValueField(event, .KeyboardEventKeycode, keyCode)
}
return Unmanaged.passRetained(event)
}
let eventMask = (1 << CGEventType.KeyDown.rawValue) | (1 << CGEventType.KeyUp.rawValue)
guard let eventTap = CGEventTapCreate(.CGSessionEventTap,
.HeadInsertEventTap,
.Default,
CGEventMask(eventMask),
myCGEventCallback,
nil) else {
print("failed to create event tap")
exit(1)
}
let runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0)
CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopCommonModes)
CGEventTapEnable(eventTap, true)
CFRunLoopRun()
更新
import Foundationfunc myCGEventCallback(proxy: CGEventTapProxy, type: CGEventType, event: CGEvent, refcon: UnsafeMutableRawPointer?) -> Unmanaged<CGEvent>? {
if [.keyDown , .keyUp].contains(type) {
var keyCode = event.getIntegerValueField(.keyboardEventKeycode)
if keyCode == 0 {
keyCode = 6
} else if keyCode == 6 {
keyCode = 0
}
event.setIntegerValueField(.keyboardEventKeycode, value: keyCode)
}
return Unmanaged.passRetained(event)
}
let eventMask = (1 << CGEventType.keyDown.rawValue) | (1 << CGEventType.keyUp.rawValue)
guard let eventTap = CGEvent.tapCreate(tap: .cgSessionEventTap,
place: .headInsertEventTap,
options: .defaultTap,
eventsOfInterest: CGEventMask(eventMask),
callback: myCGEventCallback,
userInfo: nil) else {
print("failed to create event tap")
exit(1)
}
let runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0)
CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, .commonModes)
CGEvent.tapEnable(tap: eventTap, enable: true)
CFRunLoopRun()
以上是 如何在Swift中使用CGEventTapCreate? 的全部内容, 来源链接: utcz.com/qa/397249.html