我试图使用NSEvent（cgEvent：event）将CGEvent转换为NSEvent以获取按键的字符，但是我收到错误，说它是＆＃34;无效的事件。 ＆＃34;我的代码和错误消息如下。任何帮助，将不胜感激。谢谢！
func myCGEventCallback(proxy : CGEventTapProxy, type : CGEventType, event : CGEvent, refcon : UnsafeMutableRawPointer?) -> Unmanaged<CGEvent>? {
if type == .keyDown {
if let other = NSEvent(cgEvent: event), let chars = other.characters {
debugPrint(chars)
}
}
return Unmanaged.passRetained(event)
}
2017-06-10 23:18:14.233831-0400 RemapEvent[54431:3082409] [default] Invalid event.
2017-06-10 23:18:14.233938-0400 RemapEvent[54431:3082409] *** Assertion failure in -[NSEvent characters], /Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1504.83.101/AppKit.subproj/NSEvent.m:2414
2017-06-10 23:18:14.234153-0400 RemapEvent[54431:3082409] [General] Invalid message sent to event "NSEvent: type=FlagsChanged loc=(580,464.336) time=116091.6 flags=0x40101 win=0x0 winNum=0 ctxt=0x0 keyCode=59"
2017-06-10 23:18:14.234965-0400 RemapEvent[54431:3082409] [General] (
0 CoreFoundation 0x00007fffa16c62cb __exceptionPreprocess + 171
1 libobjc.A.dylib 0x00007fffb64d148d objc_exception_throw + 48
2 CoreFoundation 0x00007fffa16cb042 +[NSException raise:format:arguments:] + 98
3 Foundation 0x00007fffa3113c80 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
4 AppKit 0x00007fff9f2caa64 -[NSEvent characters] + 174
5 RemapEvent 0x0000000100003da9 _TFFC10RemapEvent14ViewController11viewDidLoadFT_T_L_17myCGEventCallbackFT5proxyVs13OpaquePointer4typeOSC11CGEventType5eventCSo7CGEvent6refconGSqSv__GSqGVs9UnmanagedS3___ + 473
6 RemapEvent 0x0000000100004877 _TToFFC10RemapEvent14ViewController11viewDidLoadFT_T_L_17myCGEventCallbackFT5proxyVs13OpaquePointer4typeOSC11CGEventType5eventCSo7CGEvent6refconGSqSv__GSqGVs9UnmanagedS3___ + 55
7 SkyLight 0x00007fffb32c0dca processDecodedEventRef + 204
8 SkyLight 0x00007fffb32c05b4 processEventTapData + 544
9 SkyLight 0x00007fffb319e6db _XPostEventTapData + 280
10 SkyLight 0x00007fffb32c033e eventTapMessageHandler + 137
11 CoreFoundation 0x00007fffa16451ed __CFMachPortPerform + 253
12 CoreFoundation 0x00007fffa16450d9 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
13 CoreFoundation 0x00007fffa1645051 __CFRunLoopDoSource1 + 465
14 CoreFoundation 0x00007fffa163ccc5 __CFRunLoopRun + 2389
15 CoreFoundation 0x00007fffa163c114 CFRunLoopRunSpecific + 420
16 HIToolbox 0x00007fffa0b9debc RunCurrentEventLoopInMode + 240
17 HIToolbox 0x00007fffa0b9dcf1 ReceiveNextEventCommon + 432
18 HIToolbox 0x00007fffa0b9db26 _BlockUntilNextEventMatchingListInModeWithFilter + 71
19 AppKit 0x00007fff9f136a54 _DPSNextEvent + 1120
20 AppKit 0x00007fff9f8b27ee -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 2796
21 AppKit 0x00007fff9f12b3db -[NSApplication run] + 926
22 AppKit 0x00007fff9f0f5e0e NSApplicationMain + 1237
23 RemapEvent 0x000000010000648d main + 13
24 libdyld.dylib 0x00007fffb6db6235 start + 1
)