A while ago, I created a extremely simple Xcode project to test CGEventTap, and it works perfectly fine when I run from Xcode. The code is at the bottom.
However, if I create a new project on Xcode, paste the exactly the same code below, and run from Xcode, I get "Failed to create event tap".
Is there a project setting that I need to change in order to get CGEventTap working? I even tried to copy and paste info.plist from the old testing project to the new one.
I'm very puzzled. Thank you for your help!
// ViewController.swift
import Cocoa
class ViewController: NSViewController {
override func viewDidLoad() {
super.viewDidLoad()
func myCGEventCallback(proxy : CGEventTapProxy, type : CGEventType, event : CGEvent, refcon : UnsafeMutableRawPointer?) -> Unmanaged<CGEvent>? {
if type == .keyDown || type == .keyUp || type == .flagsChanged {
let keyCode = event.getIntegerValueField(.keyboardEventKeycode)
print(keyCode)
}
return Unmanaged.passRetained(event)
}
let eventMask = (1 << CGEventType.keyDown.rawValue) | (1 << CGEventType.keyUp.rawValue) | (1 << CGEventType.flagsChanged.rawValue)
guard let eventTap = CGEvent.tapCreate(tap: .cgSessionEventTap, place: .headInsertEventTap, options: .defaultTap, eventsOfInterest: CGEventMask(eventMask), callback: myCGEventCallback, userInfo: nil) else {
debugPrint("Failed to create event tap")
exit(1)
}
let runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0)
CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, CFRunLoopMode.commonModes)
CGEvent.tapEnable(tap: eventTap, enable: true)
}
override var representedObject: Any? {
didSet {
// Update the view, if already loaded.
}
}
}
// AppDelegate.swift
import Cocoa
@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {
func applicationDidFinishLaunching(_ aNotification: Notification) {
// Insert code here to initialize your application
}
func applicationWillTerminate(_ aNotification: Notification) {
// Insert code here to tear down your application
}
}
The answer was to uncheck Sandbox from capabilities.