import Cocoa
let pid = pid_t(CommandLine.arguments[1])!
let app = AXUIElementCreateApplication(pid)
var focused: CFTypeRef?
AXUIElementCopyAttributeValue(app, kAXFocusedUIElementAttribute as CFString, &focused)
if let f = focused {
    var r1: CFTypeRef?
    AXUIElementCopyAttributeValue(f as! AXUIElement, kAXRoleAttribute as CFString, &r1)
    print("focused role: \(r1 as? String ?? "?")")
    let setR = AXUIElementSetAttributeValue(f as! AXUIElement, kAXValueAttribute as CFString, "ZYSET-PROBE" as CFTypeRef)
    print("set value result: \(setR.rawValue) (0=success)")
    // 立即清空，不留痕
    AXUIElementSetAttributeValue(f as! AXUIElement, kAXValueAttribute as CFString, "" as CFTypeRef)
} else { print("no focused element") }