Programmatically Toggle the Caps Lock Key

Hey Folks,

Someone posted this and then withdrew it.

I tested the code, and it works perfectly on my macOS 10.12.6 Sierra system, so I'm posting it for posterity.

Our own @CJK gets the credit.

-Chris


// --------------------------------------------------------
// @CJK
// 2019.06.02 · 15:49
// Toggle caps lock programmatically using AppleScript
// https://apple.stackexchange.com/questions/361373/toggle-caps-lock-programmatically-using-applescript
// --------------------------------------------------------

ObjC.import("IOKit");
ObjC.import("CoreServices");


(() => {
    var ioConnect = Ref();
    var state = Ref();

    $.IOServiceOpen(
        $.IOServiceGetMatchingService(
            $.kIOMasterPortDefault,
            $.IOServiceMatching(
                $.kIOHIDSystemClass
            )
        ),
        $.mach_task_self_,
        $.kIOHIDParamConnectType,
        ioConnect
    );
    $.IOHIDGetModifierLockState(ioConnect, $.kIOHIDCapsLockState, state);
    $.IOHIDSetModifierLockState(ioConnect, $.kIOHIDCapsLockState, !state[0]);
    $.IOServiceClose(ioConnect);
})();
1 Like

On Catalina and Big Sur it only activates the CAPSLOCK, but doesn't deactivate it.