I couldn't get any of this to work, but I found relevant Autohotkey functions, and thusly wrote a script:
#NoTrayIcon
#SingleInstance Force
;;; to use this script properly, change the h_device parameter in KeyboardLED()
; (this could be potentially annoying in case you arbitrarily add/remove
; keyboards...)
; i'm just using this script to flash numlock and scrolllock states:
Bell() {
delay = 60
Loop, 4
{
KeyboardLED(1, "switch")
Sleep, %delay%
KeyboardLED(2, "switch")
Sleep, %delay%
}
KeyboardLED(3, "on")
}
Loop, 3
{
Bell()
Sleep, 500
}
Sleep, 500
KeyboardLED(0,"off") ; unpower all LEDs
return
/*
; some example patterns.
Loop, 3 ; flash all LEDs
{
KeyboardLED(7,"on")
Sleep, 500
KeyboardLED(7,"off")
Sleep, 500
}
Loop, 3 ; flash ScrollLock LED
{
KeyboardLED(7,"off")
KeyboardLED(4,"switch")
Sleep, 500
KeyboardLED(7,"off")
Sleep, 500
}
Loop, 3 ; cycle all LEDs left to right
{
KeyboardLED(7,"off")
Sleep, 250
KeyboardLED(2,"switch")
Sleep, 250
KeyboardLED(4,"switch")
Sleep, 250
KeyboardLED(1,"switch")
Sleep, 250
}
Loop, 3 ; progress bar in LEDs
{
KeyboardLED(7,"off")
Sleep, 500
KeyboardLED(2,"switch")
Sleep, 500
KeyboardLED(6,"switch")
Sleep, 500
KeyboardLED(7,"switch")
Sleep, 500
}
Loop, 3 ; Knight Rider KITT cycling all LEDs ;-)
{
KeyboardLED(2,"switch")
Sleep, 500
KeyboardLED(4,"switch")
Sleep, 500
KeyboardLED(1,"switch")
Sleep, 500
KeyboardLED(4,"switch")
Sleep, 500
}
*/
; Keyboard LED control (capslock/numlock/scrolllock lights), thanks to
; http://www.autohotkey.com/forum/viewtopic.php?t=10532
; USAGE: KeyboardLED(LEDvalue,"Cmd")
; @LEDvalue: ScrollLock=1, NumLock=2, CapsLock=4 ; Cmd = on/off/switch
KeyboardLED(LEDvalue, Cmd) ; LEDvalue: ScrollLock=1, NumLock=2, CapsLock=4 ; Cmd = on/off/switch
{
Static h_device
If ! h_device ; initialise
{
;;; increment the digit at the end to discover which keyboard's LEDs you want to control
device =\Device\KeyBoardClass1
SetUnicodeStr(fn,device)
h_device:=NtCreateFile(fn,0+0x00000100+0x00000080+0x00100000,1,1,0x00000040+0x00000020,0)
}
VarSetCapacity( output_actual, 4, 0 )
input_size = 4
VarSetCapacity( input, input_size, 0 )
If Cmd= switch ;switches every LED according to LEDvalue
KeyLED:= LEDvalue
If Cmd= on ;forces all choosen LED's to ON (LEDvalue= 0 ->LED's according to keystate)
KeyLED:= LEDvalue | (GetKeyState("ScrollLock", "T") + 2*GetKeyState("NumLock", "T") + 4*GetKeyState("CapsLock", "T"))
If Cmd= off ;forces all choosen LED's to OFF (LEDvalue= 0 ->LED's according to keystate)
{
LEDvalue:= LEDvalue ^ 7
KeyLED:= LEDvalue & (GetKeyState("ScrollLock", "T") + 2*GetKeyState("NumLock", "T") + 4*GetKeyState("CapsLock", "T"))
}
; EncodeInteger( KeyLED, 1, &input, 2 ) ;input bit pattern (KeyLED): bit 0 = scrolllock ;bit 1 = numlock ;bit 2 = capslock
input := Chr(1) Chr(1) Chr(KeyLED)
input := Chr(1)
input=
success := DllCall( "DeviceIoControl"
, "uint", h_device
, "uint", CTL_CODE( 0x0000000b ; FILE_DEVICE_KEYBOARD
, 2
, 0 ; METHOD_BUFFERED
, 0 ) ; FILE_ANY_ACCESS
, "uint", &input
, "uint", input_size
, "uint", 0
, "uint", 0
, "uint", &output_actual
, "uint", 0 )
}
CTL_CODE( p_device_type, p_function, p_method, p_access )
{
Return, ( p_device_type << 16 ) | ( p_access << 14 ) | ( p_function << 2 ) | p_method
}
NtCreateFile(ByRef wfilename,desiredaccess,sharemode,createdist,flags,fattribs)
{
VarSetCapacity(fh,4,0)
VarSetCapacity(objattrib,24,0)
VarSetCapacity(io,8,0)
VarSetCapacity(pus,8)
uslen:=DllCall("lstrlenW","str",wfilename)*2
InsertInteger(uslen,pus,0,2)
InsertInteger(uslen,pus,2,2)
InsertInteger(&wfilename,pus,4)
InsertInteger(24,objattrib,0)
InsertInteger(&pus,objattrib,8)
status:=DllCall("ntdll\ZwCreateFile","str",fh,"UInt",desiredaccess,"str",objattrib,"str",io,"UInt",0,"UInt",fattribs
,"UInt",sharemode,"UInt",createdist,"UInt",flags,"UInt",0,"UInt",0, "UInt")
return % ExtractInteger(fh)
}
SetUnicodeStr(ByRef out, str_)
{
VarSetCapacity(st1, 8, 0)
InsertInteger(0x530025, st1)
VarSetCapacity(out, (StrLen(str_)+1)*2, 0)
DllCall("wsprintfW", "str", out, "str", st1, "str", str_, "Cdecl UInt")
}
ExtractInteger(ByRef pSource, pOffset = 0, pIsSigned = false, pSize = 4)
; pSource is a string (buffer) whose memory area contains a raw/binary integer at pOffset.
; The caller should pass true for pSigned to interpret the result as signed vs. unsigned.
; pSize is the size of PSource's integer in bytes (e.g. 4 bytes for a DWORD or Int).
; pSource must be ByRef to avoid corruption during the formal-to-actual copying process
; (since pSource might contain valid data beyond its first binary zero).
{
Loop %pSize% ; Build the integer by adding up its bytes.
result += *(&pSource + pOffset + A_Index-1) << 8*(A_Index-1)
if (!pIsSigned OR pSize > 4 OR result < 0x80000000)
return result ; Signed vs. unsigned doesn't matter in these cases.
; Otherwise, convert the value (now known to be 32-bit) to its signed counterpart:
return -(0xFFFFFFFF - result + 1)
}
InsertInteger(pInteger, ByRef pDest, pOffset = 0, pSize = 4)
; The caller must ensure that pDest has sufficient capacity. To preserve any existing contents in pDest,
; only pSize number of bytes starting at pOffset are altered in it.
{
Loop %pSize% ; Copy each byte in the integer into the structure as raw binary data.
DllCall("RtlFillMemory", "UInt", &pDest + pOffset + A_Index-1, "UInt", 1, "UChar", pInteger >> 8*(A_Index-1) & 0xFF)
}