an autohotkey script to quickly change mouse sensitivity

mouse_sensitivity.ahk

;; from http://www.howtogeek.com/howto/45366/how-to-set-different-speeds-for-your-trackpad-and-external-mouse/
#F1::DllCall(“SystemParametersInfo”, Int,113, Int,0, UInt,14, Int,2) ;normal sensisivity
#F2::DllCall(“SystemParametersInfo”, Int,113, Int,0, UInt,6, Int,2) ;low sensitivity
#F3::DllCall(“SystemParametersInfo”, Int,113, Int,0, UInt,20, Int,2) ;high sensitivity

Hi!

I'm working on a Windows 10 System (64-Bit), using AutoHotKeyU64.
These AHK script lines like DllCall(“SystemParametersInfo”, Int,113, Int,0, UInt,14, Int,2) didn't work for me. At first I was clueless why.

After checking AHK variable ErrorLevel I noticed that the name of the procedure wasn't found by AHK (ErrorLevel = -4).
To correct this I added the following lines to the top of my script:
Global SPIProc, User32Module
User32Module := DllCall("GetModuleHandle", Str, "user32", "Ptr")
SPIProc := DllCall("GetProcAddress", "Ptr", User32Module, "AStr", "SystemParametersInfoW", "Ptr")

Please note that usage of "SystemParametersInfo" instead of "SystemParametersInfoW" didn't work, although the documentation of DllCall() expressively states that an "W" or "A" is added in case the simple name isn't found. Luckily the documentation on the microsoft page Documentation SystemParametersInfo taught me the trick (see very much to the end of the page under "Requirements").

Any call to change mouse sensitivity now looks that way:
DllCall( SPIProc, Int, 0x71, Int, 0, UInt, 5, Int, 0) ; Replace the "5" by your desired sensitivity

Perhaps I'm the only one with this problem, but on the other hand my solution might help somebody,

Hello

Can you please post your whole modified script as I'm having the same issue with original code?
Thanks

Edit: It's working like this, hope I did it right

#NoEnv  ; Recommended for performance and compatibility with future AutoHotkey releases.
#Warn  ; Enable warnings to assist with detecting common errors.

Global SPIProc, User32Module
User32Module := DllCall("GetModuleHandle", Str, "user32", "Ptr")
SPIProc := DllCall("GetProcAddress", "Ptr", User32Module, "AStr", "SystemParametersInfoW", "Ptr")

; Hotkeys are "WIN+F1" and "WIN+F2"

#F1::DllCall( SPIProc, Int, 0x71, Int, 0, UInt, 13, Int, 0) ; Slow: Replace value after "UInt" by your desired sensitivity
#F2::DllCall( SPIProc, Int, 0x71, Int, 0, UInt, 18, Int, 0) ; Fast