Global variable does not have global scope

Question

supposedlyGlobalVariable := \"blah\"

ARoutine()
{
   localVariable := \"asdf\"
   MsgBox, The global variable value is %supposedlyGlobalVariable%.  The local variable v         


        

Answer 1

The documentation for global variables can be found here:
https://autohotkey.com/docs/Functions.htm#Global

Global variables

To refer to an existing global variable inside a function (or create a new one), declare the variable as global prior to using it. For example:

LogToFile(TextToLog)
{
    global LogFileName
    FileAppend, %TextToLog%`n, %LogFileName%
}

I believe the concept of global, with AHK, is a bit different than in other languages. With AHK you can create a variable and use it within multiple hotkeys, and subroutines, without declaring it as global.

Gv := 0

f1::SetTimer, Action, % (on:=!on) ? (1000) : ("Off")

Action:
    Gv++
    trayTip,, % Gv
Return

f2::Msgbox, % Gv

Explaination of code:

• The F1 key toggles a timer to run the subroutine: Action every 1000ms.
• % starts an expression.
• on:=!on reverses the binary value of variable on every time F1 is pressed.
• ?: together is called the ternary operator.
• When on=1 delay is set to 1000ms; when on=0 the timer is turned Off.

The ++ operator adds 1 to variable Gv.