I believe it's in how you're creating your array. By putting percent signs around your array indexes, you're actually saying that you want to use the first file-level input parameter (in the case of using %1%). This is most likely blank, so what it ends up looking for is a variable named "window_title_array"
Take out the percents. You should use this:
window_title_array1 = 3270 Display A - A
window_title_array2 = 3270 Display A - B
window_title_array3 = 3270 Display A - C
window_title_array4 = 3270 Display A - D
window_title_array5 = 3270 Display A - E
window_title_array6 = 3270 Display A - F
And not this:
window_title_array%1% = 3270 Display A - A
window_title_array%2% = 3270 Display A - B
window_title_array%3% = 3270 Display A - C
window_title_array%4% = 3270 Display A - D
window_title_array%5% = 3270 Display A - E
window_title_array%6% = 3270 Display A - F
And then if you want to reference something with a counter variable, ... (looking at your code)... you would do it exactly like you are.
And note that this is not a native array in AHK. But if you have an older version you may not be able to use native arrays. This is how arrays were done for a long time in AHK.
Furthermore, another way I deal with this is by creating a "built-in" counter/length variable and use that to dynamically number my arrays. Then that can easily be referenced in array loops etc. And notice no hand-coding of array indexes, which means you can add more or insert them without having to renumber anything. I'm often doing arrays of structures, and below is a simple example...
myArr0 = 0 ; At the end, this will hold the count of the array
myArr0++
myArr%myArr0%_firstName = John
myArr%myArr0%_lastName = Smith
myArr0++
myArr%myArr0%_firstName = Bill
myArr%myArr0%_lastName = Jones
myNames =
; assemble a list of names, a simple example
loop, %myArr0%
{
myNames := myNames . myArr%a_index%_firstName . ", "
}
And I use the <array name>0 syntax for the counter because that's the same syntax as outputted by the stringsplit command.
