AutoHotkey Community

[Payam]

Ok, this might be an already talked about limitation or I'm missing the correct way to do this.

itemtitle1 & itemtitle2 are variables.

Now, if in a loop I do this:

num=0 ;initialize

Loop,2
{
num++
title=%itemtitle%num%% ; <=== here is the problem
GoSub,gettitlecost
MsgBox, Cost of itemtitle%num% = %cost%
}


I get an AHK error:
---------------------------
determine_cost.ahk
---------------------------
Error at line 228.

Line Text: %itemtitle%num%%
Error: This parmeter contains an empty variable reference (%%).

The program will exit.
---------------------------
OK
---------------------------

Whats the workaround? Thanks as always.

[BoBo]

title=%itemtitle%num%%

title=%itemtitle%%num%

Maybe you should have a look at this.

[Chris]

In case it's of use: To create a literal percent sign, precede it with the escape character: `%

[Ethan]

Unless I'm mistaken what you're trying to do is use an array of items?

I made this same mistake when first trying to use an array. The problem comes from the fact that AHK doesn't parse such nested dereference characters since they're nondirectional (no open and close, it's just one character).

The solution seems to be to use a function that accepts an OutputVar (variable), such as StringTrimLeft, but actually does nothing. In other words for you it would be:

[Ethan]

Oh, and BTW, you don't need a separate num variable for the loop, since AHK contains the built in A_Index which contains the current loop iteration (indexing from 1).

[Chris]