Check if constant exists and if not create one?

[VAN0]

Hello.

I'm trying make my script be able run with stable autoit version and beta without modifying the script for each version.

Beta version is missing some constants (and wise-versa)

How do I check if a constant exists and create one if it doesn't?

This works with beta, but fails with stable:

#Region ;**** Directives created by AutoIt3Wrapper_GUI ****
;#AutoIt3Wrapper_Version=Beta
#EndRegion ;**** Directives created by AutoIt3Wrapper_GUI ****

#include <WinAPI.au3>

If Not IsDeclared("__WINVER") Then Global Const $__WINVER = "blah"
ConsoleWrite("$__WINVER: " & VarGetType($__WINVER) & @CRLF)

 

[EDIT]

So far the only work around I could come up with is to define a different constant and use Eval() to retrieve value of existing one:

#Region ;**** Directives created by AutoIt3Wrapper_GUI ****
;#AutoIt3Wrapper_Version=Beta
#EndRegion ;**** Directives created by AutoIt3Wrapper_GUI ****

#include <WinAPI.au3>

Global Const $__WINVER_NEW = IsDeclared("__WINVER") ? Eval("__WINVER") : "blah"

ConsoleWrite("$__WINVER_NEW: " & VarGetType($__WINVER_NEW) & @CRLF)

 

Edited June 21, 2020 by VAN0

[argumentum]

Edited June 21, 2020 by argumentum

[Nine]

There :

#Region ;**** Directives created by AutoIt3Wrapper_GUI ****
#AutoIt3Wrapper_Run_AU3Check=n
;#AutoIt3Wrapper_Version=Beta
#EndRegion ;**** Directives created by AutoIt3Wrapper_GUI ****

#include <WinAPI.au3>

If Not IsDeclared("__WINVER") Then Global Const $__WINVER = "blah"
ConsoleWrite("$__WINVER: " & VarGetType($__WINVER) & @CRLF)

 

[jchd]

Using _WinAPI_GetVersion() directly is simpler.

[Nine]

@jchd I think OP was giving an example of how declaring a Global Const if it already exist or not.  __WINVER was just an example, it could be any other constants.