how work dll with AutoIt

[Luigi]

Hi forum!

I found this article, teaches "how create a dll" and work with AutoIt.

sorry my newbie questions

The doubt is:

1) I can store some variable in the DLL?

2) if I can save this variable, what is the life cicle? (until: scripting is running? pc power off? dll unload?)

3) the dll use in AutoIt, can be load and unload?

4) what is happend when script is closed whitout unload dll?

Regards, Luigi

[trancexx]

In layman's terms, you can "store" as much data as you want in dll. Dll uses chunk of memory space of your process, therefore maximum lifetime of some data depends on lifetime of your process. Unloading the dll frees reserved chunk and renders used memory invalid. You can unload a dll at any time, and if you don't do that AutoIt will do it for you by default before it terminates.

You can not store variable. You can store data that variable holds.

[Luigi]

 

for example, if is possible writhe this simple code inside DLL, read the var's value is not possible?

the method "sum" work fine, and return the correct operation, but, not store the var value, it is correctly?

I need save the var in other way (ini, sqlite)...

global $var

Func sum($a, $b)
   $var = $a+$b
   Return $var
EndFunc

Func read()
   return $var
EndFunc

 

[trancexx]

Of course you can do that. You can save, read, change... whatever you want.

[Luigi]

Awesome! Cool! Greate! 

Thank you trancexx! ^^

#include "Stdafx.h"

#include "teste.h"

int var;

extern "C" __declspec(dllexport) int sum(int a, int b){
    var = a + b;
    return var;
}

extern "C" __declspec(dllexport) int read(){
    return var;
}

#include-once
#include <Memory.au3>

Local $sDll = "teste.dll"
Local $TRY
Local $a = 3
Local $b = 4

Local $hDLL = DllOpen("teste.dll")
ConsoleWrite("$hDll[ " & $hDLL & " ] @error[ " & @error & " ] @extended[ " & @extended & " ]" & @LF)

$TRY = DllCall($hDll, "int:cdecl", "sum", "int", $a, "int", $b)

ConsoleWrite("$hDll[ " & $hDLL & " ] @error[ " & @error & " ] @extended[ " & @extended & " ] $TRY[ " & $TRY[0] & " ]" & @LF)

$TRY = DllCall($hDll, "int:cdecl", "read")

ConsoleWrite("$hDll[ " & $hDLL & " ] @error[ " & @error & " ] @extended[ " & @extended & " ] $TRY[ " & $TRY[0] & " ]" & @LF)

DllClose($hDLL)
ConsoleWrite("$hDll[ " & $hDLL & " ] @error[ " & @error & " ] @extended[ " & @extended & " ]" & @LF)

 

Edited July 25, 2015 by Luigi