DLL Error

[dromenox]

I will create a program and will use AutoIt to make the GUI and C++ to do some things that are not possible in AutoIt. So I was thinking of making a DLL in C++ and call it from AutoIt. 

 

I made a simple example to test DLL. Is working properly, but then the AutoIt closes and not show the return. 

 

Here are the codes:

 

DLL:

 

#include <windows.h>

extern "C" __declspec(dllexport) int MyMsg(char *tit, char *txt);

__declspec(dllexport) int MyMsg(char *tit, char *txt)
{
     MessageBoxA(NULL, txt, tit, 0);
     return 83; // test return
}

AutoIt:

$ret = DllCall ( "MyDLL.dll", "int", "MyMsg", "str", "test_title", "str", "test_msg")
ConsoleWrite($ret[0]) ; 83

Edited September 5, 2014 by dromenox

[JohnOne]

I suggest you read the help file regarding DllCall, specifically about the calling method/convention.

[dromenox]

I suggest you read the help file regarding DllCall, specifically about the calling method/convention.

I based on it

Edited September 5, 2014 by dromenox

[jchd]

The keyword here is "cdecl"...

[dromenox]

Dont worked

[JohnOne]

what don't worked?

[dromenox]

The app crash and dont show the return

[jchd]

Show the crashing code.

[dromenox]

3221225477

[JohnOne]

Access Violation.

Have you ever created and successfully called a dll function from AutoIt?

[dromenox]

Access Violation.

Have you ever created and successfully called a dll function from AutoIt?

No, it's the first time. The function is being called. The only problem is that after the AutoIt closes.

[JohnOne]

AutoIt can close for many reasons, I suspect your problem here is your Dll code, not your AutoIt code.

[trancexx]

...So, it's this:

$ret = DllCall ("MyDLL.dll", "int:cdecl", "MyMsg", "str", "test_title", "str", "test_msg")

 

[dromenox]

 

...So, it's this:

$ret = DllCall ("MyDLL.dll", "int:cdecl", "MyMsg", "str", "test_title", "str", "test_msg")

Perfect!

[JohnOne]

Woah, woah!

I suggest you read the help file regarding DllCall, specifically about the calling method/convention.

 

The keyword here is "cdecl"...

 

Dont worked

What about that then?

[trancexx]

Perfect!

Both others said exactly what to do, I only draw it for you.

[dromenox]

Woah, woah!

 

What about that then?

 

I had put it in the DLL But thanks !

Do not know if it's possible to do, but I want to create a program in AutoIt that serves as a GUI to make hooks into other programs. For example, I would select an open process in my program and when this process run a particular function, like printf, in addition to performing the function normally a function of my program would be called with the parameters of the original function. 

 

It would be perfect if this code worked properly since it would only use AutoIt. 

 

 

But as is not working, I wanted to create a DLL in C ++ to the hook. Then I inject a DLL in process with AutoIt. This DLL would be in an infinite loop within the process. When the DLL detect the hook would call a function within my AutoIt program. 

 

I can do this? 

 

I had put it in the DLL