AutoIt .NET with C++/CLI Wrapper

[Eltion 0]

Hi, 

I have a managed class dll from c#. Using this guide here https://www.codeproject.com/articles/556582/usingplusc-plusfromplusnativeplusc-b-bpluswith I was able to create a wrapper around my  managed library with  C++/CLI. Then created a unmanaged c++ library using that. I've tested it in a console application and everything works fine, but when I try to access the unmanaged c++ library using DllCall it does not work.

 

#C sharp
public class MathTest
{
    public int add(int x, int y) {
        return x + y;
    }
}

 

#Wrapper

#include "pch.h"

#using "TEST3.dll"

#include <msclr\auto_gcroot.h>

#include "Wrapper.h"


using namespace System::Runtime::InteropServices;

class MathTestWrapperPrivate
{
public: msclr::auto_gcroot<MathTest^> MathTest;
};

MathTestWrapper::MathTestWrapper() {
    _private = new MathTestWrapperPrivate();
    _private->MathTest = gcnew MathTest();
}

int MathTestWrapper::add(int a, int b) {
    return _private->MathTest->add(a, b);
}

#Unmanaged dll

#include "pch.h"
#include "testdll.h"
#include "Wrapper.h"

int add(int a, int b) {
    MathTestWrapper w;
    return w.add(a, b);
}

#testdll.h


#pragma once
#ifdef TESTDLL_EXPORTS
#define TESTDLL __declspec(dllexport)
#else
#define TESTDLL __declspec(dllimport)
#endif

extern "C" TESTDLL int add(int a, int b);

 

[TheXman 405]

3 hours ago, Eltion said:

when I try to access the unmanaged c++ library using DllCall it does not work.

Where is your AutoIt script with the DllCall that "does not work"?

Edited November 24, 2020 by TheXman

[boom221 2]

Did you forget to add the ":cdecl" after the return type?

[Eltion 0]

7 hours ago, TheXman said:

Where is your AutoIt script with the DllCall that "does not work"?

$a = DllOpen("testdll.dll")
$c = DllCall($a, "int:cdecl", "add","int",5,"int",5)
MsgBox(0,"",@error)

It never goes to the MsgBox so I don't see the @error at all

[water 2,391]

I suggest to check the returncode of DllOpen as well.

[Eltion 0]

6 minutes ago, water said:

I suggest to check the returncode of DllOpen as well.

DllOpen returns 1.

[water 2,391]

Looks good.

[TheXman 405]

Is your testdll.dll a 32-bit or 64-bit DLL?

In AutoIt, are you running your script as 32-bit or 64-bit?