Create an instance of object from interface from C# DLL

[Archibal]

I am trying to run a function from a DLL file. That function is embedded in a series of interfaces. No classes. I can't run it in my C++/CLI. I am getting an unhandled exception.

This is how my code looks like.

/ main project file.

#include "stdafx.h"

using namespace System;
using namespace AGP::Tools;

int main(array<System::String ^> ^args)
{
           ITools ^tools = ToolsFactory::Load(0);
	   ITools3 ^engine = tools->Tools2->Engine;
           engine->Run(1); // Run is a function

	   Console::WriteLine("\nOK");
       
           ToolsFactory::Unload(0);

          Console::WriteLine(L"Press any key to continue . . .");
          return 0;
}

I am getting a error message like this:

unhandled exception: systemNullReferenceException: Object reference not set to an instance of an object at
AGP.Tools.Engine.Run(int 32)

[modoran]

That DLL is a COM server ? If so, request a interface pointer via CoCreateInstance() API.