[Mono-dev] File not found error when using Activator.CreateInstanceFrom()

[mike]

Ok, rewrote to use p/Invoke with a true native DLL (extern C, no name
mangling here, Jon) and it appears that I am back to *square one* with the
'File not found exception'.

If I p/Invoke to a single native dll, all is fine. However if that dll
depends on a secondary native dll, I get an "unhandled exception:
System.DLLNotFoundException". Again, this scenario works fine under .NET,
fails under 2.8

The issue seems to be related to p/Invoking a dynamic link library which
depends on a second native dll.

Here is a tiny example of all codes involved which may help highlight the
issue. Note the native dlls are in a sub-folder 'native' to the driver's
executing app path.
--------------------------------------------------------------------------
First DLL (Test_Native.dll) source :
//------------
// MyLib.h
//------------
#pragma once

extern "C" {
_declspec(dllexport) void Test();
}
//----------
//MyLib.cpp
//----------
#include <iostream>
#include <stdio.h>
#include <exception>
#include "MyLib.h"
#include "MyEnviron.h"

using namespace std;

	void Test()
	{
		foo();
		printf("ok.");
	}


Second DLL (Environ.dll) Source:
//-------------------
//MyEnviron.h
//-------------------
extern "C" { __declspec(dllexport) void foo(); }

//-------------------
//MyEnviron.cpp
//-------------------
#include <iostream>
#include <stdio.h>
#include <exception>
#include "MyEnviron.h"

using namespace std;
void foo()
{
	printf("dyn ok.");
}


// Test C# driver
//
//------------------
using System;
using System.Runtime.InteropServices;
using System.IO;
	
namespace PInvoke_Test
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			_Test();
		}			
		// Test Method
		[DllImport("Native\\Test_Native.dll",
		EntryPoint = "Test",
		ExactSpelling = false,
		CallingConvention = CallingConvention.StdCall)]
		static extern void _Test();		
	}
}
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