I posted a question regarding this previously, but the suggestions didn't help, so I'm trying again.

I'll include more code this time.

I have existing unmanaged C++ code. There is a class that I am using. I can access it via COM. For methods that just take primative data types everything works find.For methods of the class that take arrays things don't work so well because the C# code that is generated expects a ref to a single value, not an array.

The problem is that the generated C# code only wants a reference, not an actual array.

This is what I am doing:
1. build the C++ class in one solution
2. goto my C# solution, reference the C++ dll, and make it isolated COM reference
3 instantiate the COM class
4. try and pass an array to a method

#4 fails because I need to pass an array, but on a ref

Below is some of the code.

Any help would be awesome,
thanks

########################################################################
// ComDomo.h
[
object,
uuid("2158751B-896E-461d-9012-EF1680BE0628"),
dual,
helpstring("IMath Interface")
]
__interface IDemo : IDispatch
{
[id(1)] HRESULT Add([in] LONG val1, [in] LONG val2, [out, retval] LONG* result);
[id(2), helpstring("method Writer")] HRESULT Writer([in, size_is(len)] int* pData, [in] int len);
};

[
coclass,
threading(apartment),
version(1.0),
uuid("0CB36265-44F8-47E4-9CAD-FFFBCB0C7B71"),
helpstring("ComDemo Class")
]
class ATL_NO_VTABLE ComDemo : public IDemo
{
public:
ComDemo(){ }

DECLARE_PROTECT_FINAL_CONSTRUCT()

HRESULT FinalConstruct()
{
return S_OK;
}

void FinalRelease() { }

public:
STDMETHOD(Writer)(int stuff[], int len);
STDMETHOD(Add)(LONG val1, LONG val2, LONG* result);
};
########################################################################

########################################################################
//ComDemo.cpp
#include "stdafx.h"
#include "ComDemo.h"
#include <iostream>

using namespace std;

STDMETHODIMP ComDemo::Writer(int* stuff, int len)
{
std::cout << "ComDemo::Writer(int* stuff, int len)" << std::endl;

for(int i=0; i<len; i++)
std::cout << "input was " << stuff << std::endl;

return S_OK;
}

STDMETHODIMP ComDemo::Add(LONG val1, LONG val2, LONG* result)
{
*result = val1 + val2;
return S_OK;
}
########################################################################

########################################################################
// a C# snippet from the project that calls this:

using System;
using System.Runtime.InteropServices;

namespace csharp_calls_com
{
class Program
{
static void Main(string[] args)
{
int[] arrayOfInts = new int[]{10,9,8,7,6};

ComServer.ComDemo cd = new ComServer.ComDemo();

//
// THIS IS WHAT IS ONLY TAKING A REF, NOT AN ARRAY
//
cd.Writer(ref arrayOfInts[0], arrayOfInts.Length);

Console.ReadKey();
}
}
}
########################################################################