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I am currently trying to call a function from a C# DLL from an unmanaged C++ app. After searching for hours on the web and SO, I found I have a few options. I can use COM, DllExport , or use reverse PInvoke with delegates. The last sounded most appealing to me, so after searching SO I ended up here . It states that the article shows how to use reverse PInvoke, but it looks like the C# code has to first import the C++ Dll, before it can be used. I need to be able to use C++ to call my C# Dll functions, without running a C# app first. Maybe reverse PInvoke isn't the way to do it, but I am quite inexperienced when it comes to low level stuff, so any pointers or tips on how to do this would be great. The code in the link is C# using System.Runtime.InteropServices; public class foo { public delegate void callback(string str); public static void callee(string str) { System.Console.WriteLine("Managed: " +str); } public static int Main() { caller("Hello World!", 10, new callback(foo.callee)); return 0; } [DllImport("nat.dll",CallingConvention=CallingConvention.StdCall)] public static extern void caller(string str, int count, callback call); } C++ #include <stdio.h> #include <string.h> typedef void (__stdcall *callback)(wchar_t * str); extern "C" __declspec(dllexport) void __stdcall caller(wchar_t * input, int count, callback call) { for(int i = 0; i < count; i++) { call(input); } }

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