How do I call methods in a C# dll from my C code?

Question

I am trying to create an integration between a 3rd party Lisp-based program (Let's call it ABC) and a C# program I have written myself (let's call it DEF). The problem is that ABC can only call assemblies created in C or Fortran. So I started learning C, and I got the "hello world" test to work, where ABC call my C dll and gets "hello world" in return. The I tried to call my DEF dll from the C code using explicit loading and GetProcAddress. It worked if I called another C dll, but not a C# dll. Now I wonder if I must learn C++ and call C# from C++ to create this nice call chain:

ABC -> C -> C++ -> DEF(C#) -> C++ -> C -> ABC

If that is the only way, can anyone help me with some examples etc?

Did you register your c# dll for COM interop? I've done it in the past, it is possible. — SouthShoreAK
– SouthShoreAK, Commented Apr 26, 2012 at 14:27
Don't forget to mark your question answered if it is (check the hook under the answer's downvote button). — sschrass
– sschrass, Commented Apr 27, 2012 at 9:24

sschrass · Accepted Answer · 2012-04-26 14:31:41Z

3

When you create a .NET assembly, you can set a checkbox to have the assembly registered for COM interop. This will allow you to access it from any language that can call COM. (C can can't it? Been a long time since I touched C or C++.)

Configuration Properties -> Build page of your project properties. Look for "Register for COM Interop".

answered Apr 26, 2012 at 14:31

sschrass

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1 Comment

AndersJH Over a year ago

This did not work. C still cannot find the procedure address in the dll.

SLaks · Accepted Answer · 2012-04-26 14:29:19Z

2

Use this project to export C# functions as native entry points.

answered Apr 26, 2012 at 14:29

SLaks

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