Calling a C# function from a C++ DLL

Question

I have a DLL written in C++, and I want to pass a C# function to a function in the C++ DLL and call the C# function from C++. How would I do this? Thanks in advance, and please keep your answers simple. I don't think I'll need to post a code sample for this one, but if you need one please ask.

What does this have to do with Lua? You're just asking about calling C# from C++ code. — Nicol Bolas
– Nicol Bolas, Commented Mar 4, 2012 at 5:11

JaredPar · Accepted Answer · 2012-03-04 05:16:00Z

There are generally two ways to accomplish this: COM Interop and Reverse PInvoke. If you are passing around a lot of objects with behaviors then COM interop is likely you're best bet. Here though it sounds like you're just trying to pass a single function around. If so then Reverse PInvoke is what you want.

Here is a nice tutorial on the subject

The basic process though is fairly similar to normal PInvoke.

Define a native entry point which takes at least one function pointer
Define the native pointer as a delegate in managed code
Pass the delegate down through the entry point

It can now be invoked as a normal function pointer in native code

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