Call a C# method/function from a C++ DLL (which is loaded from C# with “Dllimport”)

Question

It\'s a little hard to resume it in a single title, so here my situation.

I\'m building a C# application that loads a C++ library.
I call functions from that C++ DLL

Answer 1

The Unmanaged Exports project might help you with this:
https://sites.google.com/site/robertgiesecke/Home/uploads/unmanagedexports

Basically it allows you to export Functions from your assembly using the DllExport Attribute. Those functions can then be used like normal native Dll exports. It's something like the missing counterpart of the DllImport attribute.

You would then declare your method like this:

[DllExport("myCSharpFunction")]
static public void myCSharpFunction()
{
    MessageBox.Show("Called from C++ code !!");
}

But also such a two-way dependency would usually look suspicious to me. Maybe it is also possible in your case to use callbacks, like ken suggested.