Howto implement callback interface from unmanaged DLL to .net app?

Question

in my next project I want to implement a GUI for already existing code in C++. My plan is to wrap the C++ part in a DLL and to implement the GUI in C#. My problem is that I

Answer 1

See Marshal.GetFunctionPointerForDelegate, which will give you a function pointer for calling managed (i.e. C# code) from unmanaged code.