How do I marshal a structure as a pointer to a structure?

Question

I am trying to pass a structure from C# into C++ library. I pass structure as an object, and C++ function expects it as a pointer (void *).

I am having problem pas

Answer 1

Try passing the structure as a ref parameter.

[DllImport("MockVadavLib.dll", CharSet = CharSet.Ansi)]
public static extern IntPtr TheFunction(ref UserRec userRec);

When you use a ref combined with a structure, it conceptually passes the address.