How to import a c++ custom class into c# unity

Question

I have a DLL file that contains a class that I want to use inside of my c# script in a unity project.

I recently searched about dlls and learned to create dlls and use them inside c#

this is the way i use the dll import attribute to import a method from a dll and use it inside of c#

private const string dll= "MyDllFile";

DllImport(Dll, CallingConvention = CallingConvention.Cdecl)]
static extern float percent(float percent, float of);

The main dll file that i want to work on has a custom class called Factory and i want to make an instance of that class which is inside of a dll file in my c# script.

since i don't have the factory class in my c# project, i can not write something like

DllImport(Dll, CallingConvention = CallingConvention.Cdecl)]
private static extern factory(string name);

Factory factory = Factory("myFactory");

This won't work because Factory class is a custom class.

the factory() in the dll file, returns an instance of Factory class.

Any help would be appreciated.

Create your own class with the call to dll inside your class. — jdweng, Dec 14 '20 at 18:41
you'll need to wrap your `Factory` class into a set of c functions, SWIG might be helpful — Alan Birtles, Dec 14 '20 at 18:45
public class MyClass { float p = 12.0; float of = 23.4; float f = percent(percent, of);} — jdweng, Dec 14 '20 at 21:00
@jdweng oh, well, that's not my question, i guess you didn't read it completely :D — Amirreza Yegane, Dec 15 '20 at 12:12
I did. I said you need to put the c++ call into its own instance of a class. — jdweng, Dec 15 '20 at 12:26
@jdweng you showed me a good example with a float as the value type for the c++ call. the function I'm trying to call has an unknown type, i mean, a custom class. what can i put as a type for that? `public class MyClass { float p = 12.0; float of = 23.4; whatTypeInHere f = percent(percent, of);` — Amirreza Yegane, Dec 15 '20 at 12:30
@jdweng well, i said, my dll has a function called Factory() that returns a custom class and i didn't mention how many parameters or fields it has. as i mentioned, percent() is a test function that i created to test some codes. the main dll that im trying to import has a complex function called Factory(). — Amirreza Yegane, Dec 15 '20 at 12:40

How to import a c++ custom class into c# unity

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