my experience on dll

Unity Engine
1

Hi
I need to write a dll in visualstudio C# and use it in unity and after some problems finally i can do it.
because search and find get many time of me i am createing this topic to write it so you can use with less search:

at visual studio:
i made a dll project and code is :

using System;
using System.Collections.Generic;
//using System.Linq;
using System.Text;

namespace ClassLibrary1
{
    public class Class1
    {
        public static int Add(int i, int j)
        {
            return (i + j)*1000;
        }
    }
}

after build it , i copy dll to my project in asset folder and write a js code like this:

#pragma strict

function Start () {
	print(ClassLibrary1.Class1.Add(3, 4));
}

function Update () {

}

just this.no need to use [dllimport … and other thing.
and finally attach this js to an object (like empty object)

1-in VS goto project menu and go to properties (last item) and set “target frame work” to “.net framework 2.0”
2-in unity goto edit>project setting>player and in “setting for pc and mac stand alone” set “.net 2 subset” for "api compatibility level "

2

You still need to dllimport if the program is a native plugin.

3

and this is it’s C# code for unity:

using UnityEngine;
using System.Collections;
using System.Runtime.InteropServices;

public class NewBehaviourScript : MonoBehaviour {
	 [DllImport ("ClassLibrary1")]
	private static extern int Add(int i, int j);
	
	void Start () {
		print ("from c#"+ ClassLibrary1.Class1.Add (3,2));
	}
	void Update () {
	
	}
}

important note: i use " public static int" in dll but i have to use “private static extern int” in predefinition

4

i think you can’t use dllimport in js codes.
and do you expalne what’s the meaning of “native”?

5

my delphi dll code:

library Project1;
uses
  SysUtils, Classes;

{$R *.res}
function AddIntegers(_a, _b: integer): integer;stdcall;
begin
  Result := _a + _b;
end;

exports
   AddIntegers;
begin

end.

my js code:

#pragma strict

function Start () {
	var a:int;
	a= Project1.AddIntegers(3,33);
	print(a);
}

function Update () {

}

but something is wrong.
i will refresh this post if i can solve problems.

6

using dll function by creating it’s class instance:

7

I have to use a dll that made by delphi but still have problem.
i need a small code for c# or js in unity3d.
can anyone show me a sample: