my experience on dll

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 :

Code (csharp):

1.  
2. using System;
3. using System.Collections.Generic;
4. //using System.Linq;
5. using System.Text;
6.  
7. namespace ClassLibrary1
8. {
9.     public class Class1
10.     {
11.         public static int Add(int i, int j)
12.         {
13.             return (i + j)*1000;
14.         }
15.     }
16. }
17.  

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

Code (csharp):

1.  
2. #pragma strict
3.  
4. function Start () {
5.     print(ClassLibrary1.Class1.Add(3, 4));
6. }
7.  
8. function Update () {
9.  
10. }
11.  

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 "

 

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

 

and this is it's C# code for unity:

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4. using System.Runtime.InteropServices;
5.  
6. public class NewBehaviourScript : MonoBehaviour {
7.      [DllImport ("ClassLibrary1")]
8.     private static extern int Add(int i, int j);
9.    
10.     void Start () {
11.         print ("from c#"+ ClassLibrary1.Class1.Add (3,2));
12.     }
13.     void Update () {
14.    
15.     }
16. }
17.  
18.  

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

 

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

 

my delphi dll code:

Code (csharp):

1.  
2. library Project1;
3. uses
4.   SysUtils, Classes;
5.  
6. {$R *.res}
7. function AddIntegers(_a, _b: integer): integer;stdcall;
8. begin
9.   Result := _a + _b;
10. end;
11.  
12. exports
13.    AddIntegers;
14. begin
15.  
16. end.
17.  

my js code:

Code (csharp):

1.  
2. #pragma strict
3.  
4. function Start () {
5.     var a:int;
6.     a= Project1.AddIntegers(3,33);
7.     print(a);
8. }
9.  
10. function Update () {
11.  
12. }
13.  

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

 

using dll function by creating it's class instance:

http://answers.unity3d.com/questions/194811/unity-plugins-for-dll.html

 

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: