extern "C" int _declspec(dllexport)testunity(); extern "C" int _declspec(dllexport)addT(int a,int b);int testunity() { return 3;/*这是函数，里面可以写你想要实现的任何功能 */}int addT(int a,int b){
   return a*2+b*3;}

set PATH=C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin;C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE;set INCLUDE=C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\;C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Include\;set LIB=C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\lib\;C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Lib\;C:\Program Files (x86)\Windows Kits\8.0\Lib\win8\um\x86\;cl /c Test.cpplink /dll Test.objpause

 

 

然后编译、组建。就生成了testunity.dll文件。然后再把这个文件放在你的unity工程的assert的Plugins（如果没有这个文件，那你就要新建）。

然后在unity里面新建C#脚本文件dlltest。代码如下

using UnityEngine;using System.Collections;using System.Runtime.InteropServices;public class main : MonoBehaviour {    [DllImport("uDlltest")]    private static extern int testunity();    [DllImport("uDlltest")]    private static extern int addT(int a,int b); // Use this for initialization void Start () {        print(testunity().ToString() + "," + addT(2,3).ToString()); }  // Update is called once per frame void Update () {  }}