dll导入

1、纯函数导入

定义CPP：
　　BOOL EXPORT FUN(LPCTSTR lpszSrc, LPCTSTR lpszDst)
导入CPP：
　　声明：BOOL __declspec(dllimport) FUN(LPCTSTR lpszSrc, LPCTSTR lpszDst);

 二、C#导入C++的DLL

namespace ConsoleApplication1
{
    class CppDll
    {
        [DllImport("MyDLLFun.dll", EntryPoint = "Add", CallingConvention = CallingConvention.Cdecl)]
        public static extern int Add(int x, int y);
    }
    class Program
    {
        static void Main(string[] args)
        {
            int a = CppDll.Add(1, 2);
            Console.WriteLine(a);
        }
    }
}