C#调用C++的dll两种实现方式(托管与非托管)

#include <cv.h>
#include <highgui.h>
extern "C" _ _declspec(dllexport)void Show()  
{  
	IplImage *img = cvLoadImage("E:\\图库\\abc.jpg");
	cvNamedWindow("Image:",1);
	cvShowImage("Image:",img);
	cvWaitKey();
	cvDestroyWindow("Image:");
	cvReleaseImage(&img);
	return ;
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;   //必须添加，不然DllImport报错
namespace dllConsoleApplication1
{
    class CPPDLL
    {
        [DllImport("MyDLL.dll", CharSet =CharSet.Ansi)] //引入dll，并设置字符集
		//[DllImport("MyDLL.dll")] //可以替代上一句代码
        public static extern int Show();
    }
    class Program
    {
        static void Main(string[] args)
        {
            CPPDLL.Show();
            Console.ReadLine();
        }
    }
}

void show();

#include "Functions.h"
#include <opencv2/opencv.hpp>
using namespace cv;
void show()
{
	Mat img = imread("E:\\图库\\abc.jpg");
	imshow("src",img);
	waitKey(0);
}

#pragma once
public ref class clrClass
{
public:
	clrClass(void);
	~clrClass(void);
	int member;//自添加
	void showImage();//自添加
};

#include "clrClass.h"
#include "Functions.h"//自添加
clrClass::clrClass(void)
{
}
clrClass::~clrClass(void)
{
}
void clrClass::showImage()//自添加
{
	show();
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Test_托管DLL
{
    class Program
    {
        static void Main(string[] args)
        {
            clrClass ClrCLass =new clrClass();
            ClrCLass.showImage();
        }
    }
}