C#怎么调用C++的dll，dll函数的输入类型是Mat（或者是const char*）

pixian0237 2017-04-08 05:08:48

现在我用C#调用dll出现了问题，当我把dll函数的输入类型改为const char*的时候，出现的问题就是

其中我的C#程序如下



using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Threading;

using System.Runtime.InteropServices;

using System.IO;

namespace WindowsFormsApplication3

{

    public partial class Form1 : Form

    {

        [DllImport("smallT_BJ.dll", EntryPoint = "?smallTarget@@YA?AV?$Point_@H@cv@@PBD@Z")]

       public static extern Point smallTarget(string path);

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            string path =" C:\\1.bmp";

            Point point = new Point();

            point = smallTarget(path);

        }

    }

}

C++的h文件的内容如下



#include <windows.h>

#include <iostream>

#include <vector>

#include <numeric>

#include <algorithm>

#include <opencv2\opencv.hpp>

#include <fstream>

#include <memory>

#include <stdlib.h>

#include <math.h>

#include <time.h>



using namespace std;

using namespace cv;



#ifdef SMALLT_BJ_EXPORTS

#define SMALLT_BJ_API __declspec(dllexport)

#else

#define SMALLT_BJ_API __declspec(dllimport)

#endif



SMALLT_BJ_API Mat filters(Mat source, int thresholdin);



SMALLT_BJ_API Mat filterspatial2(Mat source, int th);



SMALLT_BJ_API void cmedian(Mat src, Mat dst, int innerbox_size, int outerbox_size);



SMALLT_BJ_API Mat prefilter(Mat source);



SMALLT_BJ_API vector<Mat> getSuspects(Mat& frame, Mat src, int box_size, vector<Point>& LeftUpPoints, vector<vector<Point>>& cont);



SMALLT_BJ_API Point smallTarget(const char* file);