int main(int argc, char** argv)

1、 argc与argv的默认值（argv相当于数组，尺寸由argc控制）

argc默认为1，因此argv的默认是argv[0]—指向程序运行时的全路径名

#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/features2d/features2d.hpp>
#include <opencv2/highgui/highgui.hpp>using namespace std;
using namespace cv;int main(int argc, char** argv)
{cout << "argv[0]=" << argv[0] << endl;cout << "argc=" << argc << endl;return 0;
}

2、让argv/argv的值指向特定路径

右击项目—>属性—>配置属性—>调试—>命令参数，在命令参数中输入，每个参数之间用空格隔开。

#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/features2d/features2d.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <stdio.h>
#include <stdlib.h>
using namespace std;
using namespace cv;int main(int argc, char** argv)
{for (int i = 0; i < argc; i++){cout << "argv[" << i << "] = " << argv[i] << endl;}cout << "argc=" << argc << endl;Mat img1 = imread(argv[1], 1);imshow("argv[1]", img1);Mat img2 = imread(argv[2], 1);imshow("argv[2]", img2);waitKey(0);return 0;
}