[C++知识库]main函数的argc与argv

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;
}

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