C++ 17 遍历文件夹图片文件进行循环操作

#include <filesystem>
using namespace std;
namespace fs = std::filesystem;

		
string path = filepath; // 替换为指定目录的路径
		for (const auto& entry : fs::directory_iterator(path)) {
			if (entry.is_regular_file() && entry.path().extension() == ".jpg") {
				//std::cout << entry.path() << std::endl; // 输出jpg文件路径
				fs::path dPath = entry.path();
				string ddPath = dPath.string();
				cv::Mat m = cv::imread(ddPath, 1);
				if (m.empty())
				{
					fprintf(stderr, "cv::imread %s failed\n", imagepath);
					return -1;
				}
 
				double t1 = (double)cv::getTickCount();
				std::vector<lineMLSD> lines;
				detect_mlsd(m, lines);
				//////////draw/////////////////
				cv::Mat image = m.clone();
				for (size_t i = 0; i < lines.size(); i++)
				{
					const lineMLSD& obj = lines[i];
					fprintf(stderr, "%d %d %d x %d\n", obj.sp.x, obj.sp.y, obj.ep.x, obj.ep.y);
					cv::line(image, obj.sp, obj.ep, cv::Scalar(0, 0, 255), 2);
				}
				float fps = (double)cv::getTickFrequency() / (cv::getTickCount() - t1);
				cv::putText(image, "FPS : " + std::to_string(int(fps)), cv::Point(50, 50), cv::FONT_HERSHEY_SIMPLEX, 1.5, cv::Scalar(50, 150, 50), 4);
 
				cv::imwrite("out/" + entry.path().filename().string(), image);
			}
		}