opencv拍照保存代码

#include <opencv2\opencv.hpp>
using namespace cv;

int main()
{

    VideoCapture cap(1);    //打开摄像头
    Mat frame;

    int i = 1;
    while (1)
    {
        String filename = format("photo%d.jpg", i);
        char key = waitKey(100);
        cap >> frame;
        imshow("frame", frame);

        switch (key)
        {
        case'p':
            i++;
            imwrite(filename, frame);
            imshow("photo", frame);
            waitKey(500);
            destroyWindow("photo");
            break;
        default:
            break;
        }
    }

}