linux截屏程序

利用opencv从frambuffer读取桌面图片,实现截屏,并保存为png32格式图片.

//// Created by czh on 18-9-3.//#include <unistd.h>#include <unistd.h>#include <opencv2/opencv.hpp>#include <vector>int main(){unsigned char buf[1280 * 480 * 4];int fb;fb = open("/dev/fb0", O_RDONLY);if(fb < 0)exit(1);printf("reading screen...\n");read(fb, buf, 1280 * 480 * 4);close(fb);printf("saving screen...\n");std::vector<int> params;params.push_back(CV_IMWRITE_PNG_COMPRESSION);params.push_back(0);cv::Mat BGRA(480, 1280, CV_8UC4);BGRA.data = buf;imwrite("./screen.png", BGRA, params);return 0;}