Question

如何在linux中用QTcreator 调用本地摄像头

Answer 1

/* 打开设备并进行错误检查 */int fd = open ("/dev/video",O_RDONLY);
if (fd==-1){
perror ("Can't open device");
return -1;
}

/* 查询设备的输出格式 */
struct v4l2_format format;
memset (&format,0,sizoef(format));
format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (-1==ioctl(fd,VIDIOC_G_FMT,&format)){
perror ("While getting format");
return -2;