I used VFW camera for video data display on the Panel, now want to achieve in the rectangular frame can be manually selected camera video images, similar to the face recognition and manually selected rectangular box, but because the Panel video has been refreshed, had just finished painting box was covered, and not achieve the function, I want to see a lot of bosses, borrowed a lot of code, are not achieve them, want to find a give code, reference code, such as:
https://bbs.csdn.net/topics/392349677
https://blog.csdn.net/weixin_42668972/article/details/104654564