说明：   此源码的规模较小，所以更合适初学者学习，但请不要用来 做违法的事，本人只是提供了供大家学习的资源，使用者的一切 后果均与本人无关！若谁用videocap 控件能进行视频监控的话， 不妨发一份源码给我，
(This source smaller, so more suitable for beginners to learn, but please do not used to do illegal things, I only provided the resources for everyone to learn, users all the consequences and I have nothing to do! If videocap controls who can use video surveillance, then, may wish to send a source to me,)