public extern static bool NET_DVR_PTZSelZoomIn(int lRealHandle, ref NET_DVR_POINT_FRAME pStruPointFrame);
public static extern bool NET_DVR_PTZSelZoomIn_EX(int lUserID, int lChannel, NET_DVR_POINT_FRAME pStruPointFrame);
public static extern bool NET_DVR_PTZSelZoomIn(int lRealHandle, NET_DVR_POINT_FRAME pStruPointFrame);