Structure about blackboard writing detection parameters.
struct{ NET_VCA_POLYGON struRegion; BYTE byTeacherState; BYTE byWritingState; BYTE byWritingArea; BYTE byRes[5]; }NET_VCA_BLACKBOARD_WRITE,*LPNET_VCA_BLACKBOARD_WRITE;
Coordinates of detection area, refer to the structure NET_VCA_POLYGON for details.
Teacher status (it is valid when uploading alarm): 0-close-up, 1-panorama, 2-no teacher
Blackboard writing status (it is valid when uploading alarm): 0-started, 1-ended
Blackboard writing region (it is valid when uploading alarm): 0-whole blackboard, 1-left part of blackboard, 2-right part of blackboard.
Reserved, set to 0.