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人数变化参数结构体。
struct{
NET_VCA_POLYGON struRegion;
BYTE bySensitivity;
BYTE byPeopleNumThreshold;
BYTE byDetectMode;
BYTE byNoneStateEffective;
WORD wDuration;
BYTE byRes[2];
}NET_VCA_PEOPLENUM_CHANGE, *LPNET_VCA_PEOPLENUM_CHANGE;