Polygon information structure.
struct{
DWORD dwPointNum;
NET_VCA_POINT struPos[ITC_MAX_POLYGON_POINT_NUM/*20*/];
}NET_ITC_POLYGON,*LPNET_ITC_POLYGON;
Number of valid points, which should be larger than and equal to 3, if three points are on a straight line, or the lines crossed, it indicates the invalid region.
Polygon boundary points, the maximum number is 20, refer to the structure NET_VCA_POINT for details.