Hello,everyone.I am now having some poblem with the Api function GetBCurveParams,I want to extract the  params of a spline after I have sktched in Solidworks before.Because the skecth is drawed by myself,so I know the coordinates of the spline's control points.However，I have test the api GetBCurveParams(false/true),GetBCurveParams3(true,false/true,false/true),GetBCurveParams4(true,false,false,false)to get the control points and knot vector in cubic curve ,none of them can accurately does well.For  eample,I drew the spline with 9 control points ,by SplineArray4 = swCurve.GetBCurveParams4(true, false, true, false);I get the array which gives back me 6 control points ,or the knot vector only consists of 0 and 1.I am really puzzled.Can someone give me some hints,thank you