Reviewing the documentation (and samples) for IADSketchBspline.GetBsplineData, it appears that the only spline support is for control-node based spline entry.
Is there any way to enter points in the "Interpolated Points" mode the way the user interfaces permits? Or to retrieve the spline...
DA API Bugs: IADSketchFigures.AddBspline
Documentation shows prototype of AddBspline function as:
Function AddBspline(ByVal order As Integer, ByVal numCtlPoints As Integer, ByRef pCtlPoints() As Double, ByRef pKnotVector() As Double, ByRef pWeights() As Double) As...