Returns the parameter of the endpoint of the curve
(vlax-curve-getEndParam curve-obj)
Arguments
The VLA-object to be measured.
Return Values
A real number representing an end parameter, if successful; otherwise nil.
Examples
The following function call returns the end parameter of the curve:
(vlax-curve-getendparam ellipseObj) 6.28319
The end parameter is 6.28319 (twice pi).