How to get the arclen between two curve points in Maya? -

in maya 2015, can arclen of curve using command:

cmds.arclen('bezier1') 

but want arclen of 2 points in curve. there anyway this?

using maya's api surely best way @scottiedoo said, here function made when didn't know api , gives same results.

from maya import cmds  def computecrvlength(crv, startparam = none, endparam = none):     '''     compute length of curve between 2 given uparameters. if both     uparameters arguments set none (default), compute length of     whole curve.      arguments:     - crv = string; existing nurbcurve     - startparam = 0 <= float <= 1 or none; default = none; point parameter       value, if not none, compute points between startpt ,       endpt values.     - endparam = 0 <= float <= 1 or none; default = none; point parameter       value, if not none, compute points between startpt ,       endpt values.      returns:     - length of curve between given uparameters     - length of curve start startparam     - length of curve start endparam     '''      ###### exceptions     if cmds.objexists(crv) == false:         cmds.error ('the curve "%s" does\'nt exists.' % crv)      if cmds.filterexpand (crv, sm = 9) == none:         cmds.error ('the object "%s" not nurbcurve.' % crv)      if startparam != none:         if (0 <= startparam <= 1) == false:             cmds.error ('the start point parameter value must between 0 , 1.')      if endparam != none:         if (0 <= endparam <= 1) == false:             cmds.error ('the end point parameter value must between 0 , 1.')      if (startparam == none , endparam != none) or (startparam != none , endparam == none):         cmds.error ('the start , end points parameters must both none or ' +                      'both have values.')      if startparam != none , endparam != none:         if endparam < startparam:             cmds.error ('the end point parameter value cannot less or ' +                          'equal start point parameter value.')      ###### function     if startparam == none , endparam == none:          crvlength = cmds.arclen (crv, ch = false)         distcrvtostartparam = 0         distcrvtoendparam = crvlength      else:          tmparclendim = cmds.arclengthdimension (cmds.listrelatives(crv, s = true)[0]                                                 + '.u[0]')         cmds.setattr (cmds.listrelatives(tmparclendim, p = true)[0] +                       '.uparamvalue', startparam)         distcrvtostartparam = cmds.getattr (tmparclendim + '.al')         cmds.setattr (cmds.listrelatives(tmparclendim, p = true)[0] +                       '.uparamvalue', endparam)         distcrvtoendparam = cmds.getattr (tmparclendim + '.al')         cmds.delete (tmparclendim)         crvlength = (distcrvtoendparam - distcrvtostartparam)      return crvlength, distcrvtostartparam, distcrvtoendparam