Lisp - spline measurement

I'm looking for a lisp program or tips on how to write such a program solving the following problem: I need to measure a spline ( or polyline ) in a manner the measure command do, but I would like to put block along that line(spline) with different distances from each other. For example the first block 17.001 units from the beginning of the spline(along that spline) then the second 25.253 units from the first one and so on. Thanx in advance. Mario.

 

[tigrek]

Maybe you could define the steps requested on the command line, like:
Select a pline or spline:
Select point for first block/enter distance from line start:
etc.
And whether a preexisting block with attributes is to be inserted or something else is meant by block.