How to differentiate between a line and polyline in AutoLISP?

[Anonymous]

I give up...just how does AutoLISP differentiate between lines and polylines?  I'm trying to write some LISPS that place lines and polylines on differing layers, depending on their lengths, number of vertices, etc...

I can manipulate polylines just fine, but the lines will not cooperate at all.  It is crucial that I can distinguish between the two entities, as this is the gateway to a much larger set of projects.  

Please see the attached files, it's pretty simple what I'm trying to do, if someone could help me get the lines to cooperate I'd be very grateful.  Thanks in advance for any help!

[Ranjit_Singh · Accepted solution]

Your line test is checking for "Line". It should be "AcDbLine". Try the attached.

[Shneuph]

It looks like you're very close.. only a Line is ObjectName (RO) = "AcDbLine" and polyline is ObjectName (RO) = "AcDbPolyline".  Also, ObjectName (RO) = "AcDb3dPolyline" for 3D polylines.  Use vlax-dump-object function to inspect properties.

[Anonymous]

Thank you both for the help!  I guess I had the "Line" and "AcDbLine" positions mixed-up in my way of thinking.