Parametric Values - Controling with LISP

[RockyBrown4134]

Is there a way to get the value of a Parametric Parameter and controling with LISP?

If so, do you have any sample code you can share?

Thanks.

[wayne.brill]

Hi Rocky,

Can you explain more about what you need?

If you are talking about controlling constraints then you could use the AutoCAD .NET API. There is not any AutoLISP support for this. Maybe using .Net and AutoLISP together could be a solution.   

[RockyBrown4134]

Example: In a drawing I have a block with a raint parameter controling the length.

I have a parameter called "OVL" for overall length. Let's say this is the distance between two supports.

I have a contraint parameter called "Length".  Length = OVL - thicknes1 - thickness2, where,

                                                                                                  for now, thicknes1 and thickness2 are constant.

Inside the drawing, i want to run a LISP command (macro, etc) and key in the overall length (OVL).

This allows the block to update acordingly, based on the formula above.

Note: this may not be the the only constraint parameter, or parameter. It could be more.

Right now, I have this block with a dynamic strecth and working the way I intended. But I want to eliminate the "manual" concept and make it "automated".

I have another post http://forums.autodesk.com/t5/Visual-LISP-AutoLISP-and-General/Dynamic-Block-Accessing-Action-Parame... looking at it from a Dynamic Block perspective.

I'm Old school and LISP is what I know, enough to get me in trouble. .Net I have never explored.

"Maybe using .Net and AutoLISP together could be a solution." - What would be a learning curve? Any Tutorials / articles / documentation available?

[DRossger]

Hi!

It enough possible with ActiveX take a Look here /Dirk

[RockyBrown4134]

Back from vacation, Thanks. I'll give this a look.

[RockyBrown4134]

Good post. If the code flows like I think it does, it seems to be simple enough. But I don't know if I truly understand everything, yet. I have some questions that I would like to ask.

I saw the comment made about Activex, that I would like to know more about:

"It's using ActiveX instead of entget & entmod. That's because dynamic block properties are only accessible through ActiveX in AutoLisp."

I never got into ActiveX, so please understand where I'm coming from. Being "old school", it was easier to achieve the tasks through LISP. Are there any articles / tutorials for the "beginer", especially for an "old dog who wants to learn a new trick"?

Does ActiveX have anything to do with the VBA Application being loaded or not loaded? (I never got into VBA either, only enough to screw things up.)

Just for adding to the conversation........I read in another response above (Wayne Brill), that .NET was another way to possibly go.  With that said, what would be easier to learn, ActiveX or .Net?

Is it just a "Preferance thing"?

Mr. Brill, I would like your input also.

Thanks