BURST command in lisp

[davidEPN6Z]

I have this line in my script :

(command "_.BURST" (ssadd ent) "")

I'm getting an error "Unknown command"

Why???

[tramber · Accepted solution]

  (sssetfirst nil  (ssadd ent)) ;makes your selection both gripped and selected. 
  (c:burst)

To me, that's the way to send the command. 

[ВeekeeCZ]

Why? Because it's not a regular built-in command. It's just another LISP function being part of Express tools.

[tramber]

a 

(or c:burst(load "burst.lsp"))

Before ?

[ryanatkins49056]

BURST is an Express Tools command written in AutoLISP. To call it you would need to use

(c:burst)

If you are feeding items from a selection set into it as part of your script you will need to dig down into the AutoLISP file itself.

[Sea-Haven]

Something like this.

(prompt "\nSelect object\n")
(setq ent (ssget "_+.:E:S"))
(command "BURST" ent "")

[Kent1Cooper]

---

@Sea-Haven wrote:

....
(command "BURST" ent "")

---

That has the same problem as in Message 1, because BURST is not a native AutoCAD command, so it cannot be used in an AutoLisp (command) function.  The suggestion by @tramber in Message 2 is the approach to take.  The way to call an AutoLisp-defined command is the (C:YourCommandName) approach.  And since that cannot take User selection or inputs or variables internally, as native AutoCAD commands in a (command) function can, you need to have your selection already selected/highlighted when you call it, which is what the (sssetfirst) function does.  [And it can be a selection of more than one object when you need that.]

[davidEPN6Z]

Thank you all. I used tramber approch and its working. Thanks tramber/