ExportToAutocad: Stop Prompts to Overwrite File?!

I'm am attempting to export models from Plant 3D using ExportToAutoCAD. However, I don't want to be prompted as to whether I want to overwrite, I just want it to save these files out, whether the file exists or not.

My lisp skills are sorely lacking but I thought I might try this statement, but my syntax is incorrect:

((if(findfile DWGN2))(command "-EXPORTTOAUTOCAD" "2010" DWGN2 "y")(command "-EXPORTTOAUTOCAD" "2010" DWGN2))

What is the correct way to write this?

There is probably much better way to accomplish this task so any help would be much appreciated!

Thanks,
Mitch

You could issue the command, then check if a command is still active. E.g. (untested):

Code:

---

(command "EXPORTTOAUTOCAD" "2010" DWGN2)
(while (> (getvar 'CmdActive) 0) (command "YES"))

---

Alternatively you could check if the file already exists, then use vl-file-delete to delete it before exporting.

BTW, your code has some extra parenthesis: e.g.

Code:

---

((if(findfile DWGN2)) ...

---

Thus the if statement returns a T and that is then interpreted as a function to be called. The T is not a function and would produce an error.