Export polyline vertex (in order), into a text file

July 28, 2023

Hello,

I'm trying to export a single polyline into a specific text form for inserting to survey camera. like this:

number,Y,X,100.000,p

example:

101,4136625.685,424685.802,100.000,p

1. number always starts from 101,102,103...

2. Z is always 100.000

3. p is always fixed

can you kindly help me ?

July 28, 2023

mAssoc here from Lee Mac in the link below will give you the vertices (coordinates) of a PolyLine. The second link below shows how to write to a text file. Mash the 2 together and off you go!

And very quickly something like this:

(defun c:test ( / )
  (defun mAssoc ( key lst ) ;; Sub function to get the coordinates
    (foreach x lst
      (if (= key (car x))
        (setq l (cons (cdr x) l))
      )
    )
    (reverse l)
  ) ; end sub function

  (setq MyPLine (entget (car (entsel "Select Polyline")))) ;; select an entity. No error checking that  polyline is selected though
  (setq Coords (mAssoc 10 MyPline) ) ;; sun the sub funciotn above, selected line and description '10' for coordinates

  (setq file (open [filePath and Name] "w")) ;; open text file, you put in the file name and file path
  (foreach n Coords  ; a foreach loop each coordiante
    (write-line "101" file) ;; change this if you need different numbers ;; writing to the text file
    (write-line (car n) file) 
    (write-line (cadr n) file)
    (write-line "100.000" file)
    (write-line "p" file)
  ) ; end foreach
  (close file) ;; cloe the text file
  (princ) ;; exit silently
)

(though it is the weekend here, I turned CAD off a couple of hours ago now, so unchecked, there might be an odd typo in there, but you should get the idea)

https://www.afralisp.net/autolisp/tutorials/file-handling.php

July 28, 2023

Thank you sir, I really appreciate your help.

I just tested your code, don't know why it throws too many argument error.

July 29, 2023

Another get pline co-ords, plus a little bit more good learning exercise.

(setq num (getint "\nEnter start number "))
(while (setq plent (entsel "\nPick pline enter to stop"))
(if plent 
(progn 
(setq co-ord (mapcar 'cdr (vl-remove-if-not '(lambda (x) (= (car x) 10)) (entget (car plent)))))
(foreach pt co-ords
; do your write points to file
(setq num (1+ num))
)
)
)
)

July 29, 2023

14 hours ago, Mehran said:

Thank you sir, I really appreciate your help.

I just tested your code, don't know why it throws too many argument error.

Read through the code above (not follow it blindly), there is some homework for you to enter the file path and file name for the file.

Updated code below - you still need to make the same changes though but what I had I think will write each part to a separate line. Also taken a note from BigAl, "enter start number" which I have put to increment on each line: Should work, but if not will test it after the weekend.

(defun c:test ( / MyPline acount Coords MyFileName file n )
  (defun mAssoc ( key lst ) ;; Sub function to get the coordinates
    (foreach x lst
      (if (= key (car x))
        (setq l (cons (cdr x) l))
      )
    )
    (reverse l)
  ) ; end sub function

  (setq MyPLine (entget (car (entsel "\nSelect Polyline: ")))) ;; select an entity. No error checking that polyline is selected
  (setq acount (getint "\nEnter start Number: "))              ;; Enter a number.
  (setq Coords (mAssoc 10 MyPline) )                           ;; Run subfunction mAssoc for '10' in the entity description

  (setq MyFileName [File path and file name here, example "c:\\Folder\\file.txt" using double '\\']  ;;The save path and filename

;;  (if MyFileName(vl-file-delete MyFileName))                  ;; If the file exists, delete it. Take out comment marks (';;') if needed
  (setq file (open MyFileName "w"))                             ;; Open / Create text file for editing.
  (write-line "" file)                                        ;; Blankline before the line data. Comment out (add ';;')if not required
  (foreach n Coords                                             ;; A foreach loop each coordinate
    (setq MyLine (strcat (rtos acount) " " (rtos (car n)) " " (rtos (cadr n)) " 100.000 P" )) ;; Create text line for text file
    (write-line MyLine file)                                    ;; Write text to file
    (setq acount (+ acount 1))                                  ;; Increment reference number by 1
  ) ; end foreach                                               ;; End loop
  (close file)                                                  ;; close the text file
  (princ)                                                       ;; exit silently
)

Edited to add comments to the code above.

This should give a decent start to what you want. Most other things you might want here are somewhere online - find them out and ask how to integrate them perhaps, or ask for more details

Edited July 29, 2023 by Steven P

July 29, 2023

3 hours ago, Steven P said:

Read through the code above (not follow it blindly), there is some homework for you to enter the file path and file name for the file.

Updated code below - you still need to make the same changes though but what I had I think will write each part to a separate line. Also taken a note from BigAl, "enter start number" which I have put to increment on each line: Should work, but if not will test it after the weekend.

(defun c:test ( / MyPline acount Coords MyFileName file n )
  (defun mAssoc ( key lst ) ;; Sub function to get the coordinates
    (foreach x lst
      (if (= key (car x))
        (setq l (cons (cdr x) l))
      )
    )
    (reverse l)
  ) ; end sub function

  (setq MyPLine (entget (car (entsel "\nSelect Polyline: ")))) ;; select an entity. No error checking that polyline is selected
  (setq acount (getint "\nEnter start Number: "))              ;; Enter a number.
  (setq Coords (mAssoc 10 MyPline) )                           ;; Run subfunction mAssoc for '10' in the entity description

  (setq MyFileName [File path and file name here, example "c:\\Folder\\file.txt" using double '\\']  ;;The save path and filename

;;  (if MyFileName(vl-file-delete MyFileName))                  ;; If the file exists, delete it. Take out comment marks (';;') if needed
  (setq file (open MyFileName "w"))                             ;; Open / Create text file for editing.
  (write-line "" file)                                        ;; Blankline before the line data. Comment out (add ';;')if not required
  (foreach n Coords                                             ;; A foreach loop each coordinate
    (setq MyLine (strcat (rtos acount) " " (rtos (car n)) " " (rtos (cadr n)) " 100.000 P" )) ;; Create text line for text file
    (write-line MyLine file)                                    ;; Write text to file
    (setq acount (+ acount 1))                                  ;; Increment reference number by 1
  ) ; end foreach                                               ;; End loop
  (close file)                                                  ;; close the text file
  (princ)                                                       ;; exit silently
)

Edited to add comments to the code above.

This should give a decent start to what you want. Most other things you might want here are somewhere online - find them out and ask how to integrate them perhaps, or ask for more details

Thank you very much..

output is like this:

101.0000 423735.7991 4138278.7044 100.000 P

1. number is float like 101.0000 instead of 101

2. how can I make coordinates output with 3 decimal place. like 423735.799 4138278.704

July 29, 2023

18 minutes ago, Mehran said:

Thank you very much..

output is like this:

101.0000 423735.7991 4138278.7044 100.000 P

1. number is float like 101.0000 instead of 101

2. how can I make coordinates output with 3 decimal place. like 423735.799 4138278.704

I fixed it,

Thanks again

July 29, 2023

Not a problem, always good to see someone read what we offer, understand, learn and have a go at it, fixing or altering to suit.

July 29, 2023

4 hours ago, Steven P said:

Not a problem, always good to see someone read what we offer, understand, learn and have a go at it, fixing or altering to suit.

is there a way to check if polyline is already selected or not?

(setq MyPLine (entget (car (entsel "\nSelect Polyline: "))))

It doesn't matter if I select polyline before executing command, I still need to select polyline.

July 29, 2023

That will break with error :

Expected ENAME ... if you miss selection...

(if (setq MyPLine (car (entsel "\nSelect Polyline: ")))

(setq MyPLineDXF (entget MyPLine))

)

This is how it should look like...

July 29, 2023

16 minutes ago, marko_ribar said:

That will break with error :

Expected ENAME ... if you miss selection...

(if (setq MyPLine (car (entsel "\nSelect Polyline: ")))

(setq MyPLineDXF (entget MyPLine))

)

This is how it should look like...

Hi, Thanks for your reply.

Still wants me to select polyline. even though I've selected my polyline before executing command

July 30, 2023

Have a look at this, only allows 1 pick a time. Press enter will exit.

(while (setq plent (entsel "\nPick pline enter to stop"))

July 30, 2023

44 minutes ago, BIGAL said:
Have a look at this, only allows 1 pick a time. Press enter will exit.
(while (setq plent (entsel "\nPick pline enter to stop"))

Hello Sir, thanks.

No, still the same

July 30, 2023

I think if you are selecting many lines all at once you will want to use a selection set instead of selecting them using entsel. This is a decent reference guide http://lee-mac.com/ssget.html

Quickly and no testing, replace

  (setq MyPLine (entget (car (entsel "\nSelect Polyline: ")))) ;; select an entity. No error checking that polyline is selected

with

princ "\nSelect polylines: ")
(setq MySS (ssget '(( 0 . "LWPOLYLINE"))) ) ;Selection. Filtered for polylines
(setq SSCount 0)
(while (< SSCount (sslength MySS))
  (setq MyPLine (entget (ssname MySS SSCount)))

;;;;; The rest of the code here

;;;;; Until
  (close file)                                                  ;; close the text file

;;;;; Then add in these 2 lines
  (setq SSCount (+ SSCount 1))
) ; End while

A quick edit and perhaps not the most optimised method, but it should work

Edited July 30, 2023 by Steven P

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Export polyline vertex (in order), into a text file

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