Problem with loop instruction

Hello, guys!

I'm new here. So, please, be gentle.

I had a problem with a routine. I have to open all the drawings in the same folder, compare a specific area of the drawing with a reference and change that area, if necessary. But I have a lot of references to compare, so I need to do that many times.

I've already got a batch to open all the drawings in the same folder. So I just modified it to compare the area with the reference and it worked greatly. The only problem is: When i put that batch inside a loop instruction (to change the reference that will be compared), the batch didn't worked. The following error appears:

; error: bad argument type: streamp nil

Here goes the code. Could someone help me?

(defun c:testloop (/)

(setq c 1)

(while (

(c:opendrawings)

(setq c (1+ c))

); end while

); end function to test the loop

(defun c:opendrawings (/ dwglist dwgname dwgpre file openfile uhoh len)

(vl-load-com)

(if (and (setq dwgpre (getvar 'dwgprefix))

(setq dwglist (vl-sort (vl-remove (strcat dwgpre (getvar 'dwgname))

(mapcar '(lambda (dwgname) (strcat dwgpre dwgname))

(vl-directory-files dwgpre "*.dwg")

)

)

'

)

)

(setq uhoh

"Readonly drawings will not be processed!"

)

(setq len (strlen uhoh))

)

(progn (setq openfile (open (setq file (strcat dwgpre "myscript.scr")) "w"))

(progn (foreach f dwglist

(if (and

(not (Is_ReadOnly f))

(/= (checkAttFile f) 1)

)

(progn

(write-line (strcat "_.open \"" f "\"") openfile)

(write-line "_.audit _y" openfile)

;

(write-line "_.qsave _.close" openfile)

)

(setq uhoh (strcat uhoh "\n" f))

)

)

(close openfile)

(command "_.script" file)

(if (= (strlen uhoh) len)

(princ "All drawings successfully processed...")

(alert uhoh)

)

)

)

)

(princ)

); end function to open all the drawings

The "streamp nil" error indicates that your 'openfile' variable is null when write-line is evaluated.

Please read the Code Posting Guidelines and edit your Code to be included in Code Tags.[NOPARSE]

Your Code Here[/NOPARSE]

=

Your Code Here

Ok! Sorry.

Hello, guys!

I'm new here. So, please, be gentle.

I had a problem with a routine. I have to open all the drawings in the same folder, compare a specific area of the drawing with a reference and change that area, if necessary. But I have a lot of references to compare, so I need to do that many times.

I've already got a batch to open all the drawings. So I modified it to compare the area with the reference and it worked greatly. The only problem is: When i put that batch inside a loop instruction (to change the reference that will be compared), the batch didn't worked. The following error appears:

; error: bad argument type: streamp nil

Here goes the code. Could someone help me?

(defun c:testloop (/)
 (setq c 1)
 (while (<= c 5)
   (c:opendrawings)
   (setq c (1+ c))
   ); end while
 ); end function to test the loop

(defun c:opendrawings (/ dwglist dwgname dwgpre file openfile uhoh len)
 (vl-load-com)
 (if (and (setq dwgpre (getvar 'dwgprefix))
   (setq dwglist (vl-sort (vl-remove (strcat dwgpre (getvar 'dwgname))
				     (mapcar '(lambda (dwgname) (strcat dwgpre dwgname))
					     (vl-directory-files dwgpre "*.dwg")
				     )
			  )
			  '<
		 )
   )
   (setq uhoh
	  "Readonly drawings will not be processed!"
   )
   (setq len (strlen uhoh))
     )
   (progn (setq openfile (open (setq file (strcat dwgpre "myscript.scr")) "w"))
   (progn (foreach f dwglist
	    (if	(and
		  (not (Is_ReadOnly f))
		  (/= (checkAttFile f) 1)
		)
	      (progn
		(write-line (strcat "_.open \"" f "\"") openfile)
		(write-line "_.audit _y" openfile)

                           ; <--- Here I put the routines that I need 

		(write-line "_.qsave _.close" openfile)
	      )
	      (setq uhoh (strcat uhoh "\n" f))
	    )
	  )
	  (close openfile)
	  (command "_.script" file)
	  (if (= (strlen uhoh) len)
	    (princ "All drawings successfully processed...")
	    (alert uhoh)
	  )
   )
   )
 )
 (princ)
); end function to open all the drawings

I do not see anything obviously wrong with the posted code. At what point does the code fail? Is the script created? Posting the code that has been left out may help.