Resetting system variable

[Appollo]

Hi,
I have changed my fieldeval and updatethumbnail system variables to 21 and 0 to help with performance issues in drawings with a lot of attributes and fields. For some reason those keep changing back to their original settings fairly often. They do retain that setting for a little while and at some point change. Any suggestions?
Thanks in advance.

[Adesu]

Hi Apollo,
Use error handling like this code

(defun c:test (/ *error* om otm opt)
  (setq *error* myer)
  (setq om (getvar "xxx"))  
  (setvar "xxx" 0)
  (setq otm (getvar "yyy"))
  (setvar "yyy" 1)

  (setq opt (getstring t "\nPress Esc button to test error: "))
  ;*****PUT YOUR MAIN CODE HERE *******
  
  (setvar "xxx" om)
  (setvar "yyy" otm)
  (setq *error* nil)
  (princ)
  )

(defun myer (msg)
  (setvar "xxx" om)
  (setvar "yyy" otm)
  (setq att "*** Resetting system variable has been done ***")
  (princ att)
  )

Originally Posted by Appollo

Hi,
I have changed my fieldeval and updatethumbnail system variables to 21 and 0 to help with performance issues in drawings with a lot of attributes and fields. For some reason those keep changing back to their original settings fairly often. They do retain that setting for a little while and at some point change. Any suggestions?
Thanks in advance.

[Agostino]

Hi,
The reason may be that some application you have in AutoCAD that does not restore the
settings after changing them. I suggest you to force them by creating a file named acad.lsp in one of your support file search path and add these rows below to it using Notepad.
(setvar "fieldeval" 21)
(setvar "updatethumbnail" 0)
Cheers!