how to "If error - resum next"?

[aridzv]

Hi.

I need to resum the lisp if a call to a function return error.

for example - here I try to get an attribute value but the attribute don't exist in the block:

(LM:getattributevalue (car blk1) "MAN11") ;; error raised because MAN11 don't exist
;;IGNORE ERROR AND MOVE TO THE NEXT LINE

I need the lisp to ignore that error and contiue to the next line of code.

to explain:

I have attributes that appear in some of my blocks and don't appear in others.

if the block that the lisp refer to don't have that attribute it's o.k. - just move on to the next line.

 

thanks,

aridzv.

 

EDIT:

here is Lee Mac LM:getattributevalue Function:

;; Get Attribute Value  -  Lee Mac
;; Returns the value held by the specified tag within the supplied block, if present.
;; blk - [ent] Block (Insert) Entity Name
;; tag - [str] Attribute TagString
;; Returns: [str] Attribute value, else nil if tag is not found.

(defun LM:getattributevalue ( blk tag / val enx )
    (while
        (and
            (null val)
            (setq blk (entnext blk))
            (= "ATTRIB" (cdr (assoc 0 (setq enx (entget blk)))))
        )
        (if (= (strcase tag) (strcase (cdr (assoc 2 enx))))
            (setq val (cdr (assoc 1 (reverse enx))))
        )
    )
)

 

Edited August 29, 2023 by aridzv

[Lee Mac]

My function will not error if the supplied attribute tag does not exist - it will simply return nil.

 

As such, you can test for returned value using a simple if statement, e.g.:
 

(if (setq value (LM:getattributevalue (car blk1) "MAN11"))
    ;; do stuff
)

 

[aridzv]

2 hours ago, Lee Mac said:

My function will not error if the supplied attribute tag does not exist - it will simply return nil.

 

As such, you can test for returned value using a simple if statement, e.g.:
 

(if (setq value (LM:getattributevalue (car blk1) "MAN11"))
    ;; do stuff
)

 

 

acctually I did before posting the question and it failed...

I used this and it works:

(vl-catch-all-apply (setq M1 (LM:getattributevalue (car blk1) "MAN111")))

 

in the comment below I'm sharing the final code that is working.

[aridzv]

Here is the final code (see the different between autocad and bricscad in the code):

(defun c:ReplaceBlockS () (c:RBS))
(defun c:RBS (/ answr ent idx newblock newname blk newblock obj ss M1 M2 M3 C1 C2 C3 E1 E2 E3 ITD GR ORD QTY QTY1 SYS UN MANDIA MANGR x)
 (vl-load-com)

(setq temperr *error*);;store *error*
(setq *error* trap1);;re-assign *error*

(setvar "CMDECHO" 0)
 (command ".undo" "be")
(setvar "CMDECHO" 1)

(princ)
(prompt "\nselect blocks,Enter To End Selection")
 ;;if the user selects something, inputs a ne block name AND it exists in the dwg...
 (if (and (setq ss (ssget '((0 . "INSERT")))) ;; (ssget ":S" '((0 . "INSERT")))
   ;;(setq newblock (entget (car (entsel "\nPick instance of new block: ")))) ;;Autocad
   (setq newblock (entsel "\nPick instance of new block: ")) ;;Bricscad
   (setq newname (getpropertyvalue (car newblock) "EffectiveName~Native")) ;;Bricscad
   ;;(setq newname (cdr (assoc 2 newblock))) ;;Autocad
   (tblobjname "BLOCK" newname)

(vl-catch-all-apply (setq M1 (LM:getattributevalue (car newblock) "MAN1")))
(vl-catch-all-apply (setq M2 (LM:getattributevalue (car newblock) "MAN2")))
(vl-catch-all-apply (setq M3 (LM:getattributevalue (car newblock) "MAN3")))
(vl-catch-all-apply (setq C1 (LM:getattributevalue (car newblock) "CAT1")))
(vl-catch-all-apply (setq C2 (LM:getattributevalue (car newblock) "CAT2")))
(vl-catch-all-apply (setq C3 (LM:getattributevalue (car newblock) "CAT3")))
(vl-catch-all-apply (setq E1 (LM:getattributevalue (car newblock) "ERP1")))
(vl-catch-all-apply (setq E2 (LM:getattributevalue (car newblock) "ERP2")))
(vl-catch-all-apply (setq E3 (LM:getattributevalue (car newblock) "ERP3")))
(vl-catch-all-apply (setq ITD (LM:getattributevalue (car newblock) "ITEM_DESCRIPTION")))
(vl-catch-all-apply (setq GR (LM:getattributevalue (car newblock) "GRUOP")))
(vl-catch-all-apply (setq UN (LM:getattributevalue (car newblock) "UNIT")))
(vl-catch-all-apply (setq MANDIA (LM:getattributevalue (car newblock) "MANIFOLD_DIA")))
(vl-catch-all-apply (setq MANGR (LM:getattributevalue (car newblock) "MANIFOLD_GRUOP")))
;;(vl-catch-all-apply (setq ORD (LM:getattributevalue (car newblock) "ORDER"))) ;; don't change
;;(vl-catch-all-apply (setq SYS (LM:getattributevalue (car newblock) "SYSTEM"))) ;; don't change
(vl-catch-all-apply (setq QTY (LM:getattributevalue (car newblock) "QUANTITY"))) ;; don't change


;;   (setq M2 (strcase (vla-get-tagstring "MAN2")))
;;   (setq M3 (strcase (vla-get-tagstring "MAN3")))
;;   (setq C1 (strcase (vla-get-tagstring "CAT1")))
;;   (setq C2 (strcase (vla-get-tagstring "CAT2")))
;;   (setq C3 (strcase (vla-get-tagstring "CAT3")))
;;   (setq E1 (strcase (vla-get-tagstring "ERP1")))
;;   (setq E2 (strcase (vla-get-tagstring "ERP2")))
;;   (setq E3 (strcase (vla-get-tagstring "ERP3")))
;;   (setq ITD (strcase (vla-get-tagstring "ITEM_DESCRIPTION")))
;;   (setq GR (strcase (vla-get-tagstring "GRUOP")))
;;   (setq ORD (strcase (vla-get-tagstring "ORDER")))
;;   (setq QTY (strcase (vla-get-tagstring "QUANTITY")))
;;   (setq SYS (strcase (vla-get-tagstring "SYSTEM")))
;;   (setq UN (strcase (vla-get-tagstring "UNIT")))
;;   (setq MANDIA (strcase (vla-get-tagstring "MANIFOLD_DIA")))
;;   (setq NANGR (strcase (vla-get-tagstring "MANIFOLD_GRUOP")))


   )
   (progn
     (setq idx -1)
     (while (setq ent (ssname ss (setq idx (1+ idx))))
(setq obj (vlax-ename->vla-object ent))
(vla-put-name obj newname);;change the name



 (if (setq x (getpropertyvalue ent "d1"))
  (progn
        (vl-catch-all-apply (setq QTY1 (LM:getattributevalue ent "QUANTITY")))
	(vl-catch-all-apply (setq QTY1 (* 1000 (atof QTY1))))
	(vl-catch-all-apply (setq QTY1 (rtos QTY1 2 3)))
	(vl-catch-all-apply (setpropertyvalue ent "d1" QTY1))
   )    
)

(vl-catch-all-apply (LM:setattributevalue ent "MAN1" M1))
(vl-catch-all-apply (LM:setattributevalue ent "MAN2" M2))
(vl-catch-all-apply (LM:setattributevalue ent "MAN3" M3))
(vl-catch-all-apply (LM:setattributevalue ent "CAT1" C1))
(vl-catch-all-apply (LM:setattributevalue ent "CAT2" C2))
(vl-catch-all-apply (LM:setattributevalue ent "CAT3" C3))
(vl-catch-all-apply (LM:setattributevalue ent "ERP1" E1))
(vl-catch-all-apply (LM:setattributevalue ent "ERP2" E2))
(vl-catch-all-apply (LM:setattributevalue ent "ERP3" E3))
(vl-catch-all-apply (LM:setattributevalue ent "ITEM_DESCRIPTION" ITD))
(vl-catch-all-apply (LM:setattributevalue ent "GRUOP" GR))
(vl-catch-all-apply (LM:setattributevalue ent "UNIT" UN))
(vl-catch-all-apply (LM:setattributevalue ent "MANIFOLD_DIA" MANDIA))
(vl-catch-all-apply (LM:setattributevalue ent "MANIFOLD_GRUOP" MANGR))
;;(vl-catch-all-apply (LM:setattributevalue ent "ORDER" ORD)) ;; DON'T CHANGE
;;(vl-catch-all-apply (LM:setattributevalue ent "QUANTITY" QTY)) ;; DON'T CHANGE
;;(vl-catch-all-apply (LM:setattributevalue ent "SYSTEM" SYS)) ;; DON'T CHANGE

;;(vla-put-textstring "MAN1" M1)
;;(vla-put-textstring "MAN2" M2)
;;(vla-put-textstring "MAN3" M3)
;;(vla-put-textstring "CAT1" C1)
;;(vla-put-textstring "CAT2" C2)
;;(vla-put-textstring "CAT3" C3)
;;(vla-put-textstring "ERP1" E1)
;;(vla-put-textstring "ERP2" E2)
;;(vla-put-textstring "ERP3" E3)
;;(vla-put-textstring "ITEM_DESCRIPTION" ITD)
;;(vla-put-textstring "GRUOP" GR)
;;(vla-put-textstring "ORDER" ORD)
;;(vla-put-textstring "QUANTITY" QTY)
;;(vla-put-textstring "SYSTEM" SYS)
;;(vla-put-textstring "UNIT" UN)

(vla-update obj)
)
     )
   )
 (command ".undo" "end")
 (princ (strcat "\nReplaced " (itoa idx) " blocks......"))
 (princ)
 )

;; Get Attribute Value  -  Lee Mac
;; Returns the value held by the specified tag within the supplied block, if present.
;; blk - [ent] Block (Insert) Entity Name
;; tag - [str] Attribute TagString
;; Returns: [str] Attribute value, else nil if tag is not found.

(defun LM:getattributevalue ( blk tag / val enx )
    (while
        (and
            (null val)
            (setq blk (entnext blk))
            (= "ATTRIB" (cdr (assoc 0 (setq enx (entget blk)))))
        )
        (if (= (strcase tag) (strcase (cdr (assoc 2 enx))))
            (setq val (cdr (assoc 1 (reverse enx))))
        )
    )
)


;; Set Attribute Value  -  Lee Mac
;; Sets the value of the first attribute with the given tag found within the block, if present.
;; blk - [ent] Block (Insert) Entity Name
;; tag - [str] Attribute TagString
;; val - [str] Attribute Value
;; Returns: [str] Attribute value if successful, else nil.

(defun LM:setattributevalue ( blk tag val / enx )
    (if (and (setq blk (entnext blk)) (= "ATTRIB" (cdr (assoc 0 (setq enx (entget blk))))))
        (if (= (strcase tag) (strcase (cdr (assoc 2 enx))))
            (if (entmod (subst (cons 1 val) (assoc 1 (reverse enx)) enx))
                (progn
                    (entupd blk)
                    val
                )
            )
            (LM:setattributevalue blk tag val)
        )
    )
)

 

2 comments:

1. the reason for the vl-catch-all-apply is that some of my blocks contain 2 more tags so I need the lisp to work on both types.

2. I could'nt update the parametric blocks  parameter "d1" (see the second part of the lisp).

    if some one can look on it and help me find a solution it will be nice...

 

thanks,

aridzv. 

Edited August 29, 2023 by aridzv

[BIGAL]

Just a suggestion rather than commenting out the Acad / Bricscad use (vlax-product-key) in an IF with Wcmatch looking for Bricsys or BricsCAD then code works in Both.

 

[aridzv]

25 minutes ago, BIGAL said:

Just a suggestion rather than commenting out the Acad / Bricscad use (vlax-product-key) in an IF with Wcmatch looking for Bricsys or BricsCAD then code works in Both.

 

 

Nice...

How do I do it?...

[Lee Mac]

21 hours ago, aridzv said:

acctually I did before posting the question and it failed...

I used this and it works:

(vl-catch-all-apply (setq M1 (LM:getattributevalue (car blk1) "MAN111")))

 

in the comment below I'm sharing the final code that is working.

 

I don't see how that could possibly work - it's not the correct syntax for the vl-catch-all-apply function.

[aridzv]

@Lee Mac

 

I don't know...

I have a big problem to catch an error and resume the lisp.

 

here is an example:

I need to check if a parameter (Bricscad parameter) exist and I use this code:

(if (setq x (getpropertyvalue ent "d1")))

 

if the parameter exist all is well and the lisp works,

But if it doesn't exist, the lisp throws an error instead of taking the "IF" result as false and moving on.

I rely don't know how to solve this issue and I'll be glad for any help.

thanks,

aridzv.

[BIGAL]

Like this.

(if (setq x (getpropertyvalue ent "d1"))
(progn
(true) ; lots of code
)
(progn
(false) ; lots of code
)
)