Problem in IF function

Hi all,can anyone clarify what's the problem in this code and how can I fix it.

  (setq lnam (getstring"\nEnter lay name:"))
 (if ( = lnam t)
   (setvar "clayer" lnam))
 (if ( = lnam nil)
   (setvar "clayer" "0"))

The lnam variable is expected to hold a string, so cannot compare it with T; may help also to validate existance of layer inputted by user:

(if (and (setq lnam (getstring"\nEnter lay name:"))
        (tblsearch "LAYER" lnam))
(setvar "CLAYER" lnam)
(setvar "CLAYER" "0")
)

Since getstring will return an empty string on the user pressing enter, you can use:

(if (tblsearch "layer" (setq l (getstring t "\nLayer name: ")))
   (setvar 'clayer l)
   (setvar 'clayer "0")
)

The lnam variable is expected to hold a string, so cannot compare it with T; may help also to validate existance of layer inputted by user:

(if (and (setq lnam (getstring"\nEnter lay name:"))
        (tblsearch "LAYER" lnam))
(setvar "CLAYER" lnam)
(setvar "CLAYER" "0")
)

Since getstring will return an empty string on the user pressing enter, you can use:

 

(if (tblsearch "layer" (setq l (getstring t "\nLayer name: ")))
   (setvar 'clayer l)
   (setvar 'clayer "0")
)

Thanks guys for respond,

it work fine . I need another thing I want to create layer with entmake and add it to the previous code I am try but it dos not work it create layer but not but it current layer how can i fix this.

thanks for help .

try this

(defun c:test (/)
(if (and (setq lnam (getstring"\nEnter lay name:"))
        (tblsearch "LAYER" lnam))
(setvar "CLAYER" lnam)
(setvar "CLAYER" "0")
)
(entmake
  (list
    (cons 0 "LAYER")
    (cons 100 "AcDbSymbolTableRecord")
    (cons 100 "AcDbLayerTableRecord")
    (cons 2 lnam)
    '(70 . 0)
    '(62 . 2)
    '(6 . "Continuous")))
)

or this

(defun c:test (/)
(if (tblsearch "layer" (setq l (getstring t "\nLayer name: ")))
   (setvar 'clayer l)
   (setvar 'clayer "0")
)
(entmake
  (list
    (cons 0 "LAYER")
    (cons 100 "AcDbSymbolTableRecord")
    (cons 100 "AcDbLayerTableRecord")
    (cons 2 lnam)
    '(70 . 0)
    '(62 . 2)
    '(6 . "Continuous")))
)

Like this?

(if (not (tblsearch "layer" (setq lnam (getstring t "\nLayer name: "))))
(if (entmake (list (cons 0 "LAYER")
                  (cons 100 "AcDbSymbolTableRecord")
                  (cons 100 "AcDbLayerTableRecord")
                  (cons 2 lnam)
                  '(70 . 0)
                  '(62 . 2)
                  '(6 . "Continuous")))
 (setvar "CLAYER" lnam)
 (setvar "CLAYER" "0")
)
)

Did I miss anything ?

Please pay attention that you need to close only DEFUN statement, IF was aleady closed.

Please pay attention that you need to close only DEFUN statement, IF was aleady closed.

I am sorry I think is there something wrong It does not work with me .

Hope this will help you understand the issue:

(defun c:test( / lnam )
(if (not (tblsearch "layer" (setq lnam (getstring t "\nLayer name: "))))
 (if (entmake (list (cons 0 "LAYER")
                   (cons 100 "AcDbSymbolTableRecord")
                   (cons 100 "AcDbLayerTableRecord")
                   (cons 2 lnam)
                   '(70 . 0)
                   '(62 . 2)
                   '(6 . "Continuous")))
  (setvar "CLAYER" lnam)
  (setvar "CLAYER" "0")
 )
)
(princ)
)

Hope this will help you understand the issue:

(defun c:test( / lnam )
(if (not (tblsearch "layer" (setq lnam (getstring t "\nLayer name: "))))
 (if (entmake (list (cons 0 "LAYER")
                   (cons 100 "AcDbSymbolTableRecord")
                   (cons 100 "AcDbLayerTableRecord")
                   (cons 2 lnam)
                   '(70 . 0)
                   '(62 . 2)
                   '(6 . "Continuous"))
  (setvar "CLAYER" lnam)
  (setvar "CLAYER" "0")
 )
)
(princ)
)

I am really appreciate your effort.

Did you test it ? not work again !!

I edited the code here, so missed a parenthesis; I have fixed it now. Please try it again. Sorry for inconvenience!

I edited the code here, so missed a parenthesis; I have fixed it now. Please try it again. Sorry for inconvenience!

Thank man Its work now.

Sound good; you're welcome!