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Validates a given URL.

Signature

VBA : RetVal = object.IsURL(URL)

VL : RetVal = (vla-IsURL object URL)

(vla-IsUrl util "http://www.afralisp.com")

• Object : Utility
  The object or objects this method applies to.

• LocalFile : String; input-only
  The URL to validate.

• RetVal : Boolean
  TRUE: The string represents a valid URL.
  FALSE: The string is not a valid URL.

Remarks

The definition of a "valid" URL is application-dependent, in that a given 3rd party application may not be interested in supporting all Internet protocols. For instance, an application that attempts to connect users to Web sites would probably not need to provide access to FTP sites. In this hypothetical application, a FALSE value would be returned if a URL that begins with something other than "http://" was entered.

The default functionality of this method for AutoCAD supports FTP, HTTP, HTTPS, and FILE protocols.

Example :

(defun c:al-isurl ()

(vl-load-com)

(setq util (vla-get-utility 
                   (vla-get-activedocument 
                        (vlax-get-acad-object))))
                        
(setq flag (vla-IsUrl util "http://www.afralisp.com"))

(princ flag)

(princ)

);defun