xdsize (AutoLISP)

Returns the size (in bytes) that a list occupies when it is linked to an object (entity) as extended data

Supported Platforms: Windows and Mac OS

Signature

(xdsize lst)

lst

Type: List

A valid list of extended data that contains an application name previously registered with the use of the regapp function.

Return Values

Type: Integer

An integer reflecting the size, in bytes. If unsuccessful, xdsize returns nil.

Brace fields (group code 1002) must be balanced. An invalid lst generates an error and places the appropriate error code in the AutoCAD ERRNO system variable. If the extended data contains an unregistered application name, you see this error message (assuming that the AutoCAD CMDECHO system variable is on):

Invalid application name in 1001 group

Examples

The lst can start with a -3 group code (the extended data sentinel), but it is not required. Because extended data can contain information from multiple applications, the list must have a set of enclosing parentheses.

(-3 ("MYAPP" (1000 . "SUITOFARMOR")
             (1002 . "{")
             (1040 . 0.0)
             (1040 . 1.0)
             (1002 . "}")
   )
)

Here is the same example without the -3 group code. This list is just the cdr of the first example, but it is important that the enclosing parentheses are included:

( ("MYAPP" (1000 . "SUITOFARMOR")
           (1002 . "{")
           (1040 . 0.0)
           (1040 . 1.0)
           (1002 . "}")
   )
)