file-length (Function)

Syntax:

Arguments and Values:

stream—a stream associated with a file.

length—a non-negative integer or nil.

Description:

file-length returns the length of stream, or nil if the length cannot be determined.

For a binary file, the length is measured in units of the element type of the stream.

Examples:

 (with-open-file (s "decimal-digits.text"
                    :direction :output :if-exists :error)
   (princ "0123456789" s)
   (truename s))
→ #P"A:>Joe>decimal-digits.text.1"
 (with-open-file (s "decimal-digits.text")
   (file-length s))
→ 10

Exceptional Situations:

Should signal an error of type type-error if stream is not a stream associated with a file.

See Also:

open