August 2001
Intermediate to advanced
656 pages
18h 5m
English
Content preview from VB .NET Language in a NutshellBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Name
FileLen Function
Class
Microsoft.VisualBasic.FileSystem
Syntax
FileLen(pathname)-
pathname Use: Required
Data Type: String
The filename, along with its path and drive name (optionally)
Return Value
A Long containing the length of the specified file in bytes
Description
Specifies the length of a file on disk
Rules at a Glance
If you don’t specify a drive or folder with
pathname, the file is assumed to be in the
current drive or folder.
Programming Tips and Gotchas
Use the File.Exists method in the System.IO namespace to determine that the file exists before calling
FileLen. If the file does not exist,FileLengenerates runtime error 53, “File not found.”Because
FileLenreturns the length of a file based on the file allocation table, the value returned byFileLenwill reflect the size of the file before it was opened. In the case of open files, you should instead use theLOFfunction to determine the open file’s current length.
See Also
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.