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
FreeFile Function
Class
Microsoft.VisualBasic.FileSystem
Syntax
FreeFile( )
Return Value
An integer representing the next available file number
Description
Returns the next available file number for use in a
FileOpen function
Programming Tips and Gotchas
It is good programming practice to always use
FreeFileto obtain a file number to use in theFileOpenprocedure.You should call
FreeFileand store the returned file number to a variable rather than passing theFreeFilefunction directly as thefilenumberargument of theFileOpenprocedure. In this way, you save the file handle for a subsequent call to theFileCloseprocedure.After using the
FreeFilefunction to retrieve a file handle, you should immediately call theFileOpenprocedure, particularly if your file access code resides in a multithreaded application or component. Failure to do so may cause the same handle to be assigned to two different variables, so that one of the calls toFileOpenfails.
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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.