April 2002
Intermediate to advanced
688 pages
19h 51m
English
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Name
Loc Function
Class
Microsoft.VisualBasic.FileSystem
Syntax
Loc(filenumber)-
filenumber(required; Integer) Any valid file number
Return Value
A Long indicating the current position of the read/write pointer in a file
Description
Determines the current position of the file read/write pointer
Rules at a Glance
If you have opened the file in Random mode, Loc returns the record number of the last record read or written.
If you have opened the file in Input or Output modes (sequential), Loc returns the current byte position in the file divided by 128.
If you have opened the file in Binary mode, Loc returns the position of the last byte read or written.
Example
Dim fr As Integer = FreeFile( )
Dim sChar As Char
FileOpen(fr, "c:\data.txt", OpenMode.Binary, OpenAccess.Read)
Do While Loc(fr) < LOF(fr)
FileGet(fr, sChar)
Debug.Write(Loc(fr) & ": ")
Console.WriteLine(sChar)
LoopProgramming Tips and Gotchas
For sequential files, the return value of Loc is not required and should not be used.
Note that you cannot set the position of the file pointer using Loc.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.