November 2007
Intermediate to advanced
408 pages
11h 3m
English
Content preview from Microsoft® Office Access 2007 VBABecome 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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Chapter 9. Understanding Scope and Lifetime
IN THIS CHAPTER
Measuring the Lifetime of a Variable or Constant 121
Case Study: Tracking the Current User 126
Scope Explained
The dictionary defines scope as extent of treatment, activity, or influence; range of operation. In VBA terms, scope covers where, within your VBA, a variable can operate or have influence. In Chapter 5, “Building Procedures,” in the section “Public Versus Private,” we discussed the scope of procedures. Variables function similarly using the concepts of scope and lifetime. A variable’s scope defines how other code within your application can see it. The lifetime of a variable dictates when it contains valid data.
A variable’s scope ...
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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.