August 2004
Intermediate to advanced
312 pages
8h 30m
English
Content preview from Excel 2003 Programming: A Developer's NotebookBecome 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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Common Questions
Whew, this chapter is already longer than I planned and (I fear) too complicated. In order to simplify things a bit, I include the following common security problems, with brief descriptions of how to solve them. I hope it helps!
What is partial trust?
The Excel macro security model is based on trust and known publishers. Macro code is digitally signed and that signature identifies the source (publisher) of the macro. At that point, the user makes the decision whether to trust that publisher. The inference here is that if the macro does something bad, the user will no longer trust that publisher and possibly pursue damages through the legal system.
In Excel and other applications that implement the Common Object Model (COM), trust is absolute. You either trust someone or you don’t. In fact, this isn’t a perfect system for the real world, where you might trust someone but not want to lend them your car keys, or your credit card, or your bank PIN.
There are situations where you might want to partially trust an application. Microsoft addresses this in the .NET Framework. Applications written with .NET can be granted partial trust, so they can run but not read the system registry or write to disk, for example.
There are some situations where .NET applications require full trust. For instance, a .NET application must be fully trusted in order to use Excel. You can’t use .NET to create partially trusted wrappers for COM applications.
See Chapter 5, “Program ...
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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.