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The Visual Basic Extensibility Model is poorly documented and poorly understood. Yet, it provides the only means of extending the Visual Basic IDE in ways ranging from the simple (like clearing the Immediate window) to the complex. Developing Visual Basic Add-ins addresses this lack of adequate documentation in a book is both a tutorial and a reference guide for developing VB add-ins.
Most developers can think of dozens of ways in which they could work more productively by extending the IDE in some way. But most developers don't have the time to sift through the documentation and experiment through trial and error to find out how to do it. The purpose of this book is to help clarify the subject of creating Visual Basic add-ins. It covers the basics, showing you how to write useful add-ins, and includes lots of simple coding examples.
This book is broken down into two main parts:
A Visual Basic add-in is a software component that has complete programmatic access to the features of the Visual Basic development environment, officially known as the Visual Basic integrated development environment, or IDE.
If you are like me, you are always looking for ways to perform certain tasks in the VB IDE in a more "natural" way, or simply wishing Microsoft had implemented a certain feature of the IDE in a different manner. In many cases, you can find a way to do what you want using an add-in.
Unfortunately, Microsoft has not brought the issue of creating VB add-ins to the forefront. Indeed, the VB documentation relegates a discussion of add-ins to the later part of the Visual Basic Component Tools Guide. Moreover, the discussion is, shall we say, not as pedagogic as it might be. In addition, amazingly, the VB6 add-in documentation appears to be the same as the VB5 add-in documentation and thus does not reflect the changes made in VB6! (We will discuss these changes, however.)
As further support for Microsoft's disinterest in helping us understand and create add-ins, the MSDN documentation suggests "The easiest way to create an add-in with Visual Basic is to start with the sample provided." This is clearly a copout (which we will avoid).
When I first encountered add-ins under Visual Basic 4, the subject seemed completely shrouded in mystery. I wanted to make some alterations to the VB IDE, in particular to automatically resize code windows, to make keyboard navigation in the VB IDE more natural, and to add block commenting of code. I had to struggle for several days to arrive at an effective add-in.
The purpose of this little book is to help clarify the subject of creating Visual Basic add-ins. It is intended for anyone who has at least a modest acquaintance with Visual Basic-you do not need to be an expert VB programmer.
I do not intend this book to be an encyclopedia on the subject. I will cover the basics, show you how to write useful add-ins, give lots of simple coding examples, and provide you with all of the necessary knowledge to delve into the many darker corners of the subject (which only the folks at Microsoft may fully understand).
I will describe the add-in creation process for Visual Basic version 5 and version 6. Actually, the differences are relatively minor and relate to the initial setup and connection of the add-in rather than to the main programming features. In other words, the extensibility object models for VB5 and VB6 are essentially the same.
1. Preface Contents 2. Introduction The Add-In Creation Process The VB Extensibility Object Model The Visual Basic Add-In Template 3. The Basic Components of an Add-In The Add-In Project Itself Adding the Connect Class Registering an Add-In The Add-In Manager and the Add-In Toolbar Connecting an Add-In 4. Object Models Collection Objects Object Model Hierarchies Object Model Syntax Object Variables 5. Menus and Toolbars Menus and Toolbars: An Overview Menus and Toolbars: The Object Model Example: Creating a Menu Example: A More Elaborate Menu Example: Creating a Toolbar Built-In Face IDs 6. Debugging Add-Ins Setting Break Points in an Add-In Getting Information From a Running Add-In 7. Overview of the Object Model The VBE and Parent Properties Properties and Methods of the VBE Object VB IDE Objects 8. User Interface Objects The Window Object The CodePane Object Example: Clearing the Debug Window Example: Scrolling a Code Pane 9. Project-Related Objects VB Projects The VBProjects Collection The VBProject Object Example: Setting the Start Project 10. Form and Control Objects The VBForm Object VBControls Collections The VBControl Object Example: Setting Tab Stops 11. Event-Related Objects The CommandBarEvents Object FileControlEvents ReferencesEvents SelectedVBControlsEvents VBComponentsEvents VBControlsEvents VBProjectsEvents Experimenting with Events 12. Code-Related Objects The CodeModule Object The Member Object Example: Pushing/Popping Prefixes 13. Add-In Related Objects The AddIns Collection The AddIn Object Built-In Command Bar Controls Face IDs
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