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Vb Com, by Thomas Lewis
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Amazon.com Review
The Microsoft Component Object Model (COM) is the foundation behind Visual Basic 6, even if Visual Basic (VB) hides most of the inner details. To write better VB programs for the enterprise, chances are you'll need to take on at least some of the intricacies of COM. VB COM: A Visual Basic Programmer's Introduction to COM provides an approachable guide to today's COM and other Microsoft technologies. The book begins with one of the most approachable and effective tours of COM you're likely to find anywhere. The author covers COM components along with fundamental terms (such as interfaces, globally unique identifiers (GUIDs), IUnknown, and the registry) with a minimum of hassle. In a section on OLE Automation, the author shows how to use VB to script Excel spreadsheets, while explaining the details of early and late binding, IDispatch, and dual interfaces. Next the author discusses how to build components, starting with ActiveX servers (both dynamic-link libraries [DLLs] and standalone EXEs) and proceeding to ActiveX controls. (The section on building controls is particularly strong, with good coverage of Ambient and Extender objects and connection points for event handling.) Throughout, VB COM relies on tools-based examples, with plenty of screen shots from VB 6 tools (such as its Class Builder Wizard). Later the book moves on to the enterprise with coverage of Distributed COM (DCOM), multitiered architectures, Microsoft Transaction Server (MTS), and emerging standards such as COM+. In all, VB COM delivers a clear picture of the inner workings of COM for the VB developer with a useful mix of simplicity and essential technical detail. --Richard Dragan
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From the Publisher
This book is geared towards the Visual Basic programmer who wants to begin discovering the benefits of Microsoft's Component Object Model (called COM) and how to use COM to build more dynamic applications.
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Product details
Paperback: 344 pages
Publisher: Apress; 1st edition (February 1999)
Language: English
ISBN-10: 1861002130
ISBN-13: 978-1861002136
Product Dimensions:
7.2 x 1 x 9.2 inches
Shipping Weight: 1.4 pounds (View shipping rates and policies)
Average Customer Review:
3.8 out of 5 stars
31 customer reviews
Amazon Best Sellers Rank:
#4,026,582 in Books (See Top 100 in Books)
This book has too many pages full of screen shots. Aside from that however, and some funky humor, the book is great for entry-level VB COM developers. The material is easy to follow, the examples are great, and you'll learn from this book!
Very good book to introduce into the complex field of COMs. In my 7 yrs of programming, this book actually explains the subject of COMs in a very easy to understand manner.
I am torn between liking this book for its style and excellent way of communicating the subject matter and disliking it for the lack of consistency.The book starts out with an "introduction" to COM in a way that would be more confusing than helpful for beggining programmers... I barely made it out after reading through a lot of "unnecessary" content for what was about to come. It seems, after reading this "introductory" cahpter, that the books was going to be at a higher level than what it actually was. The following chapters were excellent, easy to follow but maybe, just maybe way too basic. What I mean is that for a book at this "level" the author, for example, shouldn't have to explain what passing a parameter by reference or by value are and how they differ. Even though the book is an introduction to COM it shouldn't be an introduction to programming? and therefore these concepts should be assumed, and like this example I found more than a handful of other ones with similar toneThen the book takes a couple of interesting turns and covers alot of ground in a very short period of time, and does so very well.It essence I think it is a great book as an INTRODUCTION to COM, not appropriate for the Programmer to Programmer Series in my opinion. If you have a clear concept of what COM is and if you are looking for more of an implementation guide, you shouldn't look at this book. I finished it, because I started it!, otherwise it was just a nice review and an "entertaining" refresher course. After reading through the first couple of chapters I knew I wasn't going to find many nuggets of golden knowledge here.Additionally, as of this date, the book is a little bit outdated, but the concepts that it covers are always helpful in the learning process for newer technologies and even for competing ones.
COM is a programmatic challenge in C++. Unfortunately many in-depth discussions of COM assume that you need to know all those pointer-level details. But as a VB developer, much of COM's interface complexity is handled automatically. Mr. Lewis approaches COM with this understanding.The text is readable and thorough. Its diagrams have been stripped down to the specifics of each discussion. Even the lollipop diagrams are understandable. (I easily forgive the barnyard analogies.) The author attempts to clarify rather than dazzle. He makes IUnknown feel more like a friend than a stranger.This is a worthwhile reference on its own, and a good supplemental text when studying for the VB Distributed (i.e., "VB COM") exam, 70-175. Its comfortable writing style belies a richness of content. The author's focus on his target audience is sustained and appropriate. No single book can cover everything (and you really don't want to see everything) about COM.If you wish to bathe in the ugly realities of COM from a C++ perspective, Prendergast's MCSD Solution Architectures book is painfully detailed, and mostly about COM. (I do not recommend Prendergast for 70-100 exam preparation, if you're a VB developer.)Weaknesses: Significant performance issues which relate to programming COM, DCOM and MTS are not addressed in great enough depth, nor with great enough emphasis. A good in-process COM object usually makes a dreadful object in MTS. Likewise, the critical need for custom marshaling of parameters to DCOM objects is slighted, as is the disastrous performance penalties of using collections.A word about errors and editing. In the publishing industry, most book manuscripts require 18 to 36 months to reach the bookshelf. For books on emerging (and rapidly changing) technologies, publishers have gotten the cycle down to an astounding 6 to 9 months. Hence, more errors. My experience with Wrox books is that the errors are few, and tend to be typographical. Their technical editors are among the most thorough in the industry. In this particular book, the occasional errors are inconsequential.Conclusion: If you are a VB developer who needs to learn more about COM, this is a solid choice. If you are a 70-175 exam candidate, read this book and enjoy that warm deja vu satisfaction after passing the exam. If you'll be doing COM with C++, buy a different book.
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