Get Free Ebook Delphi COM Programming
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Delphi COM Programming
Get Free Ebook Delphi COM Programming
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From the Back Cover
Microsoft COM is prevalent throughout Windows operating systems—95, 98, NT-and is rapidly becoming the programming framework of choice. To build applications which interface with Windows systems, programmers must understand and learn to use COM. This book includes coverage of DCOM, Microsoft's distributed architecture that is based on COM. It will also covers the latest developments in Delphi 5. This book will teach COM programming to Delphi 4 and 5 programmers. After providing an understanding of the COM framework, it offers a practical exploration of COM to enable Delphi developers to program component-based applications. Typical real-world scenarios, such as Windows Shell programming, automating Microsoft Agent, and creating and using ActiveX controls, will be explored. Discussion of each topic will be illustrated with detailed examples.
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About the Author
Eric Harmon is Director of Software Development at Advanced Estimating Systems, Inc.-located in Delray Beach, Florida. Advanced Estimating Systems is the developer of The EDGE, the industry standard in construction estimating software. Eric is also a member of TPX (TurboPower eXperts), a volunteer group of programmers that assists the TurboPower Software Company in providing support for its newsgroups. Turbopower is one of the premier providers of tools coded in Delphi for Delphi programmers. Eric was recruited by TurboPower as the original member of TPX in 1997. Eric has been programming professionally in Turbo Pascal, Delphi, and Microsoft Visual C++ since 1983. He has also contributed Delphi and COM-related articles to Visual Developer Magazine. Eric can be reached at Eric.Harmon@tpx.turbopower.com.
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Product details
Paperback: 512 pages
Publisher: Macmillan Technical Publishing; 1st edition (January 2000)
Language: English
ISBN-10: 1578702216
ISBN-13: 978-1578702213
Product Dimensions:
6.2 x 1.2 x 9 inches
Shipping Weight: 1.4 pounds
Average Customer Review:
3.8 out of 5 stars
17 customer reviews
Amazon Best Sellers Rank:
#3,888,390 in Books (See Top 100 in Books)
I'm always suspicious of a book from an author I hadn't heard of before and ordering it online didn't help. Within the first couple of pages I was sure I had bought a rehash of everything I had read about COM in so many other books during the last yearand a half. Seeing the many pages of printed code, while I 'fan previewed' the book convinced me that this was the 'filler' of a lightweight. But this was not so. By page 50 Mr. Harmon was clearly taking me places I hadn't been and by the end of the third chapter, I knew that this book would fit nicely between Danny Thorpe and Ray Konopka on my programmers bookshelf.Eric explains COM from a perspective familiar to a Delphi programmer and doesn't waste time teaching OOP 101 as so many other books of the genre. He starts each new area on friendly turf to a typical delphi programmer, creates a framwork, and builds on that structure to explain rather complex concepts quickly and effectively. I found his method of teaching comprehensive and thorough - yet demanding. If you aren't already reasonably comfortable with OOP than you still have a little more homework to do before you move onto COM. But it'll be here when you are. Even a general understanding of interfaces, com and dcom would be advisable though though he does review the basics briefly. But then he quickly moves through interfaces and drills down into levels that I hadn't encountered and I'm not yet at page 100. About a third of the way through chapter three and I knew I was on the clock - that this book would pay for itself in no time.I must admit that I am only into Chapter 5 now but did catch a peek of all to come. If you are a reasonably seasoned programmer and want to move on to COM with the rest of the Windows programming community, this is how you do it. Simply start reading at page one, do every example in the book as you go along, sometime before the appendix you will have your COM/DCOM wings. The embedded source code is there because it has to be there. Nearly every line is referenced in the narrative and the text depends on it. If you already have programmed some COM/DCOM experience as I had, you may still find the read worthwhile.I must caution that the book is exceptionally dry and without witticisms or amusing anecdotes. Mr. Harmon is down to business and makes no effect to entertain the anyone that I can tell. You won't even find a jab at Microsoft here. But if you want to learn COM/DCOM as a Delphi programmer, you have come to the right place. You can always go out to the club when you're done.
Definitely an improvement over the brief sprints through the subject found in other general Delphi guides, but... When I got my copy, I wondered if I got a different edition. My copy has a picture of ruins, not the elephant in the phone booth pictured above(NOTE: The cover photo has since been changed on Amazon to the ruins.) I was also surprised when several examples from the book didn't work right on Delphi 3 or 5.(Surprised because previous reviewers commented on the examples being usable.) Several features discussed, including not needing to define functions that return HRESULT, would work when called by another Delphi app (only when using an Interface, not DispInterface or Ole Variants), but not from VBA. Changing back to the 'old-style' HRESULT code fixed that. Not only that, but the author seems to forget the names of the recently defined interfaces when referring to them later (ex: IAreaUnitConverter becomes IUnitAuto! ). When I checked the web site to download the examples to try and compare with my code, I found that only selected examples were actually contained in the zip file. All I can figure is that I got a "beta" copy.
Until now the only decent Delphi reference on COM has been the two chapters by John Lam in Marco Cantu's "Delphi Developer's Handbook". This new book presents 500 pages of well written, focused coverage of the practicalities of Delphi's COM implementation. It is ideal for those with moderate Delphi skills who want to come up to speed quickly in writing ActiveX Control or Form solutions, or who want a good explanation of the usage of interfaces, variants, connection points, automation or DCOM.Although it goes into depth in a couple of places - structured storage and property sets in particular - readers will still need to look to people like Binh Ly for advanced discussion of threading models and so forth. I was hoping to find detailed discussion of the internal workings of DAX, TOleContainer and the TComObject/Factory descendants, but most of the code in the book focuses on *using* the VCL framework rather than on its design and the various bugs and gotchas it works around.Those with C++ COM/OLE experience looking for Delphi solutions (eg those rolling their own OLE DB providers, windowless ActiveX controls or Active Document servers) may be disappointed: it's not "Inside ATL" for the VCL. However I think the majority of Delphi developers - who don't have time to read Brockschmidt or Box but just want tools and solutions that work - will find the book a great time-saver and reference. COM newbies wanting Delphi tutorials need look no further.It's certainly an excellent contribution to the Delphi literature. I'll be buying a second copy for the office, but it left me thirsty for more.
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