Essential COM

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They felt that this is an overly simplistic view and that there are actually two kinds of inheritance. This book would have been released considerably earlier had it not been for Terry Kennedy and friends at Software AG. Visual Studio-and especially Visual Basic-hide some of the complexities of COM, but if you a) really want to understand what's happening behind the scenes and/or b) exploit the power of COM, then Don's book is for you.

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Note, however, that this function was exported using extern "C", which suppresses symbolic mangling. Some parts of this library are discussed in the book in detail, but the entire library is included as a demonstration of how to architect de facto C++ implementations.The runtime implementation of virtual functions in C++ takes the form ofvptrs and vtbls in virtually all production compilers. The handle class would simply contain an opaque pointer whose type would never be fully defined in the client's scope.

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In addition, the linker will produce an import library that exposes the symbols for FastStri ng's methods. If all parties agree on a single language for defining interfaces, it is possible to define the interface once and derive new implementation language-specific mappings as they are needed. Interfaces and Implementations Revisited The motivation for separating interface from implementation was to hide from the client all details about an object's inner workings.

The fact is, however, that the world is full of "objectoriented" systems that do not enforce black-box encapsulation and even make it difficult to achieve it. Programmers are using COM to provide plug-in architectures for their applications, build largescale transacted multitier client/server applications for running businesses, provide eye candy on Web pages, control and monitor manufacturing processes, and even track spy satellites by remotely controlling arrays of telescopes. Even the most innocuous change, such as changing the semantics of a method while holding its signature constant, renders the installed client base useless. It appears that all of my hard work was wasted because after reading the final draft of this book it is clear to me that nobody explains COM better than Don.

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This means that if an end-user installs all three client applications, the FastSt ri ng implementation occupies 48MB worth of disk space.

Endorsed by object-orientation guru Grady Booch and Microsoft COM expert Charlie Kindel, Box's book takes the reader from an elucidating discussion of why a demand exists for COM and how it fits into the progression of C++ technology to a cool exhibition of some COM programs he's written. Through disciplined application of these techniques, this chapter presents an architecture for component reuse that allows dynamic and efficient composition of systems from independently developed binary components.