Essential COM

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Understanding the motivation for the design of COM and its distributed aspects is critical for developers who wish to go beyond simplistic applications of COM and become truly effective COM programmers. The copper alloy in sterling silver can cause it to ‘tarnish’, causing a black or brownish coating to form on your jewellery. Two people who I know for certain suffered more than I did were my patient wife, Barbara, and my tolerant son, Max (who prefers COM to other object models despite his youth). Once the FastStri ng code is linked into the client application, one can no longer simply replace the FastStri ng code directly at the enduser's machine. This content was uploaded by our users and we assume good faith they have the permission to share this book.

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Although this book is a year late because I couldn't say no to Terry (this is my fault, not Terry's), I think that the book is infinitely better due to the time I spent working on the project. Like the library vendor, they too are pleasantly surprised, as no source code modifications are required to take advantage of the new version of Length. The C++ implementation class will contain the actual data members required to implement the object's functionality. While tedious, this allows any compiler to gain linklevel compatibility with the DLL, provided the library vendor has anticipated its use ahead of time and has provided a proper DEF file.The fact that it was moved to IPersist illustrates the principle of keeping the COM model as simple as possible. Clearly, the modularity of the FastStri ng component is lost once the client runs the linker and produces the final executable. Imagine the following scenario: End-users finally receive their copies of the client's highly anticipated product. Kraig Brockschmidt explained to me that one particular aspect of COM that looks incredibly elegant was actually a grotesque last-minute hack. Other Microsoft people who have influenced my work through their own include Tony Williams, Bob Atkinson, Craig Whittenberg, Crispin Goswell, Paul Leach, David Kays, Jim Springfield, Christian Beau~ont, Mario Goertzel, and Michael Montague.

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Although one could conceivably add Load and Save methods to an extended version of IFastStri ng, it is likely that other types of objects that are not IFastStri ng compatible can also be persistent. This seems innocent enough, as the modifications did not affect the public interface of the class, so the silent machine-wide upgrading to FastString version 2. Students consistently get the opportunity to further develop their art skills and try out new skills or ways of working. He has also held the Microsoft MVP Award since 2007 for his contributions to the C++ development co . The term execution context is used by the COM specification to describe what has since been renamed an apartment.COM IDL simply adds a few COM-specific extensions to DCE IDL to support the objectoriented nature of COM (e. This means that the interface methods are immune to symbolic mangling differences between compilers. This sort of white box reuse often results in a tremendous amount of coupling between the client application and class library, adding to the fragility of the overall code base over time. Because implementation inheritance often causes details of a base class' implementation to "leak," violating the encapsulation of the class, COM's designers felt that the use of implementation inheritance should be restricted to programming within components. extern calculator *pcalc; pcalc->addl(l); pcalc->add2(1, 2); Although the generated machine code does not need to be identical for all compilers, it needs to be equivalent.