Essential COM

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Nat Brown was the first person to show me apartments and has irrevocably polluted my vocabulary with the word "schwing. Encouraged by this experience, the development team convinces management to add the new DLL to the final "golden master" CD that is about to go to press. Provided that no changes are made to the four public members of the class, no changes will be required in any client application. The first step was to deploy the class as a Dynamic Link Library (DLL) to decouple the physical package of the class from the packaging of its clients. This inheritance relationship will result in objects that have an object layout that is a binary superset of the layout of the interface class (which ultimately is just a vptr/vtbl).

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My personal recommendation is to assume that anything you read (including this book) may be incorrect or woefully out of date and instead form your own personal understanding of the programming model. It is so important to do these kinds of weekends for the pupils and the staff, it keeps me passionate about my subject. Not coincidentally, when COM objects are accessed across execution context l or machine boundaries, all client-object communications use MS-RPC (an implementation of DeE RPC that is part of Windows NT and Windows 95) as the underlying transport. Thanks to the CORBA and Java partisans and zealots who have engaged me in flame wars on various Usenet newsgroups over the years. Along the way, Box covers the four corners of COM interfaces, classes, apartments, and security--all explained in developer's detail.However, if reuse is the ultimate goal, then implementation inheritance is simply a means to an end but not an end unto itself. This means that the interface methods are immune to symbolic mangling differences between compilers. To add a Fi ndN operation to IFastStri ng that allows finding the nth occurrence of a substring, one would derive a second interface from IFastStr. The GCSE curse at The Conway Centre clearly enhanced our student’s self-confidence, communication and creative skills. If IExtensibleObject was a virtual base class of both IFastString and IPers;stentObject, then this cast would not be ambiguous and the statement would compile.

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Thanks also to Mike Abercrombie of DevelopMentor for creating an environment where personal growth isn't stifled by commerce. Instead, the library vendor must broadcast source code updates to the developer of each client application and hope that they will rebuild their applications to take advantage of the repairs that were made. This capability of client-defined graceful degradation is critical for building robust dynamic systems that can provide extended functionality over time. Instead of providing a solution based on an almost religious academic dogma of object-oriented programming, COM's design takes into account both human nature and capitalism. In either case, the client could use C++'s Runtime Type Identification (RTTI) feature to interrogate the object at runtime to ensure that the requested functionality is indeed supported by the object currently in use.Although this last aspect is useful, it does not go far enough in providing a universal substrate for binary components.

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Certainly, the runtime representation of composite types such as C-style structs can be held invariant across compilers. Software Distribution and C++ To understand the problems related to using C++ as a component substrate, it helps to examine how C++ libraries were distributed in the late 1980s.The severity bit indicates whether the operation succeeded or not, the facility code indicates what technology the HRESULT corresponds to, and the information code is the precise result within the specified technology and severity. against the precise signature of the interface class, and any changes to the interface definition require that the client recompile to take advantage of the change.

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This assumption has been borne out with recent releases of easy-to-use COM tools such as Visual Basic, COM support in Visual C++ 5.Pat Helland spent the entire week of TechEd '97 twisting my brain and forcing me to reexamine most of my basic assumptions about COM. Written by a leading COM authority, this unique book reveals the essence of COM, helping developers to truly understand the why, not just the how, of COM.