New PDF release: Essential COM

By Don Box

ISBN-10: 0201634465

ISBN-13: 9780201634464

Written by way of a number one COM authority, this particular ebook finds the essence of COM, aiding builders to actually comprehend the why, not only the how, of COM. realizing the incentive for the layout of COM and its allotted facets is important for builders who desire to transcend simplistic purposes of COM and develop into really potent COM programmers, and to stick present with extensions, resembling Microsoft Transaction Server and COM+. field examines COM from the point of view of a C++ developer, delivering a well-recognized body of connection with ease you into the subject.

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Extra resources for Essential COM

Sample text

RTTI is a very compiler-dependent feature. Again, the DWP mandates the syntax and semantics for RTTI, but each compiler vendor's implementation of RTTI is unique and proprietary. This effectively destroys the compiler independence that has been achieved by using abstract base classes as interfaces. This is unacceptable for a vendor-neutral component architecture. One very tractable solution to the problem is to leverage the semantics of dynami c_cast without using the actual compiler-dependent language feature.

In a rare occurrence, management caves in to the wishes of the enthusiastic developers and adds the new DLL to the final product. Like most installation programs, the setup script for the client's product is designed to silently overwrite any older versions of the FastStri ng DLL that may be present on the end-user's machine. 0 should only enhance any existing client applications that had been previously installed. Imagine the following scenario: End-users finally receive their copies of the client's highly anticipated product.

This is because virtual bases are yet another C++ language feature that has several proprietary implementations. RESOURCE MANAGEMENT Resource Management One remaining problem with supporting multiple interfaces from a single object becomes clear when examining the client usage pattern of the Dynami c_Cast method. Consider the following client code: void f(void) { IFastString *pfs = 0; IPersistentObject *ppo = 0; pfs = CreateFastString("Feed BOB"); if (pfs) { ppo = (lPersistentObject *) pfs->Dynami c_Cast("IPersi stentObject"); if (!

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Essential COM by Don Box


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