By Don Box
Written by means of a number one COM authority, this precise booklet unearths the essence of COM, supporting builders to actually comprehend the why, not only the how, of COM. figuring out the inducement for the layout of COM and its dispensed features is important for builders who desire to transcend simplistic functions of COM and develop into actually powerful COM programmers, and to stick present with extensions, equivalent to 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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Written by way of a number one COM authority, this specific ebook finds the essence of COM, aiding builders to actually comprehend the why, not only the how, of COM. realizing the inducement for the layout of COM and its allotted facets is important for builders who desire to transcend simplistic purposes of COM and turn into really powerful COM programmers, and to stick present with extensions, reminiscent of Microsoft Transaction Server and COM+.
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Extra resources for Essential COM
One motivation for using the technique is to avoid having operating system (OS)-generated errors when the client program is run on a machine that does not have the object implementation installed. Applications that use optional system components such 21 22 CHAPTER 7; COM AS A BETTER C++ as WinSock or MAPI use a similar technique to allow an application to run on minimally configured machines. Because the client never needs to link against the DLL's import library, the client has no load dependences on the DLL and can execute on machines that do not have the DLL installed.
IDL supports structures, unions, arrays, enumerations, and typedefs with a syntax identical to that of their C counterparts. When defining COM methods in IDL, one needs to indicate explicitly whether the caller or the callee will be writing or reading each method parameter. This is accomplished using the parameter attributes [i n] and [out]: void Methodl([in] long argl, [out] long *parg2, [in, out] long *parg3); For this IDL fragment, the caller is expected to pass a value to the object in argl and in the location referred to by parg3.
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. EXE that parses COM IDL files and generates several artifacts. TLB C/C++ Type Definitions GU/D Tokenized IOL File for Visual Basic, Java, etc. 1 Using MIDL 1 The term execution context is used by the COM specification to describe what has since been renamed an apartment.
Essential COM by Don Box