Applying COM+ by Gregory Brill

By Gregory Brill

COM+ is Microsoft's new edition of its COM object-oriented programming framework. outfitted into home windows 2000, this is often an incredibly robust and complicated expertise that consolidates the positive factors of a few current Microsoft instruments: OLE, ActiveX, DCOM, Microsoft Message Queue, and Microsoft Transaction Server. by means of pulling all of those disparate companies into one unified expertise, COM+ carry the promise of higher potency and extra various features for builders who're growing purposes - both company or advertisement software program - to run on a home windows 2000 approach. The call for for trustworthy and real-world application-based info on COM+ is massive, and up to now enormously exceeds the supply of such documentation.This e-book will supply a coherent, unified view of the COM+ structure.

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We will be discussing this in Chapter 5. Inheriting from IDispatch The final puzzler of this section is the following line: interface _Calc : IDispatch { In the earlier section "Implementing COM Objects in Visual C++," I said all interfaces must inherit from IUnknown, and there are absolutely no exceptions. If this is true, why does Calc inherit from something called IDispatch? IDispatch inherits from IUnknown, so Calc is sure to inherit those three special methods that I have not yet explained (all in good time, I promise).

DLLs are always loaded and acted upon by a host process (EXE), so a COM DLL needs to be loaded by an application and asked to register itself. This creates a chicken-or-egg scenario for COM clients: a client needs to know what DLL an object is in if it were to ask the DLL to register itself; but if it knows what DLL the object is in, there is no need for the DLL to register itself. EXE program performs the registration behind the scenes. dll NOTE Note to VB Users: Registration is performed automatically when an ActiveX component is compiled.

If you cut it down to its most basic level, you end up with the following: CoCreateInstance(CLSID_COMCalc, NULL, CLSCTX_ALL , IID_ICalc, (void**)&pICalc); Remember, our type library definition of ICalc was: [ uuid(638094E5-758F-11d1-8366-0000E83B6EF3) ] interface ICalc : IUnknown { Our type library definition for the Calc coclass was: [ uuid(638094E0-758F-11d1-8366-0000E83B6EF3) ] coclass Calc Here are the C++ lines: const GUID CLSID_Calc = { 0x638094e0,0x758f,0x11d1,{ 0x83,0x66,0x00,0x00,0xe8,0x3b,0x6e,0xf3} } ; const GUID IID_ICalc = { 0x638094e5,0x758f,0x11d1,{ 0x83,0x66,0x00,0x00,0xe8,0x3b,0x6e,0xf3} } ; 42 43 This represents how the GUID for the coclass Calc and interface ICalc are written in C++.

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