By Gregory Brill
COM+ is Microsoft's re-creation of its COM object-oriented programming framework. equipped into home windows 2000, this is often a very strong and intricate know-how that consolidates the gains of a couple of present Microsoft instruments: OLE, ActiveX, DCOM, Microsoft Message Queue, and Microsoft Transaction Server. through pulling all of those disparate providers into one unified know-how, COM+ carry the promise of larger potency and extra different functions for builders who're developing functions - both company or advertisement software program - to run on a home windows 2000 process. The call for for trustworthy and real-world application-based info on COM+ is very large, and to date enormously exceeds the provision of such documentation.This e-book will supply a coherent, unified view of the COM+ structure.
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Extra resources for Applying COM+
4. 4. Registry settings for a typical component. NOTE Following is a list (which is by no means all-inclusive) of common Registry settings. Note that most are optional: • Implemented Categories (Optional). Clients and utilities can look at this entry to determine what a given coclass is capable of and/or what its requirements are. Specifically, there are a number of GUIDs established by Microsoft (check MSDN for details), each one of which indicates a specific capability or requirement. One or many of these GUIDS can be added as subkeys under this key.
Fundamentally, DLLRegisterServer() must do the following two things: • Put path, GUID, friendly string names, and threading information in the Registry • Register the type library The first point is not that complex. COM needs to know where the DLL can be located, what the coclasses (objects) are, and what their GUIDs are. It must also indicate how thread-safe the DLL is that is, can it handle concurrent access from many different threads at once. If the answer is no, COM automatically makes the component thread-safe by providing protection for it.
It was generated when MIDL was run on the IDL file and the MIDL-generated header file (included in this source file). 6. 6. Add (1,2) Set Financial = myCalc In Visual Basic, the Set keyword usually translates to a QueryInterface() method call. Although you do not see or work directly with the GUIDs as you do in C++, they are present and maintained by the development environment. Specifically, by including your component's type library in your project by choosing Project, References, the component's GUIDs are included and implicitly used.
Applying COM+ by Gregory Brill