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The Component Object Model (COM) was Microsoft s previous application development framework, which first appeared on the programming landscape circa 1991 (or 1993, if you regard COM s introduction with the birth of OLE 1.0). COM is an architecture that says, in effect, If you build your types in accordance with the rules of COM, you end up with a block of reusable binary code. These binary blobs of COM code are often called COM servers . One benefit of a binary COM server is that it can be accessed in a language-independent manner. Thus, C++ programmers can build COM classes that can be used by VB6; Delphi programmers can use COM classes built using C, and so forth. However, as you may be aware, COM s language independence is somewhat limited. For example, there is no way to derive a new COM class using an existing COM class (as COM has no support for classical inheritance). Rather, are limited to reuse via the has-a relationship. Another benefit of COM is its location-transparent nature. Using constructs such as the system registry, application identifiers (AppIDs), stubs, proxies, and the COM runtime environment, programmers can avoid the need to work with raw sockets, RPC calls, and other low-level details when building a distributed application. For example, consider the following VB6 COM client code: ' The MyCOMClass class could have be written in ' any COM-aware language, and may be located anywhere ' on the network (including your local machine). Dim obj as MyCOMClass Set obj = New MyCOMClass ' Location resolved using AppID. obj.DoSomeWork

hook_search_status(): This function reports the status of reindexing the content in the database. It returns a value of the total number of items to index and the number of items left to index. hook_search_access(): This function allows a module to define permissions for a search tab. If the user does not have the proper permissions, then the tab will not be displayed on the search form. hook_search_admin(): This function adds elements to the search settings form.

Although COM can be considered a very successful object model, it is extremely complex under the hood (at least until you have spent many months exploring its plumbing especially if you happen to be a C++ programmer). To help simplify the development of COM binaries, programmers can make use of numerous COM-aware frameworks. For example, the Active Template Library (ATL) provides a set of C++ classes, templates, and macros to ease the creation of COM servers. Many other languages also hide a good part of the COM infrastructure from view. However, language support alone is not enough to hide the complexity of COM. Even when you choose a relatively simple COM-aware language such as VB6, you are still forced to contend with fragile registration entries and numerous deployment-related issues (collectively, and somewhat comically, termed DLL hell).

Although COM certainly facilitates the construction of software applications using a variety of different programming languages, the language-independent nature of COM was not as straightforward as one would hope Some of the complexity is due to the simple fact that applications that are woven together using diverse languages are completely unrelated from a syntactic point of view For example, JScript has a syntax much like C, while VBScript is a subset of VB6 The COM servers that are created to run under the COM+ runtime (a Windows OS feature which provides common services to custom code libraries [transactions, object lifetime, security, etc]) have an entirely different look and feel from the web-centric ASP pages that invoke them The result was a rather confused mishmash of technologies Furthermore, and perhaps more important, each language and/or technology has its own type system (that may look nothing like another s type system).

Formatting Search Results with hook_search_page()

Beyond the fact that each API ships with its own collection of prefabricated code, even basic data types cannot always be treated identically A CComBSTR in ATL is not quite the same as a String in VB6, both of which have nothing to do with a char* in C Given that each language has its own unique type system, COM programmers typically needed to be very careful with building public methods on public COM classes For example, if a C++ developer needed to create a method that returned an array of integers to a VB6 application, they would be up to their eyeballs in complex COM API calls to construct a SAFEARRAY structure, which could easily require dozens of line of code In the COM world, the SAFEARRAY data type is the only way to build an array that all COM frameworks understand.

If the C++ developer simply returned a native C++ array, VB6 would have no clue what to do with it Similar complexities could be found when building methods that manipulate simple string data, references to other COM objects, or even a trivial BOOLEAN value! To put it politely, COM programming is a very asymmetrical discipline..