ActiveX programming unleashed by Weiying Chen

By Weiying Chen

A consultant to internet programming with ActiveX. The publication covers ActiveX Controls, lively scripts, ActiveX files, web Server API (ISAPI), low and high point interfaces for downloading information from the web, ActiveX Server Framework and sceurity and optimization matters for ActiveX programmers

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Htm (3 of 40) [7/1/2002 11:55:22 PM] Chapter 3 - ActiveX Unleashed COM predefines a set of interfaces to be used by client/server applications. Among these, IUnknown and IClassFactory interfaces are the most fundamental ones. IUnknown interface is required for any COM object. The QueryInterface method in IUnknown interface allows the client to access the object's identity and move between interfaces. A class factory object is required for every object identified by a given CLSID. A class factory object implements the IClassFactory interface.

0. All ActiveX controls are COM objects. COM objects refer to any object that implements IUnknown interface. ActiveX scripting provides a set of OLE interfaces for a scripting engine and a scripting engine host. All these interfaces inherit from IUnknown. ActiveX Document provides a set of Document object and Document object container interfaces, which inherit from IUnknown interfaces. ActiveX server-side scripting uses OLE technology. 0 is built on COM. COM provides a client/server architecture.

The specification also defines a set of interfaces that will be used by different COM objects. The component in COM also supports the communication establishment between the client and server. This component provides location transparency for the client. In other words, the client does not need to know where the server locates; all these are taken care of by the COM library. COM Library APIs Functions COM library API functions provide the functionality to the COM applications. COM applications are any application that uses COM.

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