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In Microsoft Windows applications programming, OLE Automation (later renamed to simply Automation [1] [2]) is an inter-process communication mechanism created by Microsoft.It is based on a subset of Component Object Model (COM) that was intended for use by scripting languages – originally Visual Basic – but now is used by several languages on Windows.
IDispatch is the interface that exposes the OLE Automation protocol. [1] Extending IUnknown , it is one of the standard interfaces that can be exposed by COM objects. COM distinguishes between three interface types: custom that are VTABLE-based IUnknown interfaces, dispatch that are IDispatch interfaces supporting introspection, and dual ...
OLE 1.0 later evolved to become an architecture for software components known as the Component Object Model (COM), and later DCOM. When an OLE object is placed on the clipboard or embedded in a document, both a visual representation in native Windows formats (such as a bitmap or metafile ) is stored, as well as the underlying data in its own ...
The OPC specification was based on the OLE, COM, and DCOM technologies developed by Microsoft Corporation for the Microsoft Windows operating system family. The specification defined a standard set of objects, interfaces e.g. IDL and methods for use in process control and manufacturing automation applications to facilitate interoperability.
IOleObject - This is the base interface for Object Linking and Embedding (OLE) objects. IDispatch - This interface provides name-based dynamic method dispatch for OLE Automation COM objects; IObjectWithSite - This COM interface allows a parent/child pair of objects to connect to each other to implement a Browser Helper Object (BHO)
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Component Object Model (COM) is a binary-interface technology for software components from Microsoft that enables using objects in a language-neutral way between different programming languages, programming contexts, processes and machines.