June 2001
Intermediate to advanced
620 pages
19h 29m
English
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ADO and COM: Language Independence
Microsoft’s Component Object Model, better known as COM, is a mature technology that offers universal access to components, regardless of the language in which they were programmed. This is the backbone that allows ADO, through OLE DB, to be so versatile. To understand how COM allows ADO to be language-independent, you must first understand what COM is and what it achieves.
COM
COM is technology specification for writing software components that interact through a standard interface. The COM specification is strictly a binary specification. This guarantees that the language in which a COM object is developed has absolutely no importance once the object is compiled, as long as its adheres to the binary specification.
The COM specification sets rules for creating and managing component objects. This specification guarantees that all COM objects are compatible and that they expose a minimal set of interfaces. These interfaces allow COM objects to communicate with each other whether they are on the same machine or supported by networks. Since the COM specification relies on binary compatibility, COM works across heterogeneous networks. In other words, COM objects can run on any machine, even without the Windows operating system.
A particular type of COM implementation is OLE Automation, or simply Automation. Automation is a standard way for COM objects to expose their functionality to software products, development languages, and even scripting languages. ...
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