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Topic: Component Object Model

Related Topics

OCX

IUnknown

Software componentry

Distributed component object model

Object linking and embedding

Visual Basic

DCOM

Component

VBX

Dynamic data exchange

XPCOM

OLE for process control

Thread (computer science)

C Sharp programming language

Globally Unique Identifier

	Component Object Model - Wikipedia, the free encyclopedia
		COM is also ideal for script control of applications such as Office or Internet Explorer since it provides an interface for calling COM object methods from a script rather than requiring knowing the API at compile time.
		COM programmers are responsible for entering and leaving the COM environment, instantiating and reference counting COM objects, querying objects for version information, coding to take advantage of advanced object versions, and coding graceful degradation of function when newer versions aren't available.
		COM objects may be instantiated and referenced from within a process, across process boundaries within a computer, and across a network, using the DCOM technology.
	en.wikipedia.org /wiki/Component_Object_Model (4288 words)

	OLE Component Object Model
		The Component Object Model is polymorphic in the sense that what appears to be the same request can be sent to any interface supporting the requested operation; the interfaces need not refer to objects of the same class.
		Object references (pointers) in Windows Objects are not references to the object itself, as in C++, but rather are pointers to one of the object's interfaces.
		In the Component Object Model, inheritance is simply considered as a language-specific tool (e.g., in C++) that may be useful for implementing classes and defining interfaces in that language.
	www.objs.com /x3h7/ole2.htm (4073 words)

	Component Object Model Specification, Part I: Component Object M... (Site not responding. Last check: 2007-07-11)
		COM is not a prescribed way to structure an application; rather, it is a set of technologies for building robust groups of services in both systems and applications such that the services and the clients of those services can evolve over time.
		COM explicitly bars certain kinds of "features"--such as direct access to object data, properties, or variables--that might be convenient in the case of in-process objects but would make it impossible for an out-of-process object to provide the same set of services.
		COM is able to load and run the server code, ask the sever to create an object of the class, and connect that new object to the client.
	www.graphcomp.com /info/specs/com/comch01.htm (13029 words)

	The Component Object Model
		Objects in one process could not communicate with objects in another process using their own defined methods.
		COM forces the OS to act as a central registry for objects.
		Even though COM objects reside in separate processes or address spaces or even different machines, the operating system takes care of marshalling the call and calling objects running in a different application (or address space) on a different machine.
	my.execpc.com /~gopalan/com/com_ravings.html (511 words)

	Component object model (Site not responding. Last check: 2007-07-11)
		Component Object Model (COM) is a Microsoft technology for software components also known as ActiveX.
		There exists a limited backward compatibility in a COM object may be used in by implementing a runtime callable wrapper (RCW) and.NET may use COM by calling a COM callable wrapper.
		COM interfaces have bindings in several languages such as C C++ Visual Basic and several of the scripting languages on the Windows platform.
	www.freeglossary.com /ActiveX (1089 words)

	The Component Object Model Specification
		COM explicitly bars certain kinds of "features"—such as direct access to object data, properties, or variables—that might be convenient in the case of in-process objects but would make it impossible for an out-of-process object to provide the same set of services.
		Objects which have the same set of interfaces and the same implementations for each are often said (loosely) to be instances of the same class because they generally implement those interfaces in a certain way.
		COM objects, which are dynamically allocated, must allow the client to decide when the object is no longer in use, especially for local or remote objects that may be in use by multiple clients at the same time—the object must wait until all clients are finished with it before freeing itself.
	www.daimi.au.dk /~datpete/COT/COM_SPEC/html/com_spec.html (16916 words)

	Component Object Model (Site not responding. Last check: 2007-07-11)
		COM communication is done via interfaces or groups of functions implemented by COM objects.
		This model is based on the C++ abstract class: like an abstract base class, the interface definition defines a layout for the table of function pointers (the v-table) and derived classes (the COM objects) provide implementations.
		COM Objects can be in-process, in which case they are implemented as DLLs and loaded into the calling application's address space.
	www.gdcl.co.uk /com.htm (279 words)

	COM (Component Object Model) (Linktionary term)
		COM (Component Object Model) is a Microsoft specification that defines the interaction between components in the Windows environment.
		COM was introduced in 1993, and its first major implementation was in Windows 95, although it is the basis of OLE (Object Linking and Embedding), which is an object-based service that allows applications running in the same computer to interact and share information.
		DCOM (Distributed Component Object Model) is the network version of COM that allows objects running in different computers attached to a network to interact.
	www.linktionary.com /c/com.html (418 words)

	Component Object Model (COM)
		COM introduces the concept of apartments to allow objects with different concurrency constraints to live in the same process.
		When the object reference is shipped to the client side, the client-side COM infrastructure unmarshals it by extracting the connection information, making the connection, and returning an interface pointer to the client.
		Alternatively, since these objects are themselves COM objects that are dynamically created during the unmarshaling process, indirection can also be supported by either specifying different CLSIDs or changing the CLSID to filename mapping.
	research.microsoft.com /~ymwang/papers/HTML/COMEssay/S.htm (3153 words)

	Define Component Object Model - a definition from Whatis.com
		Component Object Model (COM) is Microsoft's framework for developing and supporting program component objects.
		It is aimed at providing similar capabilities to those defined in the Common Object Request Broker Architecture (CORBA), a framework for the interoperation of distributed objects in a network that is supported by other major companies in the computer industry.
		COM includes COM+, Distributed Component Object Model (DCOM), and ActiveX interfaces and programming tools.
	searchwinit.techtarget.com /sDefinition/0,,sid1_gci211823,00.html (183 words)

	Define Component Object Model - a definition from Whatis.com
		Microsoft's TechNet site provides more information for developers about the Component Object Model.
		SearchVB.com, a portal for Visual Basic developers, includes a collection of links about COM.
		SearchWin2000.com has a collection of Internet links related to Component Object Model.
	whatis.techtarget.com /definition/0,289893,sid9_gci211823,00.html (178 words)

	Component Object Model (COM), DCOM, and Related Capabilities (Site not responding. Last check: 2007-07-11)
		Component Object Model (COM), DCOM, and Related Capabilities
		Please proceed to the Component Object Model (COM), DCOM, and Related Capabilities Technology Description.
		If you are unable to install a frames-capable browser and would like a print version of the Software Technology Roadmap, please send your request, including your full mailing address, to str@sei.cmu.edu
	www.sei.cmu.edu /str/descriptions/com.html (77 words)

	Distributed Component Object Model
		(DCOM) Microsoft's extension of their Component Object Model (COM) to support objects distributed across a network.
		DCOM has been submitted to the IETF as a draft standard.
		DCOM is broken because it's an object model that has no provisions for inheritance, one of the major reasons for object oriented programming in the first place.
	burks.bton.ac.uk /burks/foldoc/85/32.htm (126 words)

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