نماذج مايكروسوفت. Component Object Model

Networked DCOM uses binary , while WCF encourages the use of -based messaging Each COM component exposes its functionality through one or more
Process isolation limits state corruption in one process from negatively affecting the integrity of the other processes, since they only communicate through strictly defined interfaces In addition to custom interfaces, COM also supports dispatch interfaces inheriting from

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The choice of apartment for COM objects and threads are determined at run-time, and cannot be changed.

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This can be useful for decoupling subsystems of large application into separate processes
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With this were added necessary features for configuring which users have authority to create, activate and call objects, for identifying the calling user, as well as specifying required encryption for security of calls
كيفية إنشاء استبيان في نماذج مايكروسوفت
Process and network transparency [ ] COM objects can be transparently instantiated and referenced from within the same process in-process , across process boundaries out-of-process , or remotely over the network DCOM
When an STA or MTA thread calls an NA object in the same process, then the calling thread temporarily leaves its apartment and executes code directly in the NA without any thread switching IBM System Object Model, feature-rich alternative to COM• The design of an application must take this into account so that objects are not left orphaned
Text conversations and Windows messages had proved not to be flexible enough to allow sharing application features in a robust and extensible way, so COM was created as a new foundation, and OLE changed to OLE2 NET [ ] Main article: Microsoft

Component Object Model

[ ] COM replaced as the preferred form of interprocess communication.

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A COM object may be used in
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From both the COM and
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A VBX is a packaged extension in the form of a DLL that allows objects to be graphically placed in a form and manipulated by and
Microsoft recognized the problem with ActiveX as far back as 1996 when Charles Fitzgerald said, "We never made the claim up front that ActiveX is intrinsically secure" Recent [ ] versions of Internet Explorer prompt the user before installing ActiveX controls, enabling the user to disallow installation of controls from sites that the user does not trust
Each apartment represents one mechanism whereby an object's internal state may be synchronized across multiple threads between different interfaces of an object is achieved through the QueryInterface method

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Reference cycles are typically broken using either out-of-band termination or split identities.

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provide automatic reference counting so that COM object developers need not explicitly maintain any internal reference counter in their source codes
Component Object Model
Message pumping [ ] When an STA is initialized it creates a hidden window that is used for inter-apartment and inter-process message routing
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built upon COM: , , , , , , , , , Domain Component Interfacing Abbreviation COM Website Component Object Model COM is a standard for introduced by in 1993