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A '''Runtime Callable Wrapper''' (RCW) is a [[proxy pattern|proxy]] object generated by the [[.NET Framework|.NET]] [[Common Language Runtime]] (CLR) in order to allow a [[Component Object Model]] (COM) object to be accessed from managed code. Although the RCW appears to be an ordinary object to .NET clients, its primary function is to [[Marshalling (computer science)|marshal]] calls and data between a .NET client and a COM object.<ref>{{Cite web |last=jkoritzinsky |date=2023-04-19 |title=Runtime Callable Wrapper - .NET |url=https://learn.microsoft.com/en-us/dotnet/standard/native-interop/runtime-callable-wrapper |access-date=2023-12-18 |website=learn.microsoft.com |language=en-us}}</ref>

For example, a managed application written in [[C Sharp (programming language)|C#]] might make use of an existing COM library written in [[C++]] or [[Visual Basic 6]], via RCWs.

The runtime creates exactly one RCW for each COM object, regardless of the number of references that exist on that object. The runtime maintains a single RCW per process for each object. If you create an RCW in one application domain or apartment, and then pass a reference to another application domain or apartment, a proxy to the first object will be used.

== References ==
<references />

==External links==
*[http://msdn2.microsoft.com/en-us/library/8bwh56xe.aspx MSDN Runtime Callable Wrapper Reference]

[[Category:Component-based software engineering]]
[[Category:Inter-process communication]]
[[Category:Microsoft application programming interfaces]]
[[Category:Object-oriented programming]]
[[Category:Object models]]

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Runtime Callable Wrapper - Revision history

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