RCWs bridge the managed, garbage-collected world with the native, ref-counted world. This is a special kind of object called a “ Runtime Callable Wrapper” or RCW. The Common Language Runtime, CLR or just the “Runtime”, can make a COM object look just like a regular managed object.
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(If you already know how COM Interop works, you can skip the following two sections.) Calling COM objects from Managed code Managed classes can implement COM interfaces so that they may be called as COM objects from either native or managed code.Managed code can make calls through a COM interface just as if they were a regular method calls.Briefly, this allows two things to happen: Managed code and COM are brought together through the magic of COM Interop.
In the case of the new editor, it so happens that we introduced a new, managed programming model for new extensions, but even so, we had to keep the existing COM interfaces for older extensions. you don’t need to know implementation details in order to communicate with a component via its interface. Indeed, that’s the promise of interface based programming – i.e. Moving to managed code doesn’t change how these extensions communicate with platform components. In Visual Studio 2010, each was rewritten in managed code using C#.Įxtensions which plug into Visual Studio communicate with these components through COM interfaces. In previous versions of Visual Studio, these were native components written in C++. Specifically, the window manager, the command bars and the text editor. What changed?Īs I mentioned in the Background, we rewrote several components for Visual Studio 2010. It’s not essential to understand every detail but the lesson we learned here may be valuable for others working with large “legacy” code bases.
This is a rather lengthy technical discussion and I apologize in advance for its dryness. In this post I’ll describe the problem and what we did to solve it. This post describes a problem we encountered and solved during the development of Visual Studio 2010 when we rewrote some components in managed code.
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