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I’m personally extremely impressed and excited by it having worked with it for a little while now.
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There’s much more than can be said about Windows 8.
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So while you don’t need to write any special code for WinRT interop, Desktop interop (P/Invoke and COM interop) will remain relevant and useful well into the future both for working with legacy code and for creating new Desktop style apps for Windows 8. NET applications and libraries will continue to be an important part of Windows for many years to come. Metro style apps are only a good fit for some types of applications, and Win32, classic COM, WPF, Silverlight, and.
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Users of previous version of Windows will instantly recognize it, and Windows 8 seamlessly transitions between the two interfaces when you switch between Metro and Desktop applications.
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The Desktop-style interface in Windows 8 (the other mode) is designed to be an incremental improvement upon Windows 7 both in terms of design and display. Surprisingly, this does not have much impact on the concepts examined in the remainder of this article, largely because WinRT is used only for Metro style apps. The CLR knows all about this and takes care of all of the reference counting for you when you use a native (non-CLR) WinRT component. When the count reaches zero, the object is destroyed right then and there (this is what’s referred to as “deterministic destruction”, since you know exactly when it will happen). When something else references it, it goes up by one, and when that reference is released, it goes down by one. When you create an object, the count starts at one. WinRT natively uses reference counting to handle object life spans, which is where an internal count of the number of references to an object is maintained.
NET Framework itself.įrom a memory management perspective, WinRT interop is primarily between different models of automatic memory management: reference counting (COM) and mark-and-sweep (.NET). winmd extension) are consumed and the publicly exposed members are available just as if they were part of the. When using WinRT components, the CLR takes care of everything internally, regardless of whether it is native or. Interop in WinRT is designed to just work (see ). NET to use WinRT – That’s where the “friendlier” and “better” parts come in. Now don’t be scared! You don’t need to learn COM or abandon. At its core, WinRT is a friendlier, better. Windows 8 introduces a new interface to the operating system called Windows Runtime (WinRT) iIt is the interface for writing Metro-style games and apps. NET without needing to rewrite existing code that your projects depend on. With it, you can take advantage of the speed and ease of. Interop code of either sort lets you access functionality in existing native and COM libraries that is not exposed by the. I also recommend searching around for materials about creating Microsoft Office add-ins using C# and VB since that’s a very rich source of COM interop information. If you need to dive deep into COM interop, the MSDN documentation is one of the best sources of information there is. differences in error handling mechanisms – see ). This article is primarily about the memory aspects of interop so there are many aspects of COM interop that we’ll only briefly touch on and quite a few that we won’t see at all (e.g.
COM has a long history and there are many components out there that use it. The other type of interop is COM interop, which Visual Studio actually provides many tools to make easy. Considering the magical things it does, it is often surprisingly easy to implement P/Invoke in order to call some specific bit of native functionality that your application needs. You will most commonly use it to access C-style functions in Win32 DLLs, and C and C++ code in in-house and 3rd party libraries. P/Invoke is one of the two types of interop you will come across as a developer. Windows Forms, for example, is primarily a P/Invoke-based wrapper around ComCtl32.dll. NET Framework on Windows are implemented as platform invoke (P/Invoke) interop with native Windows DLLs. But there’s really nothing to fear from interoperability between managed and unmanaged code, especially if you learn a bit about what’s going on under the hood when you write interop code.
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The term alone can inspire fear, confusion, and uncertainty in many software developers. 5 Tips for Understanding Managed-Unmanaged Interoperability in.