Win32 and WinRT refer to the underlying API (application programming interface) of the Windows operating system. Applications (various software) running on the Windows system pass these system-level interfaces Interact with hardware (such as monitor, keyboard and mouse, etc.).(recommended learning:phpstorm)
Win32 is widely used in Windows 7 and previous systems (including Windows XP). WinRT is a new set of application programming interfaces introduced by Microsoft in Windows 8, allowing developers to use more modern language features to efficiently develop modern-style applications.
Windows 8 and later operating systems (including Windows 10) contain two sets of APIs, Win32 and WinRT.
WinRT (Windows Runtime) is Microsoft's new generation development framework under Win8 Metro. It is a set of object-oriented, cross-language and Native libraries.
WinRT is completely different from traditional Win32 applications. It is directly based on the Windows kernel. It and the Win32 API are two sets of development frameworks in parallel.
Maybe Microsoft tried to design it this way, so it gave us such an architecture diagram, but later we gradually discovered that the actual situation is like this:
WinRT is not directly based on the Windows kernel, but a system-level application built directly on Win32. The lower layer of WinRT is still the Win32 API.
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