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Showing content from https://learn.microsoft.com/en-us/uwp/cpp-ref-for-winrt/get-class-name below:

winrt::get_class_name function (C++/WinRT) - Windows UWP applications

A helper function that retrieves a string containing the fully-qualified type name of the Windows Runtime class represented by an object of a given projected type. This is the same value returned from a call to IInspectable::GetRuntimeClassName.

This is a free function that retrieves the runtime class name of any arbitrary IInspectable. For the automatically-generated member function that's available only on implementation types, see GetRuntimeClassName. For an explanation of the implementation type and projected type concepts, see Consume APIs with C++/WinRT and Author APIs with C++/WinRT.

Syntax

inline winrt::hstring get_class_name(winrt::Windows::Foundation::IInspectable const& object);

Parameters

object An instance of the projected type for a Windows Runtime class (any runtime class; whether it's a Windows type, or a second- or third-party type).

Return value

A winrt::hstring containing the fully-qualified type name of the Windows Runtime class represented by object. Note that the type of the Windows Runtime class is returned, not that of the projected type. In the example below, the C++/WinRT projected type is winrt::Windows::Foundation::Uri, but the value returned from winrt::get_class_name is "Windows.Foundation.Uri", which is the type name of the runtime class.

Example

winrt::Windows::Foundation::Uri contosoUri{ L"https://www.contoso.com" };
winrt::hstring name = winrt::get_class_name(contosoUri);
assert(name == L"Windows.Foundation.Uri");

Requirements

Minimum supported SDK: Windows SDK version 10.0.17134.0 (Windows 10, version 1803)

Namespace: winrt

Header: %WindowsSdkDir%Include<WindowsTargetPlatformVersion>\cppwinrt\winrt\base.h (included by default)