CreateDispatcherQueueController.cpp

#include <winrt/Windows.System.h>
#include <ShellScalingAPI.h>
#include <DispatcherQueue.h>

using namespace std::literals;
using namespace winrt;
using namespace Windows::Foundation;
using namespace Windows::System;

auto CreateDispatcherQueueController()
{
    namespace abi = ABI::Windows::System;

    DispatcherQueueOptions options
    {
        sizeof(DispatcherQueueOptions),
        DQTYPE_THREAD_CURRENT,
        DQTAT_COM_STA
    };

    DispatcherQueueController controller{ nullptr };
    check_hresult(CreateDispatcherQueueController(options, reinterpret_cast<abi::IDispatcherQueueController**>(put_abi(controller))));
    return controller;
}

IAsyncAction Async(DispatcherQueue queue)
{
    while (true)
    {
        co_await 2s;

        queue.TryEnqueue([]
        {
            puts("handler");
        });
    }
}

int main()
{
    init_apartment(apartment_type::single_threaded);
    auto controller = CreateDispatcherQueueController();
    Async(controller.DispatcherQueue());
    MSG message;

    while (GetMessage(&message, nullptr, 0, 0))
    {
        DispatchMessage(&message);
    }
}