Bug: co_await apartment_context crashs with ''CoInitialize has not been called.'' about cppwinrt HOT 3 CLOSED

This example program does not initialize the MTA in the process. The background tasks therefore run outside the MTA and the "you didn't initialize COM" error is raised.

The call to foo works around this issue because the implementation of StorageFolder::GetFolderFromPathAsync has a side effect of initializing the MTA in the process.

I think the appropriate fix would be to have your code initialize the MTA before it tries to use it. One way that can be done is by calling CoIncrementMTAUsage. Simply call that before the call to bar and the crash is avoided.

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Thank you.
I had never think apartment is a property of process.
I tested:

std::thread{ []() {
	winrt::init_apartment();
	::Sleep(10000);
} }.detach();

std::thread{ []() {
	auto type = winrt::impl::get_apartment_type();
	printf("%d\n",type.first);
} }.join();

I think once a thread is initialized as MTA. All thread not initialized will be considered as MTA.

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But I find that initialized with single threaded will also make the ContextCallback success.

void test()
{
	winrt::com_ptr<IContextCallback> ctx;
	CoGetObjectContext(IID_IContextCallback, ctx.put_void());
	assert(ctx);

	TrySubmitThreadpoolCallback([](PTP_CALLBACK_INSTANCE pci, PVOID p) {
		
		auto x = winrt::impl::get_apartment_type();
		winrt::com_ptr<IContextCallback> ctx;
		*ctx.put_void() = p;
		winrt::init_apartment(winrt::apartment_type::single_threaded);
		ComCallData data;
		HRESULT hr = ctx->ContextCallback([](ComCallData*) {
			return S_OK;
		}, &data, IID_ICallbackWithNoReentrancyToApplicationSTA, 5, nullptr);
		printf("[%d]hr=%d\n", GetCurrentThreadId(), hr);

	}, ctx.detach(), 0);
}

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