How do I call RfcommDeviceService::FromIdAsync from the UI-Thread?

Question

I tried the following, without success. The "result" var is never set

IAsyncOperation<RfcommDeviceService^>^ Foo::getDeviceServiceAsync() {
  return create_async([this]() {
    RfcommDeviceService^ result = nullptr;
    return create_task(m_dispatcher->RunAsync(Windows::UI::Core::CoreDispatcherPriority::Normal, ref new DispatchedHandler([this, &result] {
      create_task(RfcommDeviceService::FromIdAsync(FooDeviceId))
        .then([&result](RfcommDeviceService^ deviceService) {
        result = deviceService;
      });
    }))).then([result]() {
      return result;
    });
  });
}

Answer 1

I don't see where you are running the 2nd task you create.  I believe that is your problem.

---

Jeff Sanders (MSFT)

@jsandersrocks - Windows Store Developer Solutions @WSDevSol
Getting Started With Windows Azure Mobile Services development? Click here
Getting Started With Windows Phone or Store app development? Click here
My Team Blog: Windows Store & Phone Developer Solutions
My Blog: Http Client Protocol Issues (and other fun stuff I support)

Answer 2

Thanks Jeff for your answer. I still have no clue :/

You mean something like this?:

create_task(RfcommDeviceService::FromIdAsync(FooDeviceId))
        .then([&result](RfcommDeviceService^ deviceService) {
        result = deviceService;
      }).get();

Answer 3

No I mean you do a create_task and then run it:

_dispatcher->RunAsync

you need to do that on the next task you create too.

---

Jeff Sanders (MSFT)

@jsandersrocks - Windows Store Developer Solutions @WSDevSol
Getting Started With Windows Azure Mobile Services development? Click here
Getting Started With Windows Phone or Store app development? Click here
My Team Blog: Windows Store & Phone Developer Solutions
My Blog: Http Client Protocol Issues (and other fun stuff I support)