New Post: Getting an exception when trying to close file stream on win8/RT

I'm working on a basic downloader based on the http client tutorial. I've tried to match it as closely as possible, with the exception of the open_ostream call which takes a Windows::Storage::StorageFile instead of a path string. It does the download and save to file correctly, but when I try to close the file stream it throws an exception because fileInfo is NULL in _close_file in filestream.h.

auto fileStream = std::make_shared<ostream>();

Windows::Storage::StorageFolder^ storageRoot = Windows::Storage::ApplicationData::Current->TemporaryFolder;

    pplx::task<void> createFileTask = create_task(storageRoot->CreateFileAsync(fileName_w, Windows::Storage::CreationCollisionOption::ReplaceExisting))
        .then([=](Windows::Storage::StorageFile^ storageFile)
    {
        return fstream::open_ostream(storageFile);
    }).then([=](ostream outFile)
    {
        *fileStream = outFile;

        web::http::client::http_client client(url_u);

        return client.request(web::http::methods::GET);
    }).then([=](web::http::http_response response)
    {
        m_lastStatusCode = response.status_code();

        return response.body().read_to_end(fileStream->streambuf());
    }).then([=](size_t)
    {
        return fileStream->close(); // breaks here
    });

    try
    {
        createFileTask.wait();
    }
    catch (const std::exception &e)
    {
        printf("Error exception:%s\n", e.what());
    }