Tests/VSWinStorePhone/Direct3DApp1/DirectXHelper.h

#pragma once

#include <wrl/client.h>
#include <ppl.h>
#include <ppltasks.h>

namespace DX
{
  inline void ThrowIfFailed(HRESULT hr)
  {
    if (FAILED(hr))
    {
      // Set a breakpoint on this line to catch Win32 API errors.
      throw Platform::Exception::CreateException(hr);
    }
  }

  // Function that reads from a binary file asynchronously.
  inline Concurrency::task<Platform::Array<byte>^> ReadDataAsync(Platform::String^ filename)
  {
    using namespace Windows::Storage;
    using namespace Concurrency;

    auto folder = Windows::ApplicationModel::Package::Current->InstalledLocation;

    return create_task(folder->GetFileAsync(filename)).then([] (StorageFile^ file)
    {
#if !PHONE
      return FileIO::ReadBufferAsync(file);
#else
      return file->OpenReadAsync();
    }).then([](Streams::IRandomAccessStreamWithContentType^ stream)
    {
      unsigned int bufferSize = static_cast<unsigned int>(stream->Size);
      auto fileBuffer = ref new Streams::Buffer(bufferSize);
      return stream->ReadAsync(fileBuffer, bufferSize, Streams::InputStreamOptions::None);
#endif
    }).then([] (Streams::IBuffer^ fileBuffer) -> Platform::Array<byte>^
    {
      auto fileData = ref new Platform::Array<byte>(fileBuffer->Length);
      Streams::DataReader::FromBuffer(fileBuffer)->ReadBytes(fileData);
      return fileData;
    });
  }
}