RakNet/Samples/WinPhone8/DirectXHelper.h

/*
 *  Copyright (c) 2014, Oculus VR, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant 
 *  of patent rights can be found in the PATENTS file in the same directory.
 *
 */

#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) 
		{
			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);
		}).then([] (Streams::IBuffer^ fileBuffer) -> Platform::Array<byte>^ 
		{
			auto fileData = ref new Platform::Array<byte>(fileBuffer->Length);
			Streams::DataReader::FromBuffer(fileBuffer)->ReadBytes(fileData);
			return fileData;
		});
	}
}