Windows fonts work

src/WindowsFontData/DXHelper.h

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+//*********************************************************
+//
+// Copyright (c) Microsoft. All rights reserved.
+// This code is licensed under the MIT License (MIT).
+// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
+// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
+// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
+// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
+//
+//*********************************************************
+
+
+#pragma once
+
+#include "stdafx.h"
+
+// THROW_SYSTEM_ERROR is used to differentiate Win32 versus WinRT implementation for the error handling
+// defined here. Define THROW_SYSTEM_ERROR in stdafx.h if this is being used in a Win32 project, but not
+// if it's being used in a WinRT project.
+
+
+namespace DX
+{
+#ifdef THROW_SYSTEM_ERROR // Win32
+    inline std::system_error CreateDXException(HRESULT hr)
+    {
+        return std::system_error(std::error_code(hr, std::system_category()));
+    }
+#else // Throw WinRT exception.
+    inline Platform::Exception^ CreateDXException(HRESULT hr)
+    {
+        return Platform::Exception::CreateException(hr);
+    }
+#endif // THROW_SYSTEM_ERROR
+
+
+    // Convert DirectX error codes to exceptions.
+    inline void ThrowIfFailed(HRESULT hr)
+    {
+        if (FAILED(hr))
+        {
+            // Set a breakpoint on this line to catch Win32 API errors.
+            throw CreateDXException(hr);
+        }
+    }
+
+} // DX namespace