| 1 | /*++ |
| 2 | |
| 3 | Copyright (c) Microsoft. All rights reserved. |
| 4 | |
| 5 | Module Name: |
| 6 | |
| 7 | Helpers.h |
| 8 | |
| 9 | Abstract: |
| 10 | |
| 11 | This file contains helpers for the WinRT wrapper of WSLC SDK. |
| 12 | |
| 13 | --*/ |
| 14 | |
| 15 | #pragma once |
| 16 | |
| 17 | #define THROW_MSG_IF_FAILED(hr, msg) \ |
| 18 | do \ |
| 19 | { \ |
| 20 | const auto _hr = (hr); \ |
| 21 | if (FAILED(_hr)) \ |
| 22 | { \ |
| 23 | auto _msg = (msg).get(); \ |
| 24 | if (_msg) \ |
| 25 | { \ |
| 26 | throw winrt::hresult_error(_hr, winrt::to_hstring(_msg)); \ |
| 27 | } \ |
| 28 | else \ |
| 29 | { \ |
| 30 | winrt::throw_hresult(_hr); \ |
| 31 | } \ |
| 32 | } \ |
| 33 | } while (0) |
| 34 | |
| 35 | template <typename T> |
| 36 | struct implementation_type; |
| 37 | |
| 38 | #define DEFINE_TYPE_HELPERS(__type__) \ |
| 39 | template <> \ |
| 40 | struct implementation_type<winrt::Microsoft::WSL::Containers::__type__> \ |
| 41 | { \ |
| 42 | using type = winrt::Microsoft::WSL::Containers::implementation::__type__; \ |
| 43 | }; |
| 44 | |
| 45 | namespace winrt::Microsoft::WSL::Containers::implementation { |
| 46 | template <typename T> |
| 47 | auto GetImplementation(const T& obj) |
| 48 | { |
| 49 | return winrt::get_self<typename implementation_type<T>::type>(obj); |
| 50 | } |
| 51 | |
| 52 | template <typename T> |
| 53 | auto* GetStructPointer(const T& obj) |
| 54 | { |
| 55 | return obj ? GetImplementation(obj)->ToStructPointer() : nullptr; |
| 56 | } |
| 57 | |
| 58 | template <typename T> |
| 59 | auto GetStruct(const T& obj) |
| 60 | { |
| 61 | return GetImplementation(obj)->ToStruct(); |
| 62 | } |
| 63 | |
| 64 | template <typename T> |
| 65 | auto GetHandle(const T& obj) |
| 66 | { |
| 67 | return obj ? GetImplementation(obj)->ToHandle() : nullptr; |
| 68 | } |
| 69 | |
| 70 | template <typename T> |
| 71 | auto* GetStructPointer(const winrt::com_ptr<T>& obj) |
| 72 | { |
| 73 | return obj ? obj->ToStructPointer() : nullptr; |
| 74 | } |
| 75 | |
| 76 | // Helper for forwarding C progress callbacks to a WinRT progress token. |
| 77 | // An instance of this struct is used as the context for the C callback. |
| 78 | // The callback is invoked synchronously during the blocking C call, so the context |
| 79 | // lives on the coroutine stack and is always valid for the duration of the call. |
| 80 | template <typename T> |
| 81 | struct ProgressCallbackHelper |
| 82 | { |
| 83 | template <typename ProgressTokenT> |
| 84 | ProgressCallbackHelper(ProgressTokenT progressToken) : |
| 85 | m_reportProgress([progressToken](T progress) { progressToken(progress); }) |
| 86 | { |
| 87 | } |
| 88 | |
| 89 | static void ReportProgress(PVOID context, T progress) |
| 90 | { |
| 91 | auto callbackContext = static_cast<ProgressCallbackHelper*>(context); |
| 92 | callbackContext->m_reportProgress(progress); |
| 93 | } |
| 94 | |
| 95 | const std::function<void(T)> m_reportProgress; |
| 96 | }; |
| 97 | } // namespace winrt::Microsoft::WSL::Containers::implementation |