scoped_winrt_initializer.cc 2.4 KB

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  1. // Copyright 2017 The Chromium Authors. All rights reserved.
  2. // Use of this source code is governed by a BSD-style license that can be
  3. // found in the LICENSE file.
  4. #include "base/win/scoped_winrt_initializer.h"
  5. #include <roapi.h>
  6. #include <windows.h>
  7. #include "base/check_op.h"
  8. #include "base/threading/scoped_thread_priority.h"
  9. #include "base/win/com_init_util.h"
  10. #include "base/win/core_winrt_util.h"
  11. #include "base/win/windows_version.h"
  12. namespace base {
  13. namespace win {
  14. namespace {
  15. FARPROC LoadComBaseFunction(const char* function_name) {
  16. static HMODULE const handle = []() {
  17. // Mitigate the issues caused by loading DLLs on a background thread
  18. // (http://crbug/973868).
  19. SCOPED_MAY_LOAD_LIBRARY_AT_BACKGROUND_PRIORITY();
  20. return ::LoadLibraryEx(L"combase.dll", nullptr,
  21. LOAD_LIBRARY_SEARCH_SYSTEM32);
  22. }();
  23. return handle ? ::GetProcAddress(handle, function_name) : nullptr;
  24. }
  25. decltype(&::RoInitialize) GetRoInitializeFunction() {
  26. static decltype(&::RoInitialize) const function =
  27. reinterpret_cast<decltype(&::RoInitialize)>(
  28. LoadComBaseFunction("RoInitialize"));
  29. return function;
  30. }
  31. decltype(&::RoUninitialize) GetRoUninitializeFunction() {
  32. static decltype(&::RoUninitialize) const function =
  33. reinterpret_cast<decltype(&::RoUninitialize)>(
  34. LoadComBaseFunction("RoUninitialize"));
  35. return function;
  36. }
  37. HRESULT CallRoInitialize(RO_INIT_TYPE init_type) {
  38. auto ro_initialize_func = GetRoInitializeFunction();
  39. if (!ro_initialize_func)
  40. return E_FAIL;
  41. return ro_initialize_func(init_type);
  42. }
  43. void CallRoUninitialize() {
  44. auto ro_uninitialize_func = GetRoUninitializeFunction();
  45. if (ro_uninitialize_func)
  46. ro_uninitialize_func();
  47. }
  48. } // namespace
  49. ScopedWinrtInitializer::ScopedWinrtInitializer()
  50. : hr_(CallRoInitialize(RO_INIT_MULTITHREADED)) {
  51. DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  52. DCHECK_GE(GetVersion(), Version::WIN8);
  53. #if DCHECK_IS_ON()
  54. if (SUCCEEDED(hr_))
  55. AssertComApartmentType(ComApartmentType::MTA);
  56. else
  57. DCHECK_NE(RPC_E_CHANGED_MODE, hr_) << "Invalid COM thread model change";
  58. #endif
  59. }
  60. ScopedWinrtInitializer::~ScopedWinrtInitializer() {
  61. DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  62. if (SUCCEEDED(hr_))
  63. CallRoUninitialize();
  64. }
  65. bool ScopedWinrtInitializer::Succeeded() const {
  66. return SUCCEEDED(hr_);
  67. }
  68. } // namespace win
  69. } // namespace base