| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_WIN_SCOPED_COM_INITIALIZER_H_ |
| #define BASE_WIN_SCOPED_COM_INITIALIZER_H_ |
| #pragma once |
| |
| #include "base/basictypes.h" |
| #include "base/logging.h" |
| #include "build/build_config.h" |
| |
| #if defined(OS_WIN) |
| |
| #include <objbase.h> |
| |
| namespace base { |
| namespace win { |
| |
| // Initializes COM in the constructor (STA or MTA), and uninitializes COM in the |
| // destructor. |
| class ScopedCOMInitializer { |
| public: |
| // Enum value provided to initialize the thread as an MTA instead of STA. |
| enum SelectMTA { kMTA }; |
| |
| // Constructor for STA initialization. |
| ScopedCOMInitializer() { |
| Initialize(COINIT_APARTMENTTHREADED); |
| } |
| |
| // Constructor for MTA initialization. |
| explicit ScopedCOMInitializer(SelectMTA mta) { |
| Initialize(COINIT_MULTITHREADED); |
| } |
| |
| ~ScopedCOMInitializer() { |
| #ifndef NDEBUG |
| // Using the windows API directly to avoid dependency on platform_thread. |
| DCHECK_EQ(GetCurrentThreadId(), thread_id_); |
| #endif |
| if (SUCCEEDED(hr_)) |
| CoUninitialize(); |
| } |
| |
| bool succeeded() const { return SUCCEEDED(hr_); } |
| |
| private: |
| void Initialize(COINIT init) { |
| #ifndef NDEBUG |
| thread_id_ = GetCurrentThreadId(); |
| #endif |
| hr_ = CoInitializeEx(NULL, init); |
| } |
| |
| HRESULT hr_; |
| #ifndef NDEBUG |
| // In debug builds we use this variable to catch a potential bug where a |
| // ScopedCOMInitializer instance is deleted on a different thread than it |
| // was initially created on. If that ever happens it can have bad |
| // consequences and the cause can be tricky to track down. |
| DWORD thread_id_; |
| #endif |
| |
| DISALLOW_COPY_AND_ASSIGN(ScopedCOMInitializer); |
| }; |
| |
| } // namespace win |
| } // namespace base |
| |
| #else |
| |
| namespace base { |
| namespace win { |
| |
| // Do-nothing class for other platforms. |
| class ScopedCOMInitializer { |
| public: |
| enum SelectMTA { kMTA }; |
| ScopedCOMInitializer() {} |
| explicit ScopedCOMInitializer(SelectMTA mta) {} |
| ~ScopedCOMInitializer() {} |
| |
| bool succeeded() const { return true; } |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(ScopedCOMInitializer); |
| }; |
| |
| } // namespace win |
| } // namespace base |
| |
| #endif |
| |
| #endif // BASE_WIN_SCOPED_COM_INITIALIZER_H_ |