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// 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_
#include <objbase.h>
#include "base/base_export.h"
#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "base/win/scoped_windows_thread_environment.h"
namespace base {
namespace win {
// Initializes COM in the constructor (STA or MTA), and uninitializes COM in the
// destructor.
//
// WARNING: This should only be used once per thread, ideally scoped to a
// similar lifetime as the thread itself. You should not be using this in
// random utility functions that make COM calls -- instead ensure these
// functions are running on a COM-supporting thread!
class BASE_EXPORT ScopedCOMInitializer : public ScopedWindowsThreadEnvironment {
public:
// Enum value provided to initialize the thread as an MTA instead of STA.
enum SelectMTA { kMTA };
// Constructor for STA initialization.
ScopedCOMInitializer();
// Constructor for MTA initialization.
explicit ScopedCOMInitializer(SelectMTA mta);
~ScopedCOMInitializer() override;
// ScopedWindowsThreadEnvironment:
bool Succeeded() const override;
private:
void Initialize(COINIT init);
HRESULT hr_;
THREAD_CHECKER(thread_checker_);
DISALLOW_COPY_AND_ASSIGN(ScopedCOMInitializer);
};
} // namespace win
} // namespace base
#endif // BASE_WIN_SCOPED_COM_INITIALIZER_H_
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