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74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_WIN_SCOPED_HSTRING_H_
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#define BASE_WIN_SCOPED_HSTRING_H_
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#include <hstring.h>
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#include "base/scoped_generic.h"
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#include "base/strings/string_piece_forward.h"
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namespace base {
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namespace internal {
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// Scoped HSTRING class to maintain lifetime of HSTRINGs allocated with
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// WindowsCreateString().
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struct BASE_EXPORT ScopedHStringTraits {
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static HSTRING InvalidValue() { return nullptr; }
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static void Free(HSTRING hstr);
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};
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} // namespace internal
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namespace win {
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// ScopedHString is a wrapper around an HSTRING. Note that it requires certain
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// functions that are only available on Windows 8 and later, and that these
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// functions need to be delayloaded to avoid breaking Chrome on Windows 7.
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//
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// Callers MUST check the return value of ResolveCoreWinRTStringDelayLoad()
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// *before* using ScopedHString.
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//
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// One-time Initialization for ScopedHString:
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//
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// bool success = ScopedHString::ResolveCoreWinRTStringDelayload();
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// if (!success) {
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// // ScopeHString can be used.
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// } else {
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// // Handle error.
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// }
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//
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// Example use:
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//
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// ScopedHString string = ScopedHString::Create(L"abc");
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//
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// Also:
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//
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// HSTRING win_string;
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// HRESULT hr = WindowsCreateString(..., &win_string);
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// ScopedHString string(win_string);
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//
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class BASE_EXPORT ScopedHString
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: public ScopedGeneric<HSTRING, base::internal::ScopedHStringTraits> {
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public:
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// Constructs a ScopedHString from an HSTRING, and takes ownership of |hstr|.
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explicit ScopedHString(HSTRING hstr);
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static ScopedHString Create(StringPiece16 str);
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static ScopedHString Create(StringPiece str);
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// Loads all required HSTRING functions, available from Win8 and onwards.
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static bool ResolveCoreWinRTStringDelayload();
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StringPiece16 Get() const;
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std::string GetAsUTF8() const;
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};
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} // namespace win
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} // namespace base
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#endif // BASE_WIN_SCOPED_HSTRING_H_
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