include/systools/win32/oleauto.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #pragma once
  21
  22 #include <cassert>
  23 #include <string_view>
  24 #include <utility>
  25
  26 #include <prewin.h>
  27 #include <oleauto.h>
  28 #include <postwin.h>
  29
  30 #include <o3tl/char16_t2wchar_t.hxx>
  31
  32 namespace sal::systools
  33 {
  34 // BSTR safe wrapper
  35 class BStr
  36 {
  37 public:
  38     BStr() = default;
  39     BStr(std::u16string_view sv)
  40         : m_Str(::SysAllocStringLen(o3tl::toW(sv.data()), sv.length()))
  41     {
  42     }
  43     BStr(const BStr& src)
  44         : BStr(std::u16string_view(src))
  45     {
  46     }
  47     BStr(BStr&& src)
  48         : m_Str(std::exchange(src.m_Str, nullptr))
  49     {
  50     }
  51     ~BStr() { ::SysFreeString(m_Str); }
  52     BStr& operator=(std::u16string_view sv)
  53     {
  54         ::SysFreeString(
  55             std::exchange(m_Str, ::SysAllocStringLen(o3tl::toW(sv.data()), sv.length())));
  56         return *this;
  57     }
  58     BStr& operator=(const BStr& src)
  59     {
  60         if (&src != this)
  61             operator=(std::u16string_view(src));
  62         return *this;
  63     }
  64     BStr& operator=(BStr&& src)
  65     {
  66         ::SysFreeString(std::exchange(m_Str, std::exchange(src.m_Str, nullptr)));
  67         return *this;
  68     }
  69     operator std::u16string_view() const { return { o3tl::toU(m_Str), length() }; }
  70     operator BSTR() const { return m_Str; }
  71     BSTR* operator&()
  72     {
  73         assert(!m_Str);
  74         return &m_Str;
  75     }
  76     UINT length() const { return ::SysStringLen(m_Str); }
  77
  78 private:
  79     BSTR m_Str = nullptr;
  80 };
  81
  82 } // sal::systools
  83
  84 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */