src/Utils/MiscUI/ResString.h

   1 // TortoiseSVN - a Windows shell extension for easy version control
   2
   3 // Copyright (C) 2013, 2015 - TortoiseSVN
   4
   5 // This program is free software; you can redistribute it and/or
   6 // modify it under the terms of the GNU General Public License
   7 // as published by the Free Software Foundation; either version 2
   8 // of the License, or (at your option) any later version.
   9
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program; if not, write to the Free Software Foundation,
  17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 //
  19
  20 #pragma once
  21 #include <string>
  22 #include <memory>
  23
  24 /**
  25  * Loads a string from the application resources.
  26  */
  27 class ResString
  28 {
  29 public:
  30         ResString (HINSTANCE hInstance, int resId)
  31         {
  32                 int bufsize = 1024;
  33                 str.clear();
  34                 do
  35                 {
  36                         auto buf = std::make_unique<wchar_t[]>(bufsize);
  37                         int ret = ::LoadString(hInstance, resId, buf.get(), bufsize);
  38                         if (ret == (bufsize-1))
  39                                 bufsize *= 2;
  40                         else
  41                                 str = buf.get();
  42                 } while (str.empty());
  43         }
  44         operator TCHAR const * () const { return str.c_str(); }
  45         operator std::wstring () const { return str; }
  46 private:
  47         std::wstring str;
  48 };
  49