src/os/windows/library_loader_win.cpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   4  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   5  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   6  */
   7
   8 /** @file library_loader_win.cpp Implementation of the LibraryLoader for Windows */
   9
  10 #include "../../stdafx.h"
  11
  12 #include <windows.h>
  13
  14 #include "../../library_loader.h"
  15 #include "../../3rdparty/fmt/format.h"
  16
  17 #include "../../safeguards.h"
  18
  19 static std::string GetLoadError()
  20 {
  21         auto error_code = GetLastError();
  22
  23         wchar_t buffer[512];
  24         if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, nullptr, error_code,
  25                 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buffer, static_cast<DWORD>(std::size(buffer)), nullptr) == 0) {
  26                 return fmt::format("Unknown error {}", error_code);
  27         }
  28
  29         return FS2OTTD(buffer);
  30 }
  31
  32 void *LibraryLoader::OpenLibrary(const std::string &filename)
  33 {
  34         void *h = ::LoadLibraryW(OTTD2FS(filename).c_str());
  35         if (h == nullptr) {
  36                 this->error = GetLoadError();
  37         }
  38
  39         return h;
  40 }
  41
  42 void LibraryLoader::CloseLibrary()
  43 {
  44         HMODULE handle = static_cast<HMODULE>(this->handle);
  45
  46         ::FreeLibrary(handle);
  47 }
  48
  49 void *LibraryLoader::GetSymbol(const std::string &symbol_name)
  50 {
  51         HMODULE handle = static_cast<HMODULE>(this->handle);
  52
  53         void *p = reinterpret_cast<void *>(::GetProcAddress(handle, symbol_name.c_str()));
  54         if (p == nullptr) {
  55                 this->error = GetLoadError();
  56         }
  57
  58         return p;
  59 }