1 /* 2 * Copyright (c) 2020 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "rtc_base/win/hstring.h" 12 13 #include <libloaderapi.h> 14 #include <winstring.h> 15 16 namespace { 17 LoadComBaseFunction(const char * function_name)18FARPROC LoadComBaseFunction(const char* function_name) { 19 static HMODULE const handle = 20 ::LoadLibraryExW(L"combase.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32); 21 return handle ? ::GetProcAddress(handle, function_name) : nullptr; 22 } 23 GetWindowsCreateString()24decltype(&::WindowsCreateString) GetWindowsCreateString() { 25 static decltype(&::WindowsCreateString) const function = 26 reinterpret_cast<decltype(&::WindowsCreateString)>( 27 LoadComBaseFunction("WindowsCreateString")); 28 return function; 29 } 30 GetWindowsDeleteString()31decltype(&::WindowsDeleteString) GetWindowsDeleteString() { 32 static decltype(&::WindowsDeleteString) const function = 33 reinterpret_cast<decltype(&::WindowsDeleteString)>( 34 LoadComBaseFunction("WindowsDeleteString")); 35 return function; 36 } 37 38 } // namespace 39 40 namespace webrtc { 41 ResolveCoreWinRTStringDelayload()42bool ResolveCoreWinRTStringDelayload() { 43 return GetWindowsDeleteString() && GetWindowsCreateString(); 44 } 45 CreateHstring(const wchar_t * src,uint32_t len,HSTRING * out_hstr)46HRESULT CreateHstring(const wchar_t* src, uint32_t len, HSTRING* out_hstr) { 47 decltype(&::WindowsCreateString) create_string_func = 48 GetWindowsCreateString(); 49 if (!create_string_func) 50 return E_FAIL; 51 return create_string_func(src, len, out_hstr); 52 } 53 DeleteHstring(HSTRING hstr)54HRESULT DeleteHstring(HSTRING hstr) { 55 decltype(&::WindowsDeleteString) delete_string_func = 56 GetWindowsDeleteString(); 57 if (!delete_string_func) 58 return E_FAIL; 59 return delete_string_func(hstr); 60 } 61 62 } // namespace webrtc 63