1/* 2 * Copyright (C) 2009 Apple Inc. All Rights Reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include <windows.h> 27 28#if _WIN32_WINNT_WINBLUE 29#include <versionhelpers.h> 30#endif 31 32namespace rx { 33 34#ifndef _WIN32_WINNT_WINBLUE 35static bool IsWindowsVistaOrGreater() 36{ 37 OSVERSIONINFOEXW osvi = { }; 38 osvi.dwOSVersionInfoSize = sizeof(osvi); 39 osvi.dwMajorVersion = HIBYTE(_WIN32_WINNT_VISTA); 40 osvi.dwMinorVersion = LOBYTE(_WIN32_WINNT_VISTA); 41 DWORDLONG condition = 0; 42 VER_SET_CONDITION(condition, VER_MAJORVERSION, VER_GREATER_EQUAL); 43 VER_SET_CONDITION(condition, VER_MINORVERSION, VER_GREATER_EQUAL); 44 return !!::VerifyVersionInfoW(&osvi, VER_MAJORVERSION | VER_MINORVERSION, condition); 45} 46#endif 47 48bool isWindowsVistaOrGreater() 49{ 50 static bool initialized = false; 51 static bool cachedIsWindowsVistaOrGreater; 52 53 if (!initialized) { 54 initialized = true; 55 cachedIsWindowsVistaOrGreater = IsWindowsVistaOrGreater(); 56 } 57 return cachedIsWindowsVistaOrGreater; 58} 59 60} // namespace rx 61