1 /* 2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 27 #include "DllUtil.h" 28 #include <jdk_util.h> 29 30 // Disable warning about using this in the initializer list. 31 #pragma warning( disable : 4355) 32 33 DllUtil::~DllUtil() 34 { 35 if (module != NULL) { 36 ::FreeLibrary(module); 37 module = NULL; 38 } 39 } 40 41 HMODULE DllUtil::GetModule() 42 { 43 if (!module) { 44 module = JDK_LoadSystemLibrary(name); 45 } 46 return module; 47 } 48 49 FARPROC DllUtil::GetProcAddress(LPCSTR name) 50 { 51 if (GetModule()) { 52 return ::GetProcAddress(GetModule(), name); 53 } 54 throw LibraryUnavailableException(); 55 } 56 57 DwmAPI & DwmAPI::GetInstance() 58 { 59 static DwmAPI dll; 60 return dll; 61 } 62 63 DwmAPI::DwmAPI() : 64 DllUtil("DWMAPI.DLL"), 65 DwmIsCompositionEnabledFunction((DllUtil*)this, "DwmIsCompositionEnabled"), 66 DwmGetWindowAttributeFunction((DllUtil*)this, "DwmGetWindowAttribute") 67 { 68 } 69 70 HRESULT DwmAPI::DwmIsCompositionEnabled(BOOL * pfEnabled) 71 { 72 if (GetInstance().DwmIsCompositionEnabledFunction()) { 73 return GetInstance().DwmIsCompositionEnabledFunction()(pfEnabled); 74 } 75 throw FunctionUnavailableException(); 76 } 77 78 HRESULT DwmAPI::DwmGetWindowAttribute(HWND hwnd, DWORD dwAttribute, 79 PVOID pvAttribute, DWORD cbAttribute) 80 { 81 if (GetInstance().DwmGetWindowAttributeFunction()) { 82 return GetInstance().DwmGetWindowAttributeFunction()(hwnd, dwAttribute, 83 pvAttribute, cbAttribute); 84 } 85 throw FunctionUnavailableException(); 86 }