| /* |
| * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #ifndef DLLUTIL_H |
| #define DLLUTIL_H |
| |
| #include <tchar.h> |
| #include <windows.h> |
| |
| /** |
| * Utility class to handle dynamically loadable libraries. |
| * |
| * NOTE: THIS CLASS IS NOT THREAD-SAFE! |
| */ |
| class DllUtil { |
| public: |
| class Exception {}; |
| class LibraryUnavailableException : public Exception {}; |
| class FunctionUnavailableException : public Exception {}; |
| |
| FARPROC GetProcAddress(LPCSTR name); |
| |
| protected: |
| DllUtil(const char * name) : name(name), module(NULL) {} |
| virtual ~DllUtil(); |
| |
| HMODULE GetModule(); |
| |
| template <class FunctionType> class Function { |
| public: |
| Function(DllUtil * dll, LPCSTR name) : |
| dll(dll), name(name), function(NULL) {} |
| |
| inline FunctionType operator () () { |
| if (!function) { |
| function = (FunctionType)dll->GetProcAddress(name); |
| } |
| return function; |
| } |
| |
| private: |
| DllUtil * const dll; |
| LPCSTR name; |
| |
| FunctionType function; |
| }; |
| |
| private: |
| const char * const name; |
| HMODULE module; |
| }; |
| |
| class DwmAPI : public DllUtil { |
| public: |
| // See DWMWINDOWATTRIBUTE enum in dwmapi.h |
| static const DWORD DWMWA_EXTENDED_FRAME_BOUNDS = 9; |
| |
| static HRESULT DwmIsCompositionEnabled(BOOL * pfEnabled); |
| static HRESULT DwmGetWindowAttribute(HWND hwnd, DWORD dwAttribute, |
| PVOID pvAttribute, DWORD cbAttribute); |
| |
| private: |
| static DwmAPI & GetInstance(); |
| DwmAPI(); |
| |
| typedef HRESULT (WINAPI *DwmIsCompositionEnabledType)(BOOL*); |
| Function<DwmIsCompositionEnabledType> DwmIsCompositionEnabledFunction; |
| |
| typedef HRESULT (WINAPI *DwmGetWindowAttributeType)(HWND hwnd, DWORD dwAttribute, |
| PVOID pvAttribute, DWORD cbAttribute); |
| Function<DwmGetWindowAttributeType> DwmGetWindowAttributeFunction; |
| }; |
| |
| #endif // DLLUTIL_H |
| |