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
~DllUtil()33 DllUtil::~DllUtil()
34 {
35 if (module != NULL) {
36 ::FreeLibrary(module);
37 module = NULL;
38 }
39 }
40
GetModule()41 HMODULE DllUtil::GetModule()
42 {
43 if (!module) {
44 module = JDK_LoadSystemLibrary(name);
45 }
46 return module;
47 }
48
GetProcAddress(LPCSTR name)49 FARPROC DllUtil::GetProcAddress(LPCSTR name)
50 {
51 if (GetModule()) {
52 return ::GetProcAddress(GetModule(), name);
53 }
54 throw LibraryUnavailableException();
55 }
56
GetInstance()57 DwmAPI & DwmAPI::GetInstance()
58 {
59 static DwmAPI dll;
60 return dll;
61 }
62
DwmAPI()63 DwmAPI::DwmAPI() :
64 DllUtil("DWMAPI.DLL"),
65 DwmIsCompositionEnabledFunction((DllUtil*)this, "DwmIsCompositionEnabled"),
66 DwmGetWindowAttributeFunction((DllUtil*)this, "DwmGetWindowAttribute")
67 {
68 }
69
DwmIsCompositionEnabled(BOOL * pfEnabled)70 HRESULT DwmAPI::DwmIsCompositionEnabled(BOOL * pfEnabled)
71 {
72 if (GetInstance().DwmIsCompositionEnabledFunction()) {
73 return GetInstance().DwmIsCompositionEnabledFunction()(pfEnabled);
74 }
75 throw FunctionUnavailableException();
76 }
77
DwmGetWindowAttribute(HWND hwnd,DWORD dwAttribute,PVOID pvAttribute,DWORD cbAttribute)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 }
87
88
89