summaryrefslogtreecommitdiffstats
path: root/tools/shared/windows/registry.cpp
blob: 948ae8e05109c54ea273814d7278c7716319c202 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the qmake application of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtCore/qstringlist.h>
#include "registry_p.h"

QT_BEGIN_NAMESPACE

#ifdef Q_OS_WIN32
/*!
  Returns the path part of a registry key.
  e.g.
      For a key
          "Software\\Microsoft\\VisualStudio\\8.0\\Setup\\VC\\ProductDir"
      it returns
          "Software\\Microsoft\\VisualStudio\\8.0\\Setup\\VC\\"
*/
static QString keyPath(const QString &rKey)
{
    int idx = rKey.lastIndexOf(QLatin1Char('\\'));
    if (idx == -1)
        return QString();
    return rKey.left(idx + 1);
}

/*!
  Returns the name part of a registry key.
  e.g.
      For a key
          "Software\\Microsoft\\VisualStudio\\8.0\\Setup\\VC\\ProductDir"
      it returns
          "ProductDir"
*/
static QString keyName(const QString &rKey)
{
    int idx = rKey.lastIndexOf(QLatin1Char('\\'));
    if (idx == -1)
        return rKey;

    QString res(rKey.mid(idx + 1));
    if (res == QLatin1String("Default") || res == QLatin1String("."))
        res = QString();
    return res;
}
#endif

QString qt_readRegistryKey(HKEY parentHandle, const QString &rSubkey)
{
    QString result;

#ifdef Q_OS_WIN32
    QString rSubkeyName = keyName(rSubkey);
    QString rSubkeyPath = keyPath(rSubkey);

    HKEY handle = 0;
    LONG res = RegOpenKeyEx(parentHandle, (wchar_t*)rSubkeyPath.utf16(), 0, KEY_READ, &handle);

    if (res != ERROR_SUCCESS)
        return QString();

    // get the size and type of the value
    DWORD dataType;
    DWORD dataSize;
    res = RegQueryValueEx(handle, (wchar_t*)rSubkeyName.utf16(), 0, &dataType, 0, &dataSize);
    if (res != ERROR_SUCCESS) {
        RegCloseKey(handle);
        return QString();
    }

    // get the value
    QByteArray data(dataSize, 0);
    res = RegQueryValueEx(handle, (wchar_t*)rSubkeyName.utf16(), 0, 0,
                          reinterpret_cast<unsigned char*>(data.data()), &dataSize);
    if (res != ERROR_SUCCESS) {
        RegCloseKey(handle);
        return QString();
    }

    switch (dataType) {
        case REG_EXPAND_SZ:
        case REG_SZ: {
            result = QString::fromWCharArray(((const wchar_t *)data.constData()));
            break;
        }

        case REG_MULTI_SZ: {
            QStringList l;
            int i = 0;
            for (;;) {
                QString s = QString::fromWCharArray((const wchar_t *)data.constData() + i);
                i += s.length() + 1;

                if (s.isEmpty())
                    break;
                l.append(s);
            }
            result = l.join(QLatin1String(", "));
            break;
        }

        case REG_NONE:
        case REG_BINARY: {
            result = QString::fromWCharArray((const wchar_t *)data.constData(), data.size() / 2);
            break;
        }

        case REG_DWORD_BIG_ENDIAN:
        case REG_DWORD: {
            Q_ASSERT(data.size() == sizeof(int));
            int i;
            memcpy((char*)&i, data.constData(), sizeof(int));
            result = QString::number(i);
            break;
        }

        default:
            qWarning("QSettings: unknown data %u type in windows registry", quint32(dataType));
            break;
    }

    RegCloseKey(handle);
#else
    Q_UNUSED(parentHandle);
    Q_UNUSED(rSubkey)
#endif

    return result;
}

QT_END_NAMESPACE