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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the qmake application of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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, unsigned long options)
{
QString result;
#ifdef Q_OS_WIN32
QString rSubkeyName = keyName(rSubkey);
QString rSubkeyPath = keyPath(rSubkey);
HKEY handle = nullptr;
LONG res = RegOpenKeyEx(parentHandle, (wchar_t*)rSubkeyPath.utf16(), 0,
KEY_READ | options, &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(), nullptr, &dataType, nullptr, &dataSize);
if (res != ERROR_SUCCESS) {
RegCloseKey(handle);
return QString();
}
// get the value
QByteArray data(dataSize, 0);
res = RegQueryValueEx(handle, (wchar_t*)rSubkeyName.utf16(), nullptr, nullptr,
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)
Q_UNUSED(options);
#endif
return result;
}
QT_END_NAMESPACE
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