133 lines
3.7 KiB
C++
133 lines
3.7 KiB
C++
// Copyright (C) 2019 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
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#include "qwinregistry_p.h"
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#include <QtCore/qvarlengtharray.h>
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#include <QtCore/qendian.h>
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#include <QtCore/qlist.h>
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QT_BEGIN_NAMESPACE
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QWinRegistryKey::QWinRegistryKey()
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{
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}
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// Open a key with the specified permissions (KEY_READ/KEY_WRITE).
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// "access" is to explicitly use the 32- or 64-bit branch.
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QWinRegistryKey::QWinRegistryKey(HKEY parentHandle, QStringView subKey,
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REGSAM permissions, REGSAM access)
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{
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if (RegOpenKeyExW(parentHandle, reinterpret_cast<const wchar_t *>(subKey.utf16()),
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0, permissions | access, &m_key) != ERROR_SUCCESS) {
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m_key = nullptr;
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}
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}
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QWinRegistryKey::~QWinRegistryKey()
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{
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close();
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}
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void QWinRegistryKey::close()
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{
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if (isValid()) {
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RegCloseKey(m_key);
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m_key = nullptr;
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}
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}
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QVariant QWinRegistryKey::value(QStringView subKey) const
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{
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Q_ASSERT(!subKey.isEmpty());
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if (!isValid())
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return {};
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auto subKeyC = reinterpret_cast<const wchar_t *>(subKey.utf16());
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// Get the size and type of the value.
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DWORD dataType = REG_NONE;
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DWORD dataSize = 0;
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LONG ret = RegQueryValueExW(m_key, subKeyC, nullptr, &dataType, nullptr, &dataSize);
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if (ret != ERROR_SUCCESS)
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return {};
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// Workaround for rare cases where the trailing '\0' is missing.
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if (dataType == REG_SZ || dataType == REG_EXPAND_SZ)
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dataSize += 2;
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else if (dataType == REG_MULTI_SZ)
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dataSize += 4;
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// Get the value.
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QVarLengthArray<unsigned char> data(dataSize);
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std::fill(data.data(), data.data() + dataSize, 0u);
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ret = RegQueryValueExW(m_key, subKeyC, nullptr, nullptr, data.data(), &dataSize);
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if (ret != ERROR_SUCCESS)
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return {};
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switch (dataType) {
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case REG_SZ:
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case REG_EXPAND_SZ: {
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if (dataSize > 0) {
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return QString::fromWCharArray(
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reinterpret_cast<const wchar_t *>(data.constData()));
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}
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return QString();
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}
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case REG_MULTI_SZ: {
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if (dataSize > 0) {
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QStringList list = {};
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int i = 0;
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while (true) {
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const QString str = QString::fromWCharArray(
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reinterpret_cast<const wchar_t *>(data.constData()) + i);
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i += str.length() + 1;
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if (str.isEmpty())
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break;
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list.append(str);
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}
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return list;
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}
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return QStringList();
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}
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case REG_NONE: // No specific type, treat as binary data.
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case REG_BINARY: {
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if (dataSize > 0) {
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return QString::fromWCharArray(
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reinterpret_cast<const wchar_t *>(data.constData()), data.size() / 2);
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}
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return QString();
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}
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case REG_DWORD: // Same as REG_DWORD_LITTLE_ENDIAN
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return qFromLittleEndian<quint32>(data.constData());
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case REG_DWORD_BIG_ENDIAN:
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return qFromBigEndian<quint32>(data.constData());
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case REG_QWORD: // Same as REG_QWORD_LITTLE_ENDIAN
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return qFromLittleEndian<quint64>(data.constData());
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default:
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break;
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}
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return {};
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}
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QString QWinRegistryKey::stringValue(QStringView subKey) const
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{
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return value<QString>(subKey).value_or(QString());
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}
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QPair<DWORD, bool> QWinRegistryKey::dwordValue(QStringView subKey) const
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{
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const std::optional<DWORD> val = value<DWORD>(subKey);
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return qMakePair(val.value_or(0), val.has_value());
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}
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QT_END_NAMESPACE
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