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| ****************************************************************************/ |
| |
| #include "qwinregistry_p.h" |
| |
| #include <QtCore/qvarlengtharray.h> |
| |
| #include <algorithm> |
| |
| QT_BEGIN_NAMESPACE |
| |
| QWinRegistryKey::QWinRegistryKey() : |
| m_key(nullptr) |
| { |
| } |
| |
| // Open a key with the specified permissions (KEY_READ/KEY_WRITE). |
| // "access" is to explicitly use the 32- or 64-bit branch. |
| QWinRegistryKey::QWinRegistryKey(HKEY parentHandle, QStringView subKey, |
| REGSAM permissions, REGSAM access) |
| { |
| if (RegOpenKeyEx(parentHandle, reinterpret_cast<const wchar_t *>(subKey.utf16()), |
| 0, permissions | access, &m_key) != ERROR_SUCCESS) { |
| m_key = nullptr; |
| } |
| } |
| |
| QWinRegistryKey::~QWinRegistryKey() |
| { |
| close(); |
| } |
| |
| void QWinRegistryKey::close() |
| { |
| if (isValid()) { |
| RegCloseKey(m_key); |
| m_key = nullptr; |
| } |
| } |
| |
| QString QWinRegistryKey::stringValue(QStringView subKey) const |
| { |
| QString result; |
| if (!isValid()) |
| return result; |
| DWORD type; |
| DWORD size; |
| auto subKeyC = reinterpret_cast<const wchar_t *>(subKey.utf16()); |
| if (RegQueryValueEx(m_key, subKeyC, nullptr, &type, nullptr, &size) != ERROR_SUCCESS |
| || (type != REG_SZ && type != REG_EXPAND_SZ) || size <= 2) { |
| return result; |
| } |
| // Reserve more for rare cases where trailing '\0' are missing in registry, |
| // otherwise chop off the '\0' received. |
| QString buffer(int(size / sizeof(wchar_t)), Qt::Uninitialized); |
| if (RegQueryValueEx(m_key, subKeyC, nullptr, &type, |
| reinterpret_cast<LPBYTE>(buffer.data()), &size) == ERROR_SUCCESS) { |
| if (buffer.endsWith(QChar::Null)) |
| buffer.chop(1); |
| } else { |
| buffer.clear(); |
| } |
| return buffer; |
| } |
| |
| QPair<DWORD, bool> QWinRegistryKey::dwordValue(QStringView subKey) const |
| { |
| if (!isValid()) |
| return qMakePair(0, false); |
| DWORD type; |
| auto subKeyC = reinterpret_cast<const wchar_t *>(subKey.utf16()); |
| if (RegQueryValueEx(m_key, subKeyC, nullptr, &type, nullptr, nullptr) != ERROR_SUCCESS |
| || type != REG_DWORD) { |
| return qMakePair(0, false); |
| } |
| DWORD value = 0; |
| DWORD size = sizeof(value); |
| const bool ok = |
| RegQueryValueEx(m_key, subKeyC, nullptr, nullptr, |
| reinterpret_cast<unsigned char *>(&value), &size) == ERROR_SUCCESS; |
| return qMakePair(value, ok); |
| } |
| |
| QT_END_NAMESPACE |