libcruft-util/win32/registry.cpp

103 lines
3.1 KiB
C++

/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
#include "registry.hpp"
#include "../debug.hpp"
#include "../except.hpp"
#include <string>
#include <cstdint>
using util::win32::key;
///////////////////////////////////////////////////////////////////////////////
typedef uint64_t QWORD;
//-----------------------------------------------------------------------------
template <typename T> constexpr DWORD type_to_id (void);
template <> constexpr DWORD type_to_id<DWORD> (void) { return REG_DWORD; }
template <> constexpr DWORD type_to_id<QWORD> (void) { return REG_QWORD; }
template <> constexpr DWORD type_to_id<void> (void) { return REG_NONE; }
template <> constexpr DWORD type_to_id<std::string> (void) { return REG_SZ; }
//-----------------------------------------------------------------------------
template <typename T> constexpr DWORD restrict_to_id (void);
template <> constexpr DWORD restrict_to_id<DWORD> (void) { return RRF_RT_DWORD; }
template <> constexpr DWORD restrict_to_id<QWORD> (void) { return RRF_RT_QWORD; }
template <> constexpr DWORD restrict_to_id<void> (void) { return RRF_RT_REG_NONE; }
template <> constexpr DWORD restrict_to_id<std::string> (void) { return RRF_RT_REG_SZ; }
///////////////////////////////////////////////////////////////////////////////
key::key (HKEY root, const char *child, REGSAM rights)
{
auto err = RegOpenKeyEx (root, child, 0, rights, &m_handle);
win32_error::try_code (err);
}
//-----------------------------------------------------------------------------
key::~key ()
{
auto err = RegCloseKey (m_handle);
win32_error::try_code (err);
}
///////////////////////////////////////////////////////////////////////////////
template <typename T>
T
key::data (const char *name) const
{
T value;
DWORD type;
DWORD size = sizeof (value);
auto err = RegGetValue (m_handle, name, &value, restrict_to_id<T> (), nullptr, &value, &size);
win32_error::try_code (err);
return value;
}
//-----------------------------------------------------------------------------
std::set<std::string>
key::values (void) const
{
std::set<std::string> all;
for (DWORD i = 0; ; ++i) {
std::string name (255, '\0');
DWORD size = name.size ();
auto err = RegEnumValue (m_handle, i, &name[0], &size, nullptr, nullptr, nullptr, nullptr);
if (ERROR_NO_MORE_ITEMS == err)
return all;
if (ERROR_SUCCESS != err)
win32_error::throw_code (err);
CHECK_GT (size, 0);
name.resize (size - 1);
all.insert (std::move (name));
}
}