Windows Vista以降で画面の明るさを取得・設定するサンプルコードです。
画面の明るさの範囲と設定値を取得する。
#include <iostream> #include <string> #include <optional> #define STRICT #include <Windows.h> #include <powrprof.h> #pragma comment(lib, "powrprof.lib") namespace PowerUtil { std::optional<GUID> GetActiveSchemeGUID() noexcept { LPGUID pguid; auto ret = ::PowerGetActiveScheme(nullptr, &pguid); if (ret != NOERROR) return {}; GUID guid; ::RtlCopyMemory(&guid, pguid, sizeof(GUID)); ::LocalFree(pguid); return guid; } std::optional<std::wstring> ReadDescription( const GUID* SchemeGuid, const GUID* SubGroupOfPowerSettingsGuid, const GUID* PowerSettingGuid) noexcept(false) { DWORD bufferSize; if (::PowerReadDescription( nullptr, SchemeGuid, SubGroupOfPowerSettingsGuid, PowerSettingGuid, nullptr, &bufferSize) != NOERROR) { return {}; } std::wstring buffer(bufferSize / sizeof(wchar_t) - 1, L'\0'); if (::PowerReadDescription( nullptr, SchemeGuid, SubGroupOfPowerSettingsGuid, PowerSettingGuid, reinterpret_cast<PUCHAR>(buffer.data()), &bufferSize) != NOERROR) { return {}; } return std::move(buffer); } std::optional<std::wstring> ReadFriendlyName( const GUID* SchemeGuid, const GUID* SubGroupOfPowerSettingsGuid, const GUID* PowerSettingGuid) noexcept(false) { DWORD bufferSize; if (::PowerReadFriendlyName( nullptr, SchemeGuid, SubGroupOfPowerSettingsGuid, PowerSettingGuid, nullptr, &bufferSize) != NOERROR) { return {}; } std::wstring buffer(bufferSize / sizeof(wchar_t) - 1, L'\0'); if (::PowerReadFriendlyName( nullptr, SchemeGuid, SubGroupOfPowerSettingsGuid, PowerSettingGuid, reinterpret_cast<PUCHAR>(buffer.data()), &bufferSize) != NOERROR) { return {}; } return std::move(buffer); } std::optional<DWORD> ReadValueMin( const GUID* SubGroupOfPowerSettingsGuid, const GUID* PowerSettingGuid) noexcept { DWORD value; auto ret = ::PowerReadValueMin( nullptr, SubGroupOfPowerSettingsGuid, PowerSettingGuid, &value); return ret == NOERROR ? value : value; } std::optional<DWORD> ReadValueMax( const GUID* SubGroupOfPowerSettingsGuid, const GUID* PowerSettingGuid) noexcept { DWORD value; auto ret = ::PowerReadValueMax( nullptr, SubGroupOfPowerSettingsGuid, PowerSettingGuid, &value); return ret == NOERROR ? value : value; } std::optional<DWORD> ReadACValueIndex( const GUID* SchemeGuid, const GUID* SubGroupOfPowerSettingsGuid, const GUID* PowerSettingGuid) noexcept { DWORD value; auto ret = ::PowerReadACValueIndex( nullptr, SchemeGuid, SubGroupOfPowerSettingsGuid, PowerSettingGuid, &value); return ret == NOERROR ? value : value; } std::optional<DWORD> ReadDCValueIndex( const GUID* SchemeGuid, const GUID* SubGroupOfPowerSettingsGuid, const GUID* PowerSettingGuid) noexcept { DWORD value; auto ret = ::PowerReadDCValueIndex( nullptr, SchemeGuid, SubGroupOfPowerSettingsGuid, PowerSettingGuid, &value); return ret == NOERROR ? value : value; } } int main() { std::wcout.imbue(std::locale("Japanese", std::locale::ctype)); // 現在の電源プロファイルのScheme GUIDを取得する。 auto schemeGuid = PowerUtil::GetActiveSchemeGUID(); if (!schemeGuid) return ::GetLastError(); // 画面の明るさの範囲を取得する。 auto definesRange = (bool)::PowerIsSettingRangeDefined( &GUID_VIDEO_SUBGROUP, &GUID_DEVICE_POWER_POLICY_VIDEO_BRIGHTNESS); auto minValue = PowerUtil::ReadValueMin( &GUID_VIDEO_SUBGROUP, &GUID_DEVICE_POWER_POLICY_VIDEO_BRIGHTNESS); auto maxValue = PowerUtil::ReadValueMax( &GUID_VIDEO_SUBGROUP, &GUID_DEVICE_POWER_POLICY_VIDEO_BRIGHTNESS); // 現在の電源設定の画面の明るさを取得する。 auto acValue = PowerUtil::ReadACValueIndex( &*schemeGuid, &GUID_VIDEO_SUBGROUP, &GUID_DEVICE_POWER_POLICY_VIDEO_BRIGHTNESS); auto dcValue = PowerUtil::ReadDCValueIndex( &*schemeGuid, &GUID_VIDEO_SUBGROUP, &GUID_DEVICE_POWER_POLICY_VIDEO_BRIGHTNESS); // 現在の電源プロファイルの画面の明るさの概要・説明を取得する。 auto description = PowerUtil::ReadDescription( &*schemeGuid, &GUID_VIDEO_SUBGROUP, &GUID_DEVICE_POWER_POLICY_VIDEO_BRIGHTNESS); auto friendlyName = PowerUtil::ReadFriendlyName( &*schemeGuid, &GUID_VIDEO_SUBGROUP, &GUID_DEVICE_POWER_POLICY_VIDEO_BRIGHTNESS); return err; }
画面の明るさを設定する。
#include <iostream> #include <string> #include <optional> #define STRICT #include <Windows.h> #include <powrprof.h> #pragma comment(lib, "powrprof.lib") namespace PowerUtil { std::optional<GUID> GetActiveSchemeGUID() noexcept { LPGUID pguid; auto ret = ::PowerGetActiveScheme(nullptr, &pguid); if (ret != NOERROR) return {}; GUID guid; ::RtlCopyMemory(&guid, pguid, sizeof(GUID)); ::LocalFree(pguid); return guid; } } int main() { std::wcout.imbue(std::locale("Japanese", std::locale::ctype)); // 現在の電源プロファイルのScheme GUIDを取得する。 auto schemeGuid = PowerUtil::GetActiveSchemeGUID(); if (!schemeGuid) return ::GetLastError(); // 現在の電源プロファイルの画面の明るさを設定する。 DWORD err{ 0 }; err = ::PowerWriteACValueIndex( nullptr, &*schemeGuid, &GUID_VIDEO_SUBGROUP, &GUID_DEVICE_POWER_POLICY_VIDEO_BRIGHTNESS, 50); err = ::PowerWriteDCValueIndex( nullptr, &*schemeGuid, &GUID_VIDEO_SUBGROUP, &GUID_DEVICE_POWER_POLICY_VIDEO_BRIGHTNESS, 50); err = ::PowerSetActiveScheme( nullptr, &*schemeGuid); return err; }
現在の画面プロファイルの概要・名前を取得する。
#include <iostream> #include <string> #include <optional> #define STRICT #include <Windows.h> #include <powrprof.h> #pragma comment(lib, "powrprof.lib") namespace PowerUtil { std::optional<GUID> GetActiveSchemeGUID() noexcept { LPGUID pguid; auto ret = ::PowerGetActiveScheme(nullptr, &pguid); if (ret != NOERROR) return {}; GUID guid; ::RtlCopyMemory(&guid, pguid, sizeof(GUID)); ::LocalFree(pguid); return guid; } std::optional<std::wstring> ReadDescription( const GUID* SchemeGuid, const GUID* SubGroupOfPowerSettingsGuid, const GUID* PowerSettingGuid) noexcept(false) { DWORD bufferSize; if (::PowerReadDescription( nullptr, SchemeGuid, SubGroupOfPowerSettingsGuid, PowerSettingGuid, nullptr, &bufferSize) != NOERROR) { return {}; } std::wstring buffer(bufferSize / sizeof(wchar_t) - 1, L'\0'); if (::PowerReadDescription( nullptr, SchemeGuid, SubGroupOfPowerSettingsGuid, PowerSettingGuid, reinterpret_cast<PUCHAR>(buffer.data()), &bufferSize) != NOERROR) { return {}; } return std::move(buffer); } std::optional<std::wstring> ReadFriendlyName( const GUID* SchemeGuid, const GUID* SubGroupOfPowerSettingsGuid, const GUID* PowerSettingGuid) noexcept(false) { DWORD bufferSize; if (::PowerReadFriendlyName( nullptr, SchemeGuid, SubGroupOfPowerSettingsGuid, PowerSettingGuid, nullptr, &bufferSize) != NOERROR) { return {}; } std::wstring buffer(bufferSize / sizeof(wchar_t) - 1, L'\0'); if (::PowerReadFriendlyName( nullptr, SchemeGuid, SubGroupOfPowerSettingsGuid, PowerSettingGuid, reinterpret_cast<PUCHAR>(buffer.data()), &bufferSize) != NOERROR) { return {}; } return std::move(buffer); } } int main() { std::wcout.imbue(std::locale("Japanese", std::locale::ctype)); // 現在の電源プロファイルのScheme GUIDを取得する。 auto schemeGuid = PowerUtil::GetActiveSchemeGUID(); if (!schemeGuid) return ::GetLastError(); // 現在の電源プロファイルの概要・説明を取得する。 auto description = PowerUtil::ReadDescription( &*schemeGuid, &NO_SUBGROUP_GUID, nullptr); auto friendlyName = PowerUtil::ReadFriendlyName( &*schemeGuid, &GUID_VIDEO_SUBGROUP, nullptr); return 0; }
