PowerReadValueMax

// POWRPROF.dll
#include <windows.h>

WIN32_ERROR PowerReadValueMax(
    HKEY RootPowerKey,   // optional
    const GUID* SubGroupOfPowerSettingsGuid,   // optional
    const GUID* PowerSettingGuid,   // optional
    DWORD* ValueMaximum
);

<DllImport("POWRPROF.dll", ExactSpelling:=True)>
Public Shared Function PowerReadValueMax(
    RootPowerKey As IntPtr,   ' HKEY optional
    SubGroupOfPowerSettingsGuid As IntPtr,   ' GUID* optional
    PowerSettingGuid As IntPtr,   ' GUID* optional
    <Out> ByRef ValueMaximum As UInteger   ' DWORD* out
) As UInteger
End Function

' RootPowerKey : HKEY optional
' SubGroupOfPowerSettingsGuid : GUID* optional
' PowerSettingGuid : GUID* optional
' ValueMaximum : DWORD* out
Declare PtrSafe Function PowerReadValueMax Lib "powrprof" ( _
    ByVal RootPowerKey As LongPtr, _
    ByVal SubGroupOfPowerSettingsGuid As LongPtr, _
    ByVal PowerSettingGuid As LongPtr, _
    ByRef ValueMaximum As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

PowerReadValueMax = ctypes.windll.powrprof.PowerReadValueMax
PowerReadValueMax.restype = wintypes.DWORD
PowerReadValueMax.argtypes = [
    wintypes.HANDLE,  # RootPowerKey : HKEY optional
    ctypes.c_void_p,  # SubGroupOfPowerSettingsGuid : GUID* optional
    ctypes.c_void_p,  # PowerSettingGuid : GUID* optional
    ctypes.POINTER(wintypes.DWORD),  # ValueMaximum : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('POWRPROF.dll')
PowerReadValueMax = Fiddle::Function.new(
  lib['PowerReadValueMax'],
  [
    Fiddle::TYPE_VOIDP,  # RootPowerKey : HKEY optional
    Fiddle::TYPE_VOIDP,  # SubGroupOfPowerSettingsGuid : GUID* optional
    Fiddle::TYPE_VOIDP,  # PowerSettingGuid : GUID* optional
    Fiddle::TYPE_VOIDP,  # ValueMaximum : DWORD* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "powrprof")]
extern "system" {
    fn PowerReadValueMax(
        RootPowerKey: *mut core::ffi::c_void,  // HKEY optional
        SubGroupOfPowerSettingsGuid: *const GUID,  // GUID* optional
        PowerSettingGuid: *const GUID,  // GUID* optional
        ValueMaximum: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("POWRPROF.dll")]
public static extern uint PowerReadValueMax(IntPtr RootPowerKey, IntPtr SubGroupOfPowerSettingsGuid, IntPtr PowerSettingGuid, out uint ValueMaximum);
"@
$api = Add-Type -MemberDefinition $sig -Name 'POWRPROF_PowerReadValueMax' -Namespace Win32 -PassThru
# $api::PowerReadValueMax(RootPowerKey, SubGroupOfPowerSettingsGuid, PowerSettingGuid, ValueMaximum)

#uselib "POWRPROF.dll"
#func global PowerReadValueMax "PowerReadValueMax" sptr, sptr, sptr, sptr
; PowerReadValueMax RootPowerKey, varptr(SubGroupOfPowerSettingsGuid), varptr(PowerSettingGuid), varptr(ValueMaximum)   ; 戻り値は stat
; RootPowerKey : HKEY optional -> "sptr"
; SubGroupOfPowerSettingsGuid : GUID* optional -> "sptr"
; PowerSettingGuid : GUID* optional -> "sptr"
; ValueMaximum : DWORD* out -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "POWRPROF.dll"
#cfunc global PowerReadValueMax "PowerReadValueMax" sptr, var, var, var
; res = PowerReadValueMax(RootPowerKey, SubGroupOfPowerSettingsGuid, PowerSettingGuid, ValueMaximum)
; RootPowerKey : HKEY optional -> "sptr"
; SubGroupOfPowerSettingsGuid : GUID* optional -> "var"
; PowerSettingGuid : GUID* optional -> "var"
; ValueMaximum : DWORD* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; WIN32_ERROR PowerReadValueMax(HKEY RootPowerKey, GUID* SubGroupOfPowerSettingsGuid, GUID* PowerSettingGuid, DWORD* ValueMaximum)
#uselib "POWRPROF.dll"
#cfunc global PowerReadValueMax "PowerReadValueMax" intptr, var, var, var
; res = PowerReadValueMax(RootPowerKey, SubGroupOfPowerSettingsGuid, PowerSettingGuid, ValueMaximum)
; RootPowerKey : HKEY optional -> "intptr"
; SubGroupOfPowerSettingsGuid : GUID* optional -> "var"
; PowerSettingGuid : GUID* optional -> "var"
; ValueMaximum : DWORD* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	powrprof = windows.NewLazySystemDLL("POWRPROF.dll")
	procPowerReadValueMax = powrprof.NewProc("PowerReadValueMax")
)

// RootPowerKey (HKEY optional), SubGroupOfPowerSettingsGuid (GUID* optional), PowerSettingGuid (GUID* optional), ValueMaximum (DWORD* out)
r1, _, err := procPowerReadValueMax.Call(
	uintptr(RootPowerKey),
	uintptr(SubGroupOfPowerSettingsGuid),
	uintptr(PowerSettingGuid),
	uintptr(ValueMaximum),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function PowerReadValueMax(
  RootPowerKey: THandle;   // HKEY optional
  SubGroupOfPowerSettingsGuid: PGUID;   // GUID* optional
  PowerSettingGuid: PGUID;   // GUID* optional
  ValueMaximum: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'POWRPROF.dll' name 'PowerReadValueMax';

result := DllCall("POWRPROF\PowerReadValueMax"
    , "Ptr", RootPowerKey   ; HKEY optional
    , "Ptr", SubGroupOfPowerSettingsGuid   ; GUID* optional
    , "Ptr", PowerSettingGuid   ; GUID* optional
    , "Ptr", ValueMaximum   ; DWORD* out
    , "UInt")   ; return: WIN32_ERROR

●PowerReadValueMax(RootPowerKey, SubGroupOfPowerSettingsGuid, PowerSettingGuid, ValueMaximum) = DLL("POWRPROF.dll", "dword PowerReadValueMax(void*, void*, void*, void*)")
# 呼び出し: PowerReadValueMax(RootPowerKey, SubGroupOfPowerSettingsGuid, PowerSettingGuid, ValueMaximum)
# RootPowerKey : HKEY optional -> "void*"
# SubGroupOfPowerSettingsGuid : GUID* optional -> "void*"
# PowerSettingGuid : GUID* optional -> "void*"
# ValueMaximum : DWORD* out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。