SetActivePwrScheme

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

BOOLEAN SetActivePwrScheme(
    DWORD uiID,
    GLOBAL_POWER_POLICY* pGlobalPowerPolicy,   // optional
    POWER_POLICY* pPowerPolicy   // optional
);

<DllImport("POWRPROF.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetActivePwrScheme(
    uiID As UInteger,   ' DWORD
    pGlobalPowerPolicy As IntPtr,   ' GLOBAL_POWER_POLICY* optional
    pPowerPolicy As IntPtr   ' POWER_POLICY* optional
) As Byte
End Function

' uiID : DWORD
' pGlobalPowerPolicy : GLOBAL_POWER_POLICY* optional
' pPowerPolicy : POWER_POLICY* optional
Declare PtrSafe Function SetActivePwrScheme Lib "powrprof" ( _
    ByVal uiID As Long, _
    ByVal pGlobalPowerPolicy As LongPtr, _
    ByVal pPowerPolicy As LongPtr) As Byte
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SetActivePwrScheme = ctypes.windll.powrprof.SetActivePwrScheme
SetActivePwrScheme.restype = ctypes.c_byte
SetActivePwrScheme.argtypes = [
    wintypes.DWORD,  # uiID : DWORD
    ctypes.c_void_p,  # pGlobalPowerPolicy : GLOBAL_POWER_POLICY* optional
    ctypes.c_void_p,  # pPowerPolicy : POWER_POLICY* optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('POWRPROF.dll')
SetActivePwrScheme = Fiddle::Function.new(
  lib['SetActivePwrScheme'],
  [
    -Fiddle::TYPE_INT,  # uiID : DWORD
    Fiddle::TYPE_VOIDP,  # pGlobalPowerPolicy : GLOBAL_POWER_POLICY* optional
    Fiddle::TYPE_VOIDP,  # pPowerPolicy : POWER_POLICY* optional
  ],
  Fiddle::TYPE_CHAR)

#[link(name = "powrprof")]
extern "system" {
    fn SetActivePwrScheme(
        uiID: u32,  // DWORD
        pGlobalPowerPolicy: *mut GLOBAL_POWER_POLICY,  // GLOBAL_POWER_POLICY* optional
        pPowerPolicy: *mut POWER_POLICY  // POWER_POLICY* optional
    ) -> u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("POWRPROF.dll", SetLastError = true)]
public static extern byte SetActivePwrScheme(uint uiID, IntPtr pGlobalPowerPolicy, IntPtr pPowerPolicy);
"@
$api = Add-Type -MemberDefinition $sig -Name 'POWRPROF_SetActivePwrScheme' -Namespace Win32 -PassThru
# $api::SetActivePwrScheme(uiID, pGlobalPowerPolicy, pPowerPolicy)

#uselib "POWRPROF.dll"
#func global SetActivePwrScheme "SetActivePwrScheme" sptr, sptr, sptr
; SetActivePwrScheme uiID, varptr(pGlobalPowerPolicy), varptr(pPowerPolicy)   ; 戻り値は stat
; uiID : DWORD -> "sptr"
; pGlobalPowerPolicy : GLOBAL_POWER_POLICY* optional -> "sptr"
; pPowerPolicy : POWER_POLICY* optional -> "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 SetActivePwrScheme "SetActivePwrScheme" int, var, var
; res = SetActivePwrScheme(uiID, pGlobalPowerPolicy, pPowerPolicy)
; uiID : DWORD -> "int"
; pGlobalPowerPolicy : GLOBAL_POWER_POLICY* optional -> "var"
; pPowerPolicy : POWER_POLICY* optional -> "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。

; BOOLEAN SetActivePwrScheme(DWORD uiID, GLOBAL_POWER_POLICY* pGlobalPowerPolicy, POWER_POLICY* pPowerPolicy)
#uselib "POWRPROF.dll"
#cfunc global SetActivePwrScheme "SetActivePwrScheme" int, var, var
; res = SetActivePwrScheme(uiID, pGlobalPowerPolicy, pPowerPolicy)
; uiID : DWORD -> "int"
; pGlobalPowerPolicy : GLOBAL_POWER_POLICY* optional -> "var"
; pPowerPolicy : POWER_POLICY* optional -> "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")
	procSetActivePwrScheme = powrprof.NewProc("SetActivePwrScheme")
)

// uiID (DWORD), pGlobalPowerPolicy (GLOBAL_POWER_POLICY* optional), pPowerPolicy (POWER_POLICY* optional)
r1, _, err := procSetActivePwrScheme.Call(
	uintptr(uiID),
	uintptr(pGlobalPowerPolicy),
	uintptr(pPowerPolicy),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOLEAN

function SetActivePwrScheme(
  uiID: DWORD;   // DWORD
  pGlobalPowerPolicy: Pointer;   // GLOBAL_POWER_POLICY* optional
  pPowerPolicy: Pointer   // POWER_POLICY* optional
): ByteBool; stdcall;
  external 'POWRPROF.dll' name 'SetActivePwrScheme';

result := DllCall("POWRPROF\SetActivePwrScheme"
    , "UInt", uiID   ; DWORD
    , "Ptr", pGlobalPowerPolicy   ; GLOBAL_POWER_POLICY* optional
    , "Ptr", pPowerPolicy   ; POWER_POLICY* optional
    , "Char")   ; return: BOOLEAN

●SetActivePwrScheme(uiID, pGlobalPowerPolicy, pPowerPolicy) = DLL("POWRPROF.dll", "byte SetActivePwrScheme(dword, void*, void*)")
# 呼び出し: SetActivePwrScheme(uiID, pGlobalPowerPolicy, pPowerPolicy)
# uiID : DWORD -> "dword"
# pGlobalPowerPolicy : GLOBAL_POWER_POLICY* optional -> "void*"
# pPowerPolicy : POWER_POLICY* optional -> "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)。