PowerGetActiveScheme

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

WIN32_ERROR PowerGetActiveScheme(
    HKEY UserRootPowerKey,   // optional
    GUID** ActivePolicyGuid
);

<DllImport("POWRPROF.dll", ExactSpelling:=True)>
Public Shared Function PowerGetActiveScheme(
    UserRootPowerKey As IntPtr,   ' HKEY optional
    ActivePolicyGuid As IntPtr   ' GUID** out
) As UInteger
End Function

' UserRootPowerKey : HKEY optional
' ActivePolicyGuid : GUID** out
Declare PtrSafe Function PowerGetActiveScheme Lib "powrprof" ( _
    ByVal UserRootPowerKey As LongPtr, _
    ByVal ActivePolicyGuid As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

PowerGetActiveScheme = ctypes.windll.powrprof.PowerGetActiveScheme
PowerGetActiveScheme.restype = wintypes.DWORD
PowerGetActiveScheme.argtypes = [
    wintypes.HANDLE,  # UserRootPowerKey : HKEY optional
    ctypes.c_void_p,  # ActivePolicyGuid : GUID** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('POWRPROF.dll')
PowerGetActiveScheme = Fiddle::Function.new(
  lib['PowerGetActiveScheme'],
  [
    Fiddle::TYPE_VOIDP,  # UserRootPowerKey : HKEY optional
    Fiddle::TYPE_VOIDP,  # ActivePolicyGuid : GUID** out
  ],
  -Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("POWRPROF.dll")]
public static extern uint PowerGetActiveScheme(IntPtr UserRootPowerKey, IntPtr ActivePolicyGuid);
"@
$api = Add-Type -MemberDefinition $sig -Name 'POWRPROF_PowerGetActiveScheme' -Namespace Win32 -PassThru
# $api::PowerGetActiveScheme(UserRootPowerKey, ActivePolicyGuid)

#uselib "POWRPROF.dll"
#func global PowerGetActiveScheme "PowerGetActiveScheme" sptr, sptr
; PowerGetActiveScheme UserRootPowerKey, varptr(ActivePolicyGuid)   ; 戻り値は stat
; UserRootPowerKey : HKEY optional -> "sptr"
; ActivePolicyGuid : GUID** 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 PowerGetActiveScheme "PowerGetActiveScheme" sptr, var
; res = PowerGetActiveScheme(UserRootPowerKey, ActivePolicyGuid)
; UserRootPowerKey : HKEY optional -> "sptr"
; ActivePolicyGuid : GUID** 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 PowerGetActiveScheme(HKEY UserRootPowerKey, GUID** ActivePolicyGuid)
#uselib "POWRPROF.dll"
#cfunc global PowerGetActiveScheme "PowerGetActiveScheme" intptr, var
; res = PowerGetActiveScheme(UserRootPowerKey, ActivePolicyGuid)
; UserRootPowerKey : HKEY optional -> "intptr"
; ActivePolicyGuid : GUID** 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")
	procPowerGetActiveScheme = powrprof.NewProc("PowerGetActiveScheme")
)

// UserRootPowerKey (HKEY optional), ActivePolicyGuid (GUID** out)
r1, _, err := procPowerGetActiveScheme.Call(
	uintptr(UserRootPowerKey),
	uintptr(ActivePolicyGuid),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function PowerGetActiveScheme(
  UserRootPowerKey: THandle;   // HKEY optional
  ActivePolicyGuid: PGUID   // GUID** out
): DWORD; stdcall;
  external 'POWRPROF.dll' name 'PowerGetActiveScheme';

result := DllCall("POWRPROF\PowerGetActiveScheme"
    , "Ptr", UserRootPowerKey   ; HKEY optional
    , "Ptr", ActivePolicyGuid   ; GUID** out
    , "UInt")   ; return: WIN32_ERROR

●PowerGetActiveScheme(UserRootPowerKey, ActivePolicyGuid) = DLL("POWRPROF.dll", "dword PowerGetActiveScheme(void*, void*)")
# 呼び出し: PowerGetActiveScheme(UserRootPowerKey, ActivePolicyGuid)
# UserRootPowerKey : HKEY optional -> "void*"
# ActivePolicyGuid : GUID** 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)。