WritePwrScheme

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

BOOLEAN WritePwrScheme(
    DWORD* puiID,
    LPCWSTR lpszSchemeName,
    LPCWSTR lpszDescription,   // optional
    POWER_POLICY* lpScheme
);

<DllImport("POWRPROF.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WritePwrScheme(
    ByRef puiID As UInteger,   ' DWORD*
    <MarshalAs(UnmanagedType.LPWStr)> lpszSchemeName As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> lpszDescription As String,   ' LPCWSTR optional
    lpScheme As IntPtr   ' POWER_POLICY*
) As Byte
End Function

' puiID : DWORD*
' lpszSchemeName : LPCWSTR
' lpszDescription : LPCWSTR optional
' lpScheme : POWER_POLICY*
Declare PtrSafe Function WritePwrScheme Lib "powrprof" ( _
    ByRef puiID As Long, _
    ByVal lpszSchemeName As LongPtr, _
    ByVal lpszDescription As LongPtr, _
    ByVal lpScheme 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

WritePwrScheme = ctypes.windll.powrprof.WritePwrScheme
WritePwrScheme.restype = ctypes.c_byte
WritePwrScheme.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # puiID : DWORD*
    wintypes.LPCWSTR,  # lpszSchemeName : LPCWSTR
    wintypes.LPCWSTR,  # lpszDescription : LPCWSTR optional
    ctypes.c_void_p,  # lpScheme : POWER_POLICY*
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('POWRPROF.dll')
WritePwrScheme = Fiddle::Function.new(
  lib['WritePwrScheme'],
  [
    Fiddle::TYPE_VOIDP,  # puiID : DWORD*
    Fiddle::TYPE_VOIDP,  # lpszSchemeName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpszDescription : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # lpScheme : POWER_POLICY*
  ],
  Fiddle::TYPE_CHAR)

#[link(name = "powrprof")]
extern "system" {
    fn WritePwrScheme(
        puiID: *mut u32,  // DWORD*
        lpszSchemeName: *const u16,  // LPCWSTR
        lpszDescription: *const u16,  // LPCWSTR optional
        lpScheme: *mut POWER_POLICY  // POWER_POLICY*
    ) -> u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("POWRPROF.dll", SetLastError = true)]
public static extern byte WritePwrScheme(ref uint puiID, [MarshalAs(UnmanagedType.LPWStr)] string lpszSchemeName, [MarshalAs(UnmanagedType.LPWStr)] string lpszDescription, IntPtr lpScheme);
"@
$api = Add-Type -MemberDefinition $sig -Name 'POWRPROF_WritePwrScheme' -Namespace Win32 -PassThru
# $api::WritePwrScheme(puiID, lpszSchemeName, lpszDescription, lpScheme)

#uselib "POWRPROF.dll"
#func global WritePwrScheme "WritePwrScheme" sptr, sptr, sptr, sptr
; WritePwrScheme varptr(puiID), lpszSchemeName, lpszDescription, varptr(lpScheme)   ; 戻り値は stat
; puiID : DWORD* -> "sptr"
; lpszSchemeName : LPCWSTR -> "sptr"
; lpszDescription : LPCWSTR optional -> "sptr"
; lpScheme : POWER_POLICY* -> "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 WritePwrScheme "WritePwrScheme" var, wstr, wstr, var
; res = WritePwrScheme(puiID, lpszSchemeName, lpszDescription, lpScheme)
; puiID : DWORD* -> "var"
; lpszSchemeName : LPCWSTR -> "wstr"
; lpszDescription : LPCWSTR optional -> "wstr"
; lpScheme : POWER_POLICY* -> "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 WritePwrScheme(DWORD* puiID, LPCWSTR lpszSchemeName, LPCWSTR lpszDescription, POWER_POLICY* lpScheme)
#uselib "POWRPROF.dll"
#cfunc global WritePwrScheme "WritePwrScheme" var, wstr, wstr, var
; res = WritePwrScheme(puiID, lpszSchemeName, lpszDescription, lpScheme)
; puiID : DWORD* -> "var"
; lpszSchemeName : LPCWSTR -> "wstr"
; lpszDescription : LPCWSTR optional -> "wstr"
; lpScheme : POWER_POLICY* -> "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")
	procWritePwrScheme = powrprof.NewProc("WritePwrScheme")
)

// puiID (DWORD*), lpszSchemeName (LPCWSTR), lpszDescription (LPCWSTR optional), lpScheme (POWER_POLICY*)
r1, _, err := procWritePwrScheme.Call(
	uintptr(puiID),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszSchemeName))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszDescription))),
	uintptr(lpScheme),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOLEAN

function WritePwrScheme(
  puiID: Pointer;   // DWORD*
  lpszSchemeName: PWideChar;   // LPCWSTR
  lpszDescription: PWideChar;   // LPCWSTR optional
  lpScheme: Pointer   // POWER_POLICY*
): ByteBool; stdcall;
  external 'POWRPROF.dll' name 'WritePwrScheme';

result := DllCall("POWRPROF\WritePwrScheme"
    , "Ptr", puiID   ; DWORD*
    , "WStr", lpszSchemeName   ; LPCWSTR
    , "WStr", lpszDescription   ; LPCWSTR optional
    , "Ptr", lpScheme   ; POWER_POLICY*
    , "Char")   ; return: BOOLEAN

●WritePwrScheme(puiID, lpszSchemeName, lpszDescription, lpScheme) = DLL("POWRPROF.dll", "byte WritePwrScheme(void*, char*, char*, void*)")
# 呼び出し: WritePwrScheme(puiID, lpszSchemeName, lpszDescription, lpScheme)
# puiID : DWORD* -> "void*"
# lpszSchemeName : LPCWSTR -> "char*"
# lpszDescription : LPCWSTR optional -> "char*"
# lpScheme : POWER_POLICY* -> "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)。