GetFirmwareEnvironmentVariableExW

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

DWORD GetFirmwareEnvironmentVariableExW(
    LPCWSTR lpName,
    LPCWSTR lpGuid,
    void* pBuffer,   // optional
    DWORD nSize,
    DWORD* pdwAttribubutes   // optional
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetFirmwareEnvironmentVariableExW(
    <MarshalAs(UnmanagedType.LPWStr)> lpName As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> lpGuid As String,   ' LPCWSTR
    pBuffer As IntPtr,   ' void* optional, out
    nSize As UInteger,   ' DWORD
    pdwAttribubutes As IntPtr   ' DWORD* optional, out
) As UInteger
End Function

' lpName : LPCWSTR
' lpGuid : LPCWSTR
' pBuffer : void* optional, out
' nSize : DWORD
' pdwAttribubutes : DWORD* optional, out
Declare PtrSafe Function GetFirmwareEnvironmentVariableExW Lib "kernel32" ( _
    ByVal lpName As LongPtr, _
    ByVal lpGuid As LongPtr, _
    ByVal pBuffer As LongPtr, _
    ByVal nSize As Long, _
    ByVal pdwAttribubutes As LongPtr) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetFirmwareEnvironmentVariableExW = ctypes.windll.kernel32.GetFirmwareEnvironmentVariableExW
GetFirmwareEnvironmentVariableExW.restype = wintypes.DWORD
GetFirmwareEnvironmentVariableExW.argtypes = [
    wintypes.LPCWSTR,  # lpName : LPCWSTR
    wintypes.LPCWSTR,  # lpGuid : LPCWSTR
    ctypes.POINTER(None),  # pBuffer : void* optional, out
    wintypes.DWORD,  # nSize : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pdwAttribubutes : DWORD* optional, out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetFirmwareEnvironmentVariableExW = Fiddle::Function.new(
  lib['GetFirmwareEnvironmentVariableExW'],
  [
    Fiddle::TYPE_VOIDP,  # lpName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpGuid : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pBuffer : void* optional, out
    -Fiddle::TYPE_INT,  # nSize : DWORD
    Fiddle::TYPE_VOIDP,  # pdwAttribubutes : DWORD* optional, out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn GetFirmwareEnvironmentVariableExW(
        lpName: *const u16,  // LPCWSTR
        lpGuid: *const u16,  // LPCWSTR
        pBuffer: *mut (),  // void* optional, out
        nSize: u32,  // DWORD
        pdwAttribubutes: *mut u32  // DWORD* optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern uint GetFirmwareEnvironmentVariableExW([MarshalAs(UnmanagedType.LPWStr)] string lpName, [MarshalAs(UnmanagedType.LPWStr)] string lpGuid, IntPtr pBuffer, uint nSize, IntPtr pdwAttribubutes);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetFirmwareEnvironmentVariableExW' -Namespace Win32 -PassThru
# $api::GetFirmwareEnvironmentVariableExW(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes)

#uselib "KERNEL32.dll"
#func global GetFirmwareEnvironmentVariableExW "GetFirmwareEnvironmentVariableExW" wptr, wptr, wptr, wptr, wptr
; GetFirmwareEnvironmentVariableExW lpName, lpGuid, pBuffer, nSize, varptr(pdwAttribubutes)   ; 戻り値は stat
; lpName : LPCWSTR -> "wptr"
; lpGuid : LPCWSTR -> "wptr"
; pBuffer : void* optional, out -> "wptr"
; nSize : DWORD -> "wptr"
; pdwAttribubutes : DWORD* optional, out -> "wptr"
; ※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 "KERNEL32.dll"
#cfunc global GetFirmwareEnvironmentVariableExW "GetFirmwareEnvironmentVariableExW" wstr, wstr, sptr, int, var
; res = GetFirmwareEnvironmentVariableExW(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes)
; lpName : LPCWSTR -> "wstr"
; lpGuid : LPCWSTR -> "wstr"
; pBuffer : void* optional, out -> "sptr"
; nSize : DWORD -> "int"
; pdwAttribubutes : DWORD* optional, 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。

; DWORD GetFirmwareEnvironmentVariableExW(LPCWSTR lpName, LPCWSTR lpGuid, void* pBuffer, DWORD nSize, DWORD* pdwAttribubutes)
#uselib "KERNEL32.dll"
#cfunc global GetFirmwareEnvironmentVariableExW "GetFirmwareEnvironmentVariableExW" wstr, wstr, intptr, int, var
; res = GetFirmwareEnvironmentVariableExW(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes)
; lpName : LPCWSTR -> "wstr"
; lpGuid : LPCWSTR -> "wstr"
; pBuffer : void* optional, out -> "intptr"
; nSize : DWORD -> "int"
; pdwAttribubutes : DWORD* optional, 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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetFirmwareEnvironmentVariableExW = kernel32.NewProc("GetFirmwareEnvironmentVariableExW")
)

// lpName (LPCWSTR), lpGuid (LPCWSTR), pBuffer (void* optional, out), nSize (DWORD), pdwAttribubutes (DWORD* optional, out)
r1, _, err := procGetFirmwareEnvironmentVariableExW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpName))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpGuid))),
	uintptr(pBuffer),
	uintptr(nSize),
	uintptr(pdwAttribubutes),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetFirmwareEnvironmentVariableExW(
  lpName: PWideChar;   // LPCWSTR
  lpGuid: PWideChar;   // LPCWSTR
  pBuffer: Pointer;   // void* optional, out
  nSize: DWORD;   // DWORD
  pdwAttribubutes: Pointer   // DWORD* optional, out
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetFirmwareEnvironmentVariableExW';

result := DllCall("KERNEL32\GetFirmwareEnvironmentVariableExW"
    , "WStr", lpName   ; LPCWSTR
    , "WStr", lpGuid   ; LPCWSTR
    , "Ptr", pBuffer   ; void* optional, out
    , "UInt", nSize   ; DWORD
    , "Ptr", pdwAttribubutes   ; DWORD* optional, out
    , "UInt")   ; return: DWORD

●GetFirmwareEnvironmentVariableExW(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes) = DLL("KERNEL32.dll", "dword GetFirmwareEnvironmentVariableExW(char*, char*, void*, dword, void*)")
# 呼び出し: GetFirmwareEnvironmentVariableExW(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes)
# lpName : LPCWSTR -> "char*"
# lpGuid : LPCWSTR -> "char*"
# pBuffer : void* optional, out -> "void*"
# nSize : DWORD -> "dword"
# pdwAttribubutes : DWORD* optional, 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。