GetFirmwareEnvironmentVariableExA

// KERNEL32.dll  (ANSI / -A)
#include <windows.h>

DWORD GetFirmwareEnvironmentVariableExA(
    LPCSTR lpName,
    LPCSTR lpGuid,
    void* pBuffer,   // optional
    DWORD nSize,
    DWORD* pdwAttribubutes   // optional
);

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

' lpName : LPCSTR
' lpGuid : LPCSTR
' pBuffer : void* optional, out
' nSize : DWORD
' pdwAttribubutes : DWORD* optional, out
Declare PtrSafe Function GetFirmwareEnvironmentVariableExA Lib "kernel32" ( _
    ByVal lpName As String, _
    ByVal lpGuid As String, _
    ByVal pBuffer As LongPtr, _
    ByVal nSize As Long, _
    ByVal pdwAttribubutes 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

GetFirmwareEnvironmentVariableExA = ctypes.windll.kernel32.GetFirmwareEnvironmentVariableExA
GetFirmwareEnvironmentVariableExA.restype = wintypes.DWORD
GetFirmwareEnvironmentVariableExA.argtypes = [
    wintypes.LPCSTR,  # lpName : LPCSTR
    wintypes.LPCSTR,  # lpGuid : LPCSTR
    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')
GetFirmwareEnvironmentVariableExA = Fiddle::Function.new(
  lib['GetFirmwareEnvironmentVariableExA'],
  [
    Fiddle::TYPE_VOIDP,  # lpName : LPCSTR
    Fiddle::TYPE_VOIDP,  # lpGuid : LPCSTR
    Fiddle::TYPE_VOIDP,  # pBuffer : void* optional, out
    -Fiddle::TYPE_INT,  # nSize : DWORD
    Fiddle::TYPE_VOIDP,  # pdwAttribubutes : DWORD* optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetFirmwareEnvironmentVariableExA(
        lpName: *const u8,  // LPCSTR
        lpGuid: *const u8,  // LPCSTR
        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.Ansi, SetLastError = true)]
public static extern uint GetFirmwareEnvironmentVariableExA([MarshalAs(UnmanagedType.LPStr)] string lpName, [MarshalAs(UnmanagedType.LPStr)] string lpGuid, IntPtr pBuffer, uint nSize, IntPtr pdwAttribubutes);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetFirmwareEnvironmentVariableExA' -Namespace Win32 -PassThru
# $api::GetFirmwareEnvironmentVariableExA(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes)

#uselib "KERNEL32.dll"
#func global GetFirmwareEnvironmentVariableExA "GetFirmwareEnvironmentVariableExA" sptr, sptr, sptr, sptr, sptr
; GetFirmwareEnvironmentVariableExA lpName, lpGuid, pBuffer, nSize, varptr(pdwAttribubutes)   ; 戻り値は stat
; lpName : LPCSTR -> "sptr"
; lpGuid : LPCSTR -> "sptr"
; pBuffer : void* optional, out -> "sptr"
; nSize : DWORD -> "sptr"
; pdwAttribubutes : DWORD* optional, 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。

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetFirmwareEnvironmentVariableExA = kernel32.NewProc("GetFirmwareEnvironmentVariableExA")
)

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

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

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

●GetFirmwareEnvironmentVariableExA(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes) = DLL("KERNEL32.dll", "dword GetFirmwareEnvironmentVariableExA(char*, char*, void*, dword, void*)")
# 呼び出し: GetFirmwareEnvironmentVariableExA(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes)
# lpName : LPCSTR -> "char*"
# lpGuid : LPCSTR -> "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)。

const std = @import("std");

extern "kernel32" fn GetFirmwareEnvironmentVariableExA(
    lpName: [*c]const u8, // LPCSTR
    lpGuid: [*c]const u8, // LPCSTR
    pBuffer: ?*anyopaque, // void* optional, out
    nSize: u32, // DWORD
    pdwAttribubutes: [*c]u32 // DWORD* optional, out
) callconv(std.os.windows.WINAPI) u32;

proc GetFirmwareEnvironmentVariableExA(
    lpName: cstring,  # LPCSTR
    lpGuid: cstring,  # LPCSTR
    pBuffer: pointer,  # void* optional, out
    nSize: uint32,  # DWORD
    pdwAttribubutes: ptr uint32  # DWORD* optional, out
): uint32 {.importc: "GetFirmwareEnvironmentVariableExA", stdcall, dynlib: "KERNEL32.dll".}

pragma(lib, "kernel32");
extern(Windows)
uint GetFirmwareEnvironmentVariableExA(
    const(char)* lpName,   // LPCSTR
    const(char)* lpGuid,   // LPCSTR
    void* pBuffer,   // void* optional, out
    uint nSize,   // DWORD
    uint* pdwAttribubutes   // DWORD* optional, out
);

ccall((:GetFirmwareEnvironmentVariableExA, "KERNEL32.dll"), stdcall, UInt32,
      (Cstring, Cstring, Ptr{Cvoid}, UInt32, Ptr{UInt32}),
      lpName, lpGuid, pBuffer, nSize, pdwAttribubutes)
# lpName : LPCSTR -> Cstring
# lpGuid : LPCSTR -> Cstring
# pBuffer : void* optional, out -> Ptr{Cvoid}
# nSize : DWORD -> UInt32
# pdwAttribubutes : DWORD* optional, out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
uint32_t GetFirmwareEnvironmentVariableExA(
    const char* lpName,
    const char* lpGuid,
    void* pBuffer,
    uint32_t nSize,
    uint32_t* pdwAttribubutes);
]]
local kernel32 = ffi.load("kernel32")
-- kernel32.GetFirmwareEnvironmentVariableExA(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes)
-- lpName : LPCSTR
-- lpGuid : LPCSTR
-- pBuffer : void* optional, out
-- nSize : DWORD
-- pdwAttribubutes : DWORD* optional, out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('KERNEL32.dll');
const GetFirmwareEnvironmentVariableExA = lib.func('__stdcall', 'GetFirmwareEnvironmentVariableExA', 'uint32_t', ['str', 'str', 'void *', 'uint32_t', 'uint32_t *']);
// GetFirmwareEnvironmentVariableExA(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes)
// lpName : LPCSTR -> 'str'
// lpGuid : LPCSTR -> 'str'
// pBuffer : void* optional, out -> 'void *'
// nSize : DWORD -> 'uint32_t'
// pdwAttribubutes : DWORD* optional, out -> 'uint32_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("KERNEL32.dll", {
  GetFirmwareEnvironmentVariableExA: { parameters: ["buffer", "buffer", "pointer", "u32", "pointer"], result: "u32" },
});
// lib.symbols.GetFirmwareEnvironmentVariableExA(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes)
// lpName : LPCSTR -> "buffer"
// lpGuid : LPCSTR -> "buffer"
// pBuffer : void* optional, out -> "pointer"
// nSize : DWORD -> "u32"
// pdwAttribubutes : DWORD* optional, out -> "pointer"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
uint32_t GetFirmwareEnvironmentVariableExA(
    const char* lpName,
    const char* lpGuid,
    void* pBuffer,
    uint32_t nSize,
    uint32_t* pdwAttribubutes);
C, "KERNEL32.dll");
// $ffi->GetFirmwareEnvironmentVariableExA(lpName, lpGuid, pBuffer, nSize, pdwAttribubutes);
// lpName : LPCSTR
// lpGuid : LPCSTR
// pBuffer : void* optional, out
// nSize : DWORD
// pdwAttribubutes : DWORD* optional, out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Kernel32 extends StdCallLibrary {
    Kernel32 INSTANCE = Native.load("kernel32", Kernel32.class, W32APIOptions.ASCII_OPTIONS);
    int GetFirmwareEnvironmentVariableExA(
        String lpName,   // LPCSTR
        String lpGuid,   // LPCSTR
        Pointer pBuffer,   // void* optional, out
        int nSize,   // DWORD
        IntByReference pdwAttribubutes   // DWORD* optional, out
    );
}

@[Link("kernel32")]
lib LibKERNEL32
  fun GetFirmwareEnvironmentVariableExA = GetFirmwareEnvironmentVariableExA(
    lpName : UInt8*,   # LPCSTR
    lpGuid : UInt8*,   # LPCSTR
    pBuffer : Void*,   # void* optional, out
    nSize : UInt32,   # DWORD
    pdwAttribubutes : UInt32*   # DWORD* optional, out
  ) : UInt32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef GetFirmwareEnvironmentVariableExANative = Uint32 Function(Pointer<Utf8>, Pointer<Utf8>, Pointer<Void>, Uint32, Pointer<Uint32>);
typedef GetFirmwareEnvironmentVariableExADart = int Function(Pointer<Utf8>, Pointer<Utf8>, Pointer<Void>, int, Pointer<Uint32>);
final GetFirmwareEnvironmentVariableExA = DynamicLibrary.open('KERNEL32.dll')
    .lookupFunction<GetFirmwareEnvironmentVariableExANative, GetFirmwareEnvironmentVariableExADart>('GetFirmwareEnvironmentVariableExA');
// lpName : LPCSTR -> Pointer<Utf8>
// lpGuid : LPCSTR -> Pointer<Utf8>
// pBuffer : void* optional, out -> Pointer<Void>
// nSize : DWORD -> Uint32
// pdwAttribubutes : DWORD* optional, out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetFirmwareEnvironmentVariableExA(
  lpName: PAnsiChar;   // LPCSTR
  lpGuid: PAnsiChar;   // LPCSTR
  pBuffer: Pointer;   // void* optional, out
  nSize: DWORD;   // DWORD
  pdwAttribubutes: Pointer   // DWORD* optional, out
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetFirmwareEnvironmentVariableExA';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "GetFirmwareEnvironmentVariableExA"
  c_GetFirmwareEnvironmentVariableExA :: CString -> CString -> Ptr () -> Word32 -> Ptr Word32 -> IO Word32
-- lpName : LPCSTR -> CString
-- lpGuid : LPCSTR -> CString
-- pBuffer : void* optional, out -> Ptr ()
-- nSize : DWORD -> Word32
-- pdwAttribubutes : DWORD* optional, out -> Ptr Word32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let getfirmwareenvironmentvariableexa =
  foreign "GetFirmwareEnvironmentVariableExA"
    (string @-> string @-> (ptr void) @-> uint32_t @-> (ptr uint32_t) @-> returning uint32_t)
(* lpName : LPCSTR -> string *)
(* lpGuid : LPCSTR -> string *)
(* pBuffer : void* optional, out -> (ptr void) *)
(* nSize : DWORD -> uint32_t *)
(* pdwAttribubutes : DWORD* optional, out -> (ptr uint32_t) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library kernel32 (t "KERNEL32.dll"))
(cffi:use-foreign-library kernel32)

(cffi:defcfun ("GetFirmwareEnvironmentVariableExA" get-firmware-environment-variable-ex-a :convention :stdcall) :uint32
  (lp-name :string)   ; LPCSTR
  (lp-guid :string)   ; LPCSTR
  (p-buffer :pointer)   ; void* optional, out
  (n-size :uint32)   ; DWORD
  (pdw-attribubutes :pointer))   ; DWORD* optional, out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GetFirmwareEnvironmentVariableExA = Win32::API::More->new('KERNEL32',
    'DWORD GetFirmwareEnvironmentVariableExA(LPCSTR lpName, LPCSTR lpGuid, LPVOID pBuffer, DWORD nSize, LPVOID pdwAttribubutes)');
# my $ret = $GetFirmwareEnvironmentVariableExA->Call($lpName, $lpGuid, $pBuffer, $nSize, $pdwAttribubutes);
# lpName : LPCSTR -> LPCSTR
# lpGuid : LPCSTR -> LPCSTR
# pBuffer : void* optional, out -> LPVOID
# nSize : DWORD -> DWORD
# pdwAttribubutes : DWORD* optional, out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。