GetDllDirectoryA

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

DWORD GetDllDirectoryA(
    DWORD nBufferLength,
    LPSTR lpBuffer   // optional
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetDllDirectoryA(
    nBufferLength As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> lpBuffer As System.Text.StringBuilder   ' LPSTR optional, out
) As UInteger
End Function

' nBufferLength : DWORD
' lpBuffer : LPSTR optional, out
Declare PtrSafe Function GetDllDirectoryA Lib "kernel32" ( _
    ByVal nBufferLength As Long, _
    ByVal lpBuffer As String) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetDllDirectoryA = ctypes.windll.kernel32.GetDllDirectoryA
GetDllDirectoryA.restype = wintypes.DWORD
GetDllDirectoryA.argtypes = [
    wintypes.DWORD,  # nBufferLength : DWORD
    wintypes.LPSTR,  # lpBuffer : LPSTR optional, out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetDllDirectoryA = Fiddle::Function.new(
  lib['GetDllDirectoryA'],
  [
    -Fiddle::TYPE_INT,  # nBufferLength : DWORD
    Fiddle::TYPE_VOIDP,  # lpBuffer : LPSTR optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetDllDirectoryA(
        nBufferLength: u32,  // DWORD
        lpBuffer: *mut u8  // LPSTR 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 GetDllDirectoryA(uint nBufferLength, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpBuffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetDllDirectoryA' -Namespace Win32 -PassThru
# $api::GetDllDirectoryA(nBufferLength, lpBuffer)

#uselib "KERNEL32.dll"
#func global GetDllDirectoryA "GetDllDirectoryA" sptr, sptr
; GetDllDirectoryA nBufferLength, varptr(lpBuffer)   ; 戻り値は stat
; nBufferLength : DWORD -> "sptr"
; lpBuffer : LPSTR 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")
	procGetDllDirectoryA = kernel32.NewProc("GetDllDirectoryA")
)

// nBufferLength (DWORD), lpBuffer (LPSTR optional, out)
r1, _, err := procGetDllDirectoryA.Call(
	uintptr(nBufferLength),
	uintptr(lpBuffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetDllDirectoryA(
  nBufferLength: DWORD;   // DWORD
  lpBuffer: PAnsiChar   // LPSTR optional, out
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetDllDirectoryA';

result := DllCall("KERNEL32\GetDllDirectoryA"
    , "UInt", nBufferLength   ; DWORD
    , "Ptr", lpBuffer   ; LPSTR optional, out
    , "UInt")   ; return: DWORD

●GetDllDirectoryA(nBufferLength, lpBuffer) = DLL("KERNEL32.dll", "dword GetDllDirectoryA(dword, char*)")
# 呼び出し: GetDllDirectoryA(nBufferLength, lpBuffer)
# nBufferLength : DWORD -> "dword"
# lpBuffer : LPSTR optional, out -> "char*"
# 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 GetDllDirectoryA(
    nBufferLength: u32, // DWORD
    lpBuffer: [*c]u8 // LPSTR optional, out
) callconv(std.os.windows.WINAPI) u32;

proc GetDllDirectoryA(
    nBufferLength: uint32,  # DWORD
    lpBuffer: ptr char  # LPSTR optional, out
): uint32 {.importc: "GetDllDirectoryA", stdcall, dynlib: "KERNEL32.dll".}

pragma(lib, "kernel32");
extern(Windows)
uint GetDllDirectoryA(
    uint nBufferLength,   // DWORD
    char* lpBuffer   // LPSTR optional, out
);

ccall((:GetDllDirectoryA, "KERNEL32.dll"), stdcall, UInt32,
      (UInt32, Ptr{UInt8}),
      nBufferLength, lpBuffer)
# nBufferLength : DWORD -> UInt32
# lpBuffer : LPSTR optional, out -> Ptr{UInt8}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
uint32_t GetDllDirectoryA(
    uint32_t nBufferLength,
    char* lpBuffer);
]]
local kernel32 = ffi.load("kernel32")
-- kernel32.GetDllDirectoryA(nBufferLength, lpBuffer)
-- nBufferLength : DWORD
-- lpBuffer : LPSTR 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 GetDllDirectoryA = lib.func('__stdcall', 'GetDllDirectoryA', 'uint32_t', ['uint32_t', 'char *']);
// GetDllDirectoryA(nBufferLength, lpBuffer)
// nBufferLength : DWORD -> 'uint32_t'
// lpBuffer : LPSTR optional, out -> 'char *'
// 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", {
  GetDllDirectoryA: { parameters: ["u32", "buffer"], result: "u32" },
});
// lib.symbols.GetDllDirectoryA(nBufferLength, lpBuffer)
// nBufferLength : DWORD -> "u32"
// lpBuffer : LPSTR optional, out -> "buffer"
// 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 GetDllDirectoryA(
    uint32_t nBufferLength,
    char* lpBuffer);
C, "KERNEL32.dll");
// $ffi->GetDllDirectoryA(nBufferLength, lpBuffer);
// nBufferLength : DWORD
// lpBuffer : LPSTR 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 GetDllDirectoryA(
        int nBufferLength,   // DWORD
        byte[] lpBuffer   // LPSTR optional, out
    );
}

@[Link("kernel32")]
lib LibKERNEL32
  fun GetDllDirectoryA = GetDllDirectoryA(
    nBufferLength : UInt32,   # DWORD
    lpBuffer : UInt8*   # LPSTR 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 GetDllDirectoryANative = Uint32 Function(Uint32, Pointer<Utf8>);
typedef GetDllDirectoryADart = int Function(int, Pointer<Utf8>);
final GetDllDirectoryA = DynamicLibrary.open('KERNEL32.dll')
    .lookupFunction<GetDllDirectoryANative, GetDllDirectoryADart>('GetDllDirectoryA');
// nBufferLength : DWORD -> Uint32
// lpBuffer : LPSTR optional, out -> Pointer<Utf8>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetDllDirectoryA(
  nBufferLength: DWORD;   // DWORD
  lpBuffer: PAnsiChar   // LPSTR optional, out
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetDllDirectoryA';

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

foreign import stdcall safe "GetDllDirectoryA"
  c_GetDllDirectoryA :: Word32 -> CString -> IO Word32
-- nBufferLength : DWORD -> Word32
-- lpBuffer : LPSTR optional, out -> CString
-- 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 getdlldirectorya =
  foreign "GetDllDirectoryA"
    (uint32_t @-> string @-> returning uint32_t)
(* nBufferLength : DWORD -> uint32_t *)
(* lpBuffer : LPSTR optional, out -> string *)
(* 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 ("GetDllDirectoryA" get-dll-directory-a :convention :stdcall) :uint32
  (n-buffer-length :uint32)   ; DWORD
  (lp-buffer :pointer))   ; LPSTR optional, out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GetDllDirectoryA = Win32::API::More->new('KERNEL32',
    'DWORD GetDllDirectoryA(DWORD nBufferLength, LPSTR lpBuffer)');
# my $ret = $GetDllDirectoryA->Call($nBufferLength, $lpBuffer);
# nBufferLength : DWORD -> DWORD
# lpBuffer : LPSTR optional, out -> LPSTR
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。