SetDllDirectoryA

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

BOOL SetDllDirectoryA(
    LPCSTR lpPathName   // optional
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetDllDirectoryA(
    <MarshalAs(UnmanagedType.LPStr)> lpPathName As String   ' LPCSTR optional
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' lpPathName : LPCSTR optional
Declare PtrSafe Function SetDllDirectoryA Lib "kernel32" ( _
    ByVal lpPathName 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

SetDllDirectoryA = ctypes.windll.kernel32.SetDllDirectoryA
SetDllDirectoryA.restype = wintypes.BOOL
SetDllDirectoryA.argtypes = [
    wintypes.LPCSTR,  # lpPathName : LPCSTR optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
SetDllDirectoryA = Fiddle::Function.new(
  lib['SetDllDirectoryA'],
  [
    Fiddle::TYPE_VOIDP,  # lpPathName : LPCSTR optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn SetDllDirectoryA(
        lpPathName: *const u8  // LPCSTR optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool SetDllDirectoryA([MarshalAs(UnmanagedType.LPStr)] string lpPathName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_SetDllDirectoryA' -Namespace Win32 -PassThru
# $api::SetDllDirectoryA(lpPathName)

#uselib "KERNEL32.dll"
#func global SetDllDirectoryA "SetDllDirectoryA" sptr
; SetDllDirectoryA lpPathName   ; 戻り値は stat
; lpPathName : LPCSTR optional -> "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 "KERNEL32.dll"
#cfunc global SetDllDirectoryA "SetDllDirectoryA" str
; res = SetDllDirectoryA(lpPathName)
; lpPathName : LPCSTR optional -> "str"

; BOOL SetDllDirectoryA(LPCSTR lpPathName)
#uselib "KERNEL32.dll"
#cfunc global SetDllDirectoryA "SetDllDirectoryA" str
; res = SetDllDirectoryA(lpPathName)
; lpPathName : LPCSTR optional -> "str"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procSetDllDirectoryA = kernel32.NewProc("SetDllDirectoryA")
)

// lpPathName (LPCSTR optional)
r1, _, err := procSetDllDirectoryA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpPathName))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetDllDirectoryA(
  lpPathName: PAnsiChar   // LPCSTR optional
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'SetDllDirectoryA';

result := DllCall("KERNEL32\SetDllDirectoryA"
    , "AStr", lpPathName   ; LPCSTR optional
    , "Int")   ; return: BOOL

●SetDllDirectoryA(lpPathName) = DLL("KERNEL32.dll", "bool SetDllDirectoryA(char*)")
# 呼び出し: SetDllDirectoryA(lpPathName)
# lpPathName : LPCSTR optional -> "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 SetDllDirectoryA(
    lpPathName: [*c]const u8 // LPCSTR optional
) callconv(std.os.windows.WINAPI) i32;

proc SetDllDirectoryA(
    lpPathName: cstring  # LPCSTR optional
): int32 {.importc: "SetDllDirectoryA", stdcall, dynlib: "KERNEL32.dll".}

pragma(lib, "kernel32");
extern(Windows)
int SetDllDirectoryA(
    const(char)* lpPathName   // LPCSTR optional
);

ccall((:SetDllDirectoryA, "KERNEL32.dll"), stdcall, Int32,
      (Cstring,),
      lpPathName)
# lpPathName : LPCSTR optional -> Cstring
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t SetDllDirectoryA(
    const char* lpPathName);
]]
local kernel32 = ffi.load("kernel32")
-- kernel32.SetDllDirectoryA(lpPathName)
-- lpPathName : LPCSTR optional
-- 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 SetDllDirectoryA = lib.func('__stdcall', 'SetDllDirectoryA', 'int32_t', ['str']);
// SetDllDirectoryA(lpPathName)
// lpPathName : LPCSTR optional -> 'str'
// 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", {
  SetDllDirectoryA: { parameters: ["buffer"], result: "i32" },
});
// lib.symbols.SetDllDirectoryA(lpPathName)
// lpPathName : LPCSTR optional -> "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
int32_t SetDllDirectoryA(
    const char* lpPathName);
C, "KERNEL32.dll");
// $ffi->SetDllDirectoryA(lpPathName);
// lpPathName : LPCSTR optional
// 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);
    boolean SetDllDirectoryA(
        String lpPathName   // LPCSTR optional
    );
}

@[Link("kernel32")]
lib LibKERNEL32
  fun SetDllDirectoryA = SetDllDirectoryA(
    lpPathName : UInt8*   # LPCSTR optional
  ) : Int32
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 SetDllDirectoryANative = Int32 Function(Pointer<Utf8>);
typedef SetDllDirectoryADart = int Function(Pointer<Utf8>);
final SetDllDirectoryA = DynamicLibrary.open('KERNEL32.dll')
    .lookupFunction<SetDllDirectoryANative, SetDllDirectoryADart>('SetDllDirectoryA');
// lpPathName : LPCSTR optional -> Pointer<Utf8>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SetDllDirectoryA(
  lpPathName: PAnsiChar   // LPCSTR optional
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'SetDllDirectoryA';

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

foreign import stdcall safe "SetDllDirectoryA"
  c_SetDllDirectoryA :: CString -> IO CInt
-- lpPathName : LPCSTR optional -> 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 setdlldirectorya =
  foreign "SetDllDirectoryA"
    (string @-> returning int32_t)
(* lpPathName : LPCSTR optional -> 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 ("SetDllDirectoryA" set-dll-directory-a :convention :stdcall) :int32
  (lp-path-name :string))   ; LPCSTR optional
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $SetDllDirectoryA = Win32::API::More->new('KERNEL32',
    'BOOL SetDllDirectoryA(LPCSTR lpPathName)');
# my $ret = $SetDllDirectoryA->Call($lpPathName);
# lpPathName : LPCSTR optional -> LPCSTR
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。