SetDefaultDllDirectories

// KERNEL32.dll
#include <windows.h>

BOOL SetDefaultDllDirectories(
    LOAD_LIBRARY_FLAGS DirectoryFlags
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetDefaultDllDirectories(
    DirectoryFlags As UInteger   ' LOAD_LIBRARY_FLAGS
) As Boolean
End Function

' DirectoryFlags : LOAD_LIBRARY_FLAGS
Declare PtrSafe Function SetDefaultDllDirectories Lib "kernel32" ( _
    ByVal DirectoryFlags As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SetDefaultDllDirectories = ctypes.windll.kernel32.SetDefaultDllDirectories
SetDefaultDllDirectories.restype = wintypes.BOOL
SetDefaultDllDirectories.argtypes = [
    wintypes.DWORD,  # DirectoryFlags : LOAD_LIBRARY_FLAGS
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
SetDefaultDllDirectories = Fiddle::Function.new(
  lib['SetDefaultDllDirectories'],
  [
    -Fiddle::TYPE_INT,  # DirectoryFlags : LOAD_LIBRARY_FLAGS
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn SetDefaultDllDirectories(
        DirectoryFlags: u32  // LOAD_LIBRARY_FLAGS
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern bool SetDefaultDllDirectories(uint DirectoryFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_SetDefaultDllDirectories' -Namespace Win32 -PassThru
# $api::SetDefaultDllDirectories(DirectoryFlags)

#uselib "KERNEL32.dll"
#func global SetDefaultDllDirectories "SetDefaultDllDirectories" sptr
; SetDefaultDllDirectories DirectoryFlags   ; 戻り値は stat
; DirectoryFlags : LOAD_LIBRARY_FLAGS -> "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 SetDefaultDllDirectories "SetDefaultDllDirectories" int
; res = SetDefaultDllDirectories(DirectoryFlags)
; DirectoryFlags : LOAD_LIBRARY_FLAGS -> "int"

; BOOL SetDefaultDllDirectories(LOAD_LIBRARY_FLAGS DirectoryFlags)
#uselib "KERNEL32.dll"
#cfunc global SetDefaultDllDirectories "SetDefaultDllDirectories" int
; res = SetDefaultDllDirectories(DirectoryFlags)
; DirectoryFlags : LOAD_LIBRARY_FLAGS -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procSetDefaultDllDirectories = kernel32.NewProc("SetDefaultDllDirectories")
)

// DirectoryFlags (LOAD_LIBRARY_FLAGS)
r1, _, err := procSetDefaultDllDirectories.Call(
	uintptr(DirectoryFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetDefaultDllDirectories(
  DirectoryFlags: DWORD   // LOAD_LIBRARY_FLAGS
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'SetDefaultDllDirectories';

result := DllCall("KERNEL32\SetDefaultDllDirectories"
    , "UInt", DirectoryFlags   ; LOAD_LIBRARY_FLAGS
    , "Int")   ; return: BOOL

●SetDefaultDllDirectories(DirectoryFlags) = DLL("KERNEL32.dll", "bool SetDefaultDllDirectories(dword)")
# 呼び出し: SetDefaultDllDirectories(DirectoryFlags)
# DirectoryFlags : LOAD_LIBRARY_FLAGS -> "dword"
# 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)。