LoadLibraryExW

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

HMODULE LoadLibraryExW(
    LPCWSTR lpLibFileName,
    HANDLE hFile,   // optional
    LOAD_LIBRARY_FLAGS dwFlags
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function LoadLibraryExW(
    <MarshalAs(UnmanagedType.LPWStr)> lpLibFileName As String,   ' LPCWSTR
    hFile As IntPtr,   ' HANDLE optional
    dwFlags As UInteger   ' LOAD_LIBRARY_FLAGS
) As IntPtr
End Function

' lpLibFileName : LPCWSTR
' hFile : HANDLE optional
' dwFlags : LOAD_LIBRARY_FLAGS
Declare PtrSafe Function LoadLibraryExW Lib "kernel32" ( _
    ByVal lpLibFileName As LongPtr, _
    ByVal hFile As LongPtr, _
    ByVal dwFlags As Long) As LongPtr
' 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

LoadLibraryExW = ctypes.windll.kernel32.LoadLibraryExW
LoadLibraryExW.restype = ctypes.c_void_p
LoadLibraryExW.argtypes = [
    wintypes.LPCWSTR,  # lpLibFileName : LPCWSTR
    wintypes.HANDLE,  # hFile : HANDLE optional
    wintypes.DWORD,  # dwFlags : LOAD_LIBRARY_FLAGS
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
LoadLibraryExW = Fiddle::Function.new(
  lib['LoadLibraryExW'],
  [
    Fiddle::TYPE_VOIDP,  # lpLibFileName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # hFile : HANDLE optional
    -Fiddle::TYPE_INT,  # dwFlags : LOAD_LIBRARY_FLAGS
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn LoadLibraryExW(
        lpLibFileName: *const u16,  // LPCWSTR
        hFile: *mut core::ffi::c_void,  // HANDLE optional
        dwFlags: u32  // LOAD_LIBRARY_FLAGS
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr LoadLibraryExW([MarshalAs(UnmanagedType.LPWStr)] string lpLibFileName, IntPtr hFile, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_LoadLibraryExW' -Namespace Win32 -PassThru
# $api::LoadLibraryExW(lpLibFileName, hFile, dwFlags)

#uselib "KERNEL32.dll"
#func global LoadLibraryExW "LoadLibraryExW" wptr, wptr, wptr
; LoadLibraryExW lpLibFileName, hFile, dwFlags   ; 戻り値は stat
; lpLibFileName : LPCWSTR -> "wptr"
; hFile : HANDLE optional -> "wptr"
; dwFlags : LOAD_LIBRARY_FLAGS -> "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 LoadLibraryExW "LoadLibraryExW" wstr, sptr, int
; res = LoadLibraryExW(lpLibFileName, hFile, dwFlags)
; lpLibFileName : LPCWSTR -> "wstr"
; hFile : HANDLE optional -> "sptr"
; dwFlags : LOAD_LIBRARY_FLAGS -> "int"

; HMODULE LoadLibraryExW(LPCWSTR lpLibFileName, HANDLE hFile, LOAD_LIBRARY_FLAGS dwFlags)
#uselib "KERNEL32.dll"
#cfunc global LoadLibraryExW "LoadLibraryExW" wstr, intptr, int
; res = LoadLibraryExW(lpLibFileName, hFile, dwFlags)
; lpLibFileName : LPCWSTR -> "wstr"
; hFile : HANDLE optional -> "intptr"
; dwFlags : LOAD_LIBRARY_FLAGS -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procLoadLibraryExW = kernel32.NewProc("LoadLibraryExW")
)

// lpLibFileName (LPCWSTR), hFile (HANDLE optional), dwFlags (LOAD_LIBRARY_FLAGS)
r1, _, err := procLoadLibraryExW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpLibFileName))),
	uintptr(hFile),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HMODULE

function LoadLibraryExW(
  lpLibFileName: PWideChar;   // LPCWSTR
  hFile: THandle;   // HANDLE optional
  dwFlags: DWORD   // LOAD_LIBRARY_FLAGS
): THandle; stdcall;
  external 'KERNEL32.dll' name 'LoadLibraryExW';

result := DllCall("KERNEL32\LoadLibraryExW"
    , "WStr", lpLibFileName   ; LPCWSTR
    , "Ptr", hFile   ; HANDLE optional
    , "UInt", dwFlags   ; LOAD_LIBRARY_FLAGS
    , "Ptr")   ; return: HMODULE

●LoadLibraryExW(lpLibFileName, hFile, dwFlags) = DLL("KERNEL32.dll", "void* LoadLibraryExW(char*, void*, dword)")
# 呼び出し: LoadLibraryExW(lpLibFileName, hFile, dwFlags)
# lpLibFileName : LPCWSTR -> "char*"
# hFile : HANDLE optional -> "void*"
# dwFlags : 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。