LoadStringW

// USER32.dll  (Unicode / -W)
#include <windows.h>

INT LoadStringW(
    HINSTANCE hInstance,   // optional
    DWORD uID,
    LPWSTR lpBuffer,
    INT cchBufferMax
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function LoadStringW(
    hInstance As IntPtr,   ' HINSTANCE optional
    uID As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> lpBuffer As System.Text.StringBuilder,   ' LPWSTR out
    cchBufferMax As Integer   ' INT
) As Integer
End Function

' hInstance : HINSTANCE optional
' uID : DWORD
' lpBuffer : LPWSTR out
' cchBufferMax : INT
Declare PtrSafe Function LoadStringW Lib "user32" ( _
    ByVal hInstance As LongPtr, _
    ByVal uID As Long, _
    ByVal lpBuffer As LongPtr, _
    ByVal cchBufferMax As Long) As Long
' 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

LoadStringW = ctypes.windll.user32.LoadStringW
LoadStringW.restype = ctypes.c_int
LoadStringW.argtypes = [
    wintypes.HANDLE,  # hInstance : HINSTANCE optional
    wintypes.DWORD,  # uID : DWORD
    wintypes.LPWSTR,  # lpBuffer : LPWSTR out
    ctypes.c_int,  # cchBufferMax : INT
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
LoadStringW = Fiddle::Function.new(
  lib['LoadStringW'],
  [
    Fiddle::TYPE_VOIDP,  # hInstance : HINSTANCE optional
    -Fiddle::TYPE_INT,  # uID : DWORD
    Fiddle::TYPE_VOIDP,  # lpBuffer : LPWSTR out
    Fiddle::TYPE_INT,  # cchBufferMax : INT
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn LoadStringW(
        hInstance: *mut core::ffi::c_void,  // HINSTANCE optional
        uID: u32,  // DWORD
        lpBuffer: *mut u16,  // LPWSTR out
        cchBufferMax: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern int LoadStringW(IntPtr hInstance, uint uID, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpBuffer, int cchBufferMax);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_LoadStringW' -Namespace Win32 -PassThru
# $api::LoadStringW(hInstance, uID, lpBuffer, cchBufferMax)

#uselib "USER32.dll"
#func global LoadStringW "LoadStringW" wptr, wptr, wptr, wptr
; LoadStringW hInstance, uID, varptr(lpBuffer), cchBufferMax   ; 戻り値は stat
; hInstance : HINSTANCE optional -> "wptr"
; uID : DWORD -> "wptr"
; lpBuffer : LPWSTR out -> "wptr"
; cchBufferMax : INT -> "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 "USER32.dll"
#cfunc global LoadStringW "LoadStringW" sptr, int, var, int
; res = LoadStringW(hInstance, uID, lpBuffer, cchBufferMax)
; hInstance : HINSTANCE optional -> "sptr"
; uID : DWORD -> "int"
; lpBuffer : LPWSTR out -> "var"
; cchBufferMax : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; INT LoadStringW(HINSTANCE hInstance, DWORD uID, LPWSTR lpBuffer, INT cchBufferMax)
#uselib "USER32.dll"
#cfunc global LoadStringW "LoadStringW" intptr, int, var, int
; res = LoadStringW(hInstance, uID, lpBuffer, cchBufferMax)
; hInstance : HINSTANCE optional -> "intptr"
; uID : DWORD -> "int"
; lpBuffer : LPWSTR out -> "var"
; cchBufferMax : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procLoadStringW = user32.NewProc("LoadStringW")
)

// hInstance (HINSTANCE optional), uID (DWORD), lpBuffer (LPWSTR out), cchBufferMax (INT)
r1, _, err := procLoadStringW.Call(
	uintptr(hInstance),
	uintptr(uID),
	uintptr(lpBuffer),
	uintptr(cchBufferMax),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function LoadStringW(
  hInstance: THandle;   // HINSTANCE optional
  uID: DWORD;   // DWORD
  lpBuffer: PWideChar;   // LPWSTR out
  cchBufferMax: Integer   // INT
): Integer; stdcall;
  external 'USER32.dll' name 'LoadStringW';

result := DllCall("USER32\LoadStringW"
    , "Ptr", hInstance   ; HINSTANCE optional
    , "UInt", uID   ; DWORD
    , "Ptr", lpBuffer   ; LPWSTR out
    , "Int", cchBufferMax   ; INT
    , "Int")   ; return: INT

●LoadStringW(hInstance, uID, lpBuffer, cchBufferMax) = DLL("USER32.dll", "int LoadStringW(void*, dword, char*, int)")
# 呼び出し: LoadStringW(hInstance, uID, lpBuffer, cchBufferMax)
# hInstance : HINSTANCE optional -> "void*"
# uID : DWORD -> "dword"
# lpBuffer : LPWSTR out -> "char*"
# cchBufferMax : INT -> "int"
# 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。