VerLanguageNameW

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

DWORD VerLanguageNameW(
    DWORD wLang,
    LPWSTR szLang,
    DWORD cchLang
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function VerLanguageNameW(
    wLang As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> szLang As System.Text.StringBuilder,   ' LPWSTR out
    cchLang As UInteger   ' DWORD
) As UInteger
End Function

' wLang : DWORD
' szLang : LPWSTR out
' cchLang : DWORD
Declare PtrSafe Function VerLanguageNameW Lib "kernel32" ( _
    ByVal wLang As Long, _
    ByVal szLang As LongPtr, _
    ByVal cchLang 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

VerLanguageNameW = ctypes.windll.kernel32.VerLanguageNameW
VerLanguageNameW.restype = wintypes.DWORD
VerLanguageNameW.argtypes = [
    wintypes.DWORD,  # wLang : DWORD
    wintypes.LPWSTR,  # szLang : LPWSTR out
    wintypes.DWORD,  # cchLang : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
VerLanguageNameW = Fiddle::Function.new(
  lib['VerLanguageNameW'],
  [
    -Fiddle::TYPE_INT,  # wLang : DWORD
    Fiddle::TYPE_VOIDP,  # szLang : LPWSTR out
    -Fiddle::TYPE_INT,  # cchLang : DWORD
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn VerLanguageNameW(
        wLang: u32,  // DWORD
        szLang: *mut u16,  // LPWSTR out
        cchLang: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode)]
public static extern uint VerLanguageNameW(uint wLang, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder szLang, uint cchLang);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_VerLanguageNameW' -Namespace Win32 -PassThru
# $api::VerLanguageNameW(wLang, szLang, cchLang)

#uselib "KERNEL32.dll"
#func global VerLanguageNameW "VerLanguageNameW" wptr, wptr, wptr
; VerLanguageNameW wLang, varptr(szLang), cchLang   ; 戻り値は stat
; wLang : DWORD -> "wptr"
; szLang : LPWSTR out -> "wptr"
; cchLang : DWORD -> "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 VerLanguageNameW "VerLanguageNameW" int, var, int
; res = VerLanguageNameW(wLang, szLang, cchLang)
; wLang : DWORD -> "int"
; szLang : LPWSTR out -> "var"
; cchLang : DWORD -> "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。

; DWORD VerLanguageNameW(DWORD wLang, LPWSTR szLang, DWORD cchLang)
#uselib "KERNEL32.dll"
#cfunc global VerLanguageNameW "VerLanguageNameW" int, var, int
; res = VerLanguageNameW(wLang, szLang, cchLang)
; wLang : DWORD -> "int"
; szLang : LPWSTR out -> "var"
; cchLang : DWORD -> "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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procVerLanguageNameW = kernel32.NewProc("VerLanguageNameW")
)

// wLang (DWORD), szLang (LPWSTR out), cchLang (DWORD)
r1, _, err := procVerLanguageNameW.Call(
	uintptr(wLang),
	uintptr(szLang),
	uintptr(cchLang),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function VerLanguageNameW(
  wLang: DWORD;   // DWORD
  szLang: PWideChar;   // LPWSTR out
  cchLang: DWORD   // DWORD
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'VerLanguageNameW';

result := DllCall("KERNEL32\VerLanguageNameW"
    , "UInt", wLang   ; DWORD
    , "Ptr", szLang   ; LPWSTR out
    , "UInt", cchLang   ; DWORD
    , "UInt")   ; return: DWORD

●VerLanguageNameW(wLang, szLang, cchLang) = DLL("KERNEL32.dll", "dword VerLanguageNameW(dword, char*, dword)")
# 呼び出し: VerLanguageNameW(wLang, szLang, cchLang)
# wLang : DWORD -> "dword"
# szLang : LPWSTR out -> "char*"
# cchLang : DWORD -> "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。