GetUserPreferredUILanguages

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

BOOL GetUserPreferredUILanguages(
    DWORD dwFlags,
    DWORD* pulNumLanguages,
    LPWSTR pwszLanguagesBuffer,   // optional
    DWORD* pcchLanguagesBuffer
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetUserPreferredUILanguages(
    dwFlags As UInteger,   ' DWORD
    <Out> ByRef pulNumLanguages As UInteger,   ' DWORD* out
    <MarshalAs(UnmanagedType.LPWStr)> pwszLanguagesBuffer As System.Text.StringBuilder,   ' LPWSTR optional, out
    ByRef pcchLanguagesBuffer As UInteger   ' DWORD* in/out
) As Boolean
End Function

' dwFlags : DWORD
' pulNumLanguages : DWORD* out
' pwszLanguagesBuffer : LPWSTR optional, out
' pcchLanguagesBuffer : DWORD* in/out
Declare PtrSafe Function GetUserPreferredUILanguages Lib "kernel32" ( _
    ByVal dwFlags As Long, _
    ByRef pulNumLanguages As Long, _
    ByVal pwszLanguagesBuffer As LongPtr, _
    ByRef pcchLanguagesBuffer 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

GetUserPreferredUILanguages = ctypes.windll.kernel32.GetUserPreferredUILanguages
GetUserPreferredUILanguages.restype = wintypes.BOOL
GetUserPreferredUILanguages.argtypes = [
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pulNumLanguages : DWORD* out
    wintypes.LPWSTR,  # pwszLanguagesBuffer : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchLanguagesBuffer : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetUserPreferredUILanguages = Fiddle::Function.new(
  lib['GetUserPreferredUILanguages'],
  [
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pulNumLanguages : DWORD* out
    Fiddle::TYPE_VOIDP,  # pwszLanguagesBuffer : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchLanguagesBuffer : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetUserPreferredUILanguages(
        dwFlags: u32,  // DWORD
        pulNumLanguages: *mut u32,  // DWORD* out
        pwszLanguagesBuffer: *mut u16,  // LPWSTR optional, out
        pcchLanguagesBuffer: *mut u32  // DWORD* in/out
    ) -> 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 GetUserPreferredUILanguages(uint dwFlags, out uint pulNumLanguages, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pwszLanguagesBuffer, ref uint pcchLanguagesBuffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetUserPreferredUILanguages' -Namespace Win32 -PassThru
# $api::GetUserPreferredUILanguages(dwFlags, pulNumLanguages, pwszLanguagesBuffer, pcchLanguagesBuffer)

#uselib "KERNEL32.dll"
#func global GetUserPreferredUILanguages "GetUserPreferredUILanguages" sptr, sptr, sptr, sptr
; GetUserPreferredUILanguages dwFlags, varptr(pulNumLanguages), varptr(pwszLanguagesBuffer), varptr(pcchLanguagesBuffer)   ; 戻り値は stat
; dwFlags : DWORD -> "sptr"
; pulNumLanguages : DWORD* out -> "sptr"
; pwszLanguagesBuffer : LPWSTR optional, out -> "sptr"
; pcchLanguagesBuffer : DWORD* in/out -> "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 GetUserPreferredUILanguages "GetUserPreferredUILanguages" int, var, var, var
; res = GetUserPreferredUILanguages(dwFlags, pulNumLanguages, pwszLanguagesBuffer, pcchLanguagesBuffer)
; dwFlags : DWORD -> "int"
; pulNumLanguages : DWORD* out -> "var"
; pwszLanguagesBuffer : LPWSTR optional, out -> "var"
; pcchLanguagesBuffer : DWORD* in/out -> "var"
; ※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。

; BOOL GetUserPreferredUILanguages(DWORD dwFlags, DWORD* pulNumLanguages, LPWSTR pwszLanguagesBuffer, DWORD* pcchLanguagesBuffer)
#uselib "KERNEL32.dll"
#cfunc global GetUserPreferredUILanguages "GetUserPreferredUILanguages" int, var, var, var
; res = GetUserPreferredUILanguages(dwFlags, pulNumLanguages, pwszLanguagesBuffer, pcchLanguagesBuffer)
; dwFlags : DWORD -> "int"
; pulNumLanguages : DWORD* out -> "var"
; pwszLanguagesBuffer : LPWSTR optional, out -> "var"
; pcchLanguagesBuffer : DWORD* in/out -> "var"
; ※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")
	procGetUserPreferredUILanguages = kernel32.NewProc("GetUserPreferredUILanguages")
)

// dwFlags (DWORD), pulNumLanguages (DWORD* out), pwszLanguagesBuffer (LPWSTR optional, out), pcchLanguagesBuffer (DWORD* in/out)
r1, _, err := procGetUserPreferredUILanguages.Call(
	uintptr(dwFlags),
	uintptr(pulNumLanguages),
	uintptr(pwszLanguagesBuffer),
	uintptr(pcchLanguagesBuffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetUserPreferredUILanguages(
  dwFlags: DWORD;   // DWORD
  pulNumLanguages: Pointer;   // DWORD* out
  pwszLanguagesBuffer: PWideChar;   // LPWSTR optional, out
  pcchLanguagesBuffer: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetUserPreferredUILanguages';

result := DllCall("KERNEL32\GetUserPreferredUILanguages"
    , "UInt", dwFlags   ; DWORD
    , "Ptr", pulNumLanguages   ; DWORD* out
    , "Ptr", pwszLanguagesBuffer   ; LPWSTR optional, out
    , "Ptr", pcchLanguagesBuffer   ; DWORD* in/out
    , "Int")   ; return: BOOL

●GetUserPreferredUILanguages(dwFlags, pulNumLanguages, pwszLanguagesBuffer, pcchLanguagesBuffer) = DLL("KERNEL32.dll", "bool GetUserPreferredUILanguages(dword, void*, char*, void*)")
# 呼び出し: GetUserPreferredUILanguages(dwFlags, pulNumLanguages, pwszLanguagesBuffer, pcchLanguagesBuffer)
# dwFlags : DWORD -> "dword"
# pulNumLanguages : DWORD* out -> "void*"
# pwszLanguagesBuffer : LPWSTR optional, out -> "char*"
# pcchLanguagesBuffer : DWORD* in/out -> "void*"
# 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)。