GetAcceptLanguagesW

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

HRESULT GetAcceptLanguagesW(
    LPWSTR pszLanguages,
    DWORD* pcchLanguages
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function GetAcceptLanguagesW(
    <MarshalAs(UnmanagedType.LPWStr)> pszLanguages As System.Text.StringBuilder,   ' LPWSTR out
    ByRef pcchLanguages As UInteger   ' DWORD* in/out
) As Integer
End Function

' pszLanguages : LPWSTR out
' pcchLanguages : DWORD* in/out
Declare PtrSafe Function GetAcceptLanguagesW Lib "shlwapi" ( _
    ByVal pszLanguages As LongPtr, _
    ByRef pcchLanguages 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

GetAcceptLanguagesW = ctypes.windll.shlwapi.GetAcceptLanguagesW
GetAcceptLanguagesW.restype = ctypes.c_int
GetAcceptLanguagesW.argtypes = [
    wintypes.LPWSTR,  # pszLanguages : LPWSTR out
    ctypes.POINTER(wintypes.DWORD),  # pcchLanguages : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
GetAcceptLanguagesW = Fiddle::Function.new(
  lib['GetAcceptLanguagesW'],
  [
    Fiddle::TYPE_VOIDP,  # pszLanguages : LPWSTR out
    Fiddle::TYPE_VOIDP,  # pcchLanguages : DWORD* in/out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shlwapi")]
extern "system" {
    fn GetAcceptLanguagesW(
        pszLanguages: *mut u16,  // LPWSTR out
        pcchLanguages: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll", CharSet = CharSet.Unicode)]
public static extern int GetAcceptLanguagesW([MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pszLanguages, ref uint pcchLanguages);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_GetAcceptLanguagesW' -Namespace Win32 -PassThru
# $api::GetAcceptLanguagesW(pszLanguages, pcchLanguages)

#uselib "SHLWAPI.dll"
#func global GetAcceptLanguagesW "GetAcceptLanguagesW" wptr, wptr
; GetAcceptLanguagesW varptr(pszLanguages), varptr(pcchLanguages)   ; 戻り値は stat
; pszLanguages : LPWSTR out -> "wptr"
; pcchLanguages : DWORD* in/out -> "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 "SHLWAPI.dll"
#cfunc global GetAcceptLanguagesW "GetAcceptLanguagesW" var, var
; res = GetAcceptLanguagesW(pszLanguages, pcchLanguages)
; pszLanguages : LPWSTR out -> "var"
; pcchLanguages : 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。

; HRESULT GetAcceptLanguagesW(LPWSTR pszLanguages, DWORD* pcchLanguages)
#uselib "SHLWAPI.dll"
#cfunc global GetAcceptLanguagesW "GetAcceptLanguagesW" var, var
; res = GetAcceptLanguagesW(pszLanguages, pcchLanguages)
; pszLanguages : LPWSTR out -> "var"
; pcchLanguages : 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 (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procGetAcceptLanguagesW = shlwapi.NewProc("GetAcceptLanguagesW")
)

// pszLanguages (LPWSTR out), pcchLanguages (DWORD* in/out)
r1, _, err := procGetAcceptLanguagesW.Call(
	uintptr(pszLanguages),
	uintptr(pcchLanguages),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function GetAcceptLanguagesW(
  pszLanguages: PWideChar;   // LPWSTR out
  pcchLanguages: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'SHLWAPI.dll' name 'GetAcceptLanguagesW';

result := DllCall("SHLWAPI\GetAcceptLanguagesW"
    , "Ptr", pszLanguages   ; LPWSTR out
    , "Ptr", pcchLanguages   ; DWORD* in/out
    , "Int")   ; return: HRESULT

●GetAcceptLanguagesW(pszLanguages, pcchLanguages) = DLL("SHLWAPI.dll", "int GetAcceptLanguagesW(char*, void*)")
# 呼び出し: GetAcceptLanguagesW(pszLanguages, pcchLanguages)
# pszLanguages : LPWSTR out -> "char*"
# pcchLanguages : 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。