uldn_openForContext

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

ULocaleDisplayNames* uldn_openForContext(
    LPCSTR locale,
    UDisplayContext* contexts,
    INT length,
    UErrorCode* pErrorCode
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function uldn_openForContext(
    <MarshalAs(UnmanagedType.LPStr)> locale As String,   ' LPCSTR
    ByRef contexts As Integer,   ' UDisplayContext* in/out
    length As Integer,   ' INT
    ByRef pErrorCode As Integer   ' UErrorCode* in/out
) As IntPtr
End Function

' locale : LPCSTR
' contexts : UDisplayContext* in/out
' length : INT
' pErrorCode : UErrorCode* in/out
Declare PtrSafe Function uldn_openForContext Lib "icuuc" ( _
    ByVal locale As String, _
    ByRef contexts As Long, _
    ByVal length As Long, _
    ByRef pErrorCode As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

uldn_openForContext = ctypes.cdll.icuuc.uldn_openForContext
uldn_openForContext.restype = ctypes.c_void_p
uldn_openForContext.argtypes = [
    wintypes.LPCSTR,  # locale : LPCSTR
    ctypes.c_void_p,  # contexts : UDisplayContext* in/out
    ctypes.c_int,  # length : INT
    ctypes.c_void_p,  # pErrorCode : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
uldn_openForContext = Fiddle::Function.new(
  lib['uldn_openForContext'],
  [
    Fiddle::TYPE_VOIDP,  # locale : LPCSTR
    Fiddle::TYPE_VOIDP,  # contexts : UDisplayContext* in/out
    Fiddle::TYPE_INT,  # length : INT
    Fiddle::TYPE_VOIDP,  # pErrorCode : UErrorCode* in/out
  ],
  Fiddle::TYPE_VOIDP, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn uldn_openForContext(
        locale: *const u8,  // LPCSTR
        contexts: *mut i32,  // UDisplayContext* in/out
        length: i32,  // INT
        pErrorCode: *mut i32  // UErrorCode* in/out
    ) -> *mut isize;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern IntPtr uldn_openForContext([MarshalAs(UnmanagedType.LPStr)] string locale, ref int contexts, int length, ref int pErrorCode);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_uldn_openForContext' -Namespace Win32 -PassThru
# $api::uldn_openForContext(locale, contexts, length, pErrorCode)

#uselib "icuuc.dll"
#func global uldn_openForContext "uldn_openForContext" sptr, sptr, sptr, sptr
; uldn_openForContext locale, contexts, length, pErrorCode   ; 戻り値は stat
; locale : LPCSTR -> "sptr"
; contexts : UDisplayContext* in/out -> "sptr"
; length : INT -> "sptr"
; pErrorCode : UErrorCode* 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 "icuuc.dll"
#cfunc global uldn_openForContext "uldn_openForContext" str, int, int, int
; res = uldn_openForContext(locale, contexts, length, pErrorCode)
; locale : LPCSTR -> "str"
; contexts : UDisplayContext* in/out -> "int"
; length : INT -> "int"
; pErrorCode : UErrorCode* in/out -> "int"

; ULocaleDisplayNames* uldn_openForContext(LPCSTR locale, UDisplayContext* contexts, INT length, UErrorCode* pErrorCode)
#uselib "icuuc.dll"
#cfunc global uldn_openForContext "uldn_openForContext" str, int, int, int
; res = uldn_openForContext(locale, contexts, length, pErrorCode)
; locale : LPCSTR -> "str"
; contexts : UDisplayContext* in/out -> "int"
; length : INT -> "int"
; pErrorCode : UErrorCode* in/out -> "int"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	proculdn_openForContext = icuuc.NewProc("uldn_openForContext")
)

// locale (LPCSTR), contexts (UDisplayContext* in/out), length (INT), pErrorCode (UErrorCode* in/out)
r1, _, err := proculdn_openForContext.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(locale))),
	uintptr(contexts),
	uintptr(length),
	uintptr(pErrorCode),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // ULocaleDisplayNames*

function uldn_openForContext(
  locale: PAnsiChar;   // LPCSTR
  contexts: Pointer;   // UDisplayContext* in/out
  length: Integer;   // INT
  pErrorCode: Pointer   // UErrorCode* in/out
): Pointer; cdecl;
  external 'icuuc.dll' name 'uldn_openForContext';

result := DllCall("icuuc\uldn_openForContext"
    , "AStr", locale   ; LPCSTR
    , "Ptr", contexts   ; UDisplayContext* in/out
    , "Int", length   ; INT
    , "Ptr", pErrorCode   ; UErrorCode* in/out
    , "Cdecl Ptr")   ; return: ULocaleDisplayNames*

●uldn_openForContext(locale, contexts, length, pErrorCode) = DLL("icuuc.dll", "void* uldn_openForContext(char*, void*, int, void*)")
# 呼び出し: uldn_openForContext(locale, contexts, length, pErrorCode)
# locale : LPCSTR -> "char*"
# contexts : UDisplayContext* in/out -> "void*"
# length : INT -> "int"
# pErrorCode : UErrorCode* 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)。
# ※cdecl関数。DLL()宣言はstdcall前提。cdeclは EXEC_PTR(`cdecl`,…) を使用。