ucurr_getName

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

WORD* ucurr_getName(
    const WORD* currency,
    LPCSTR locale,
    UCurrNameStyle nameStyle,
    CHAR* isChoiceFormat,
    INT* len,
    UErrorCode* ec
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucurr_getName(
    ByRef currency As UShort,   ' WORD*
    <MarshalAs(UnmanagedType.LPStr)> locale As String,   ' LPCSTR
    nameStyle As Integer,   ' UCurrNameStyle
    isChoiceFormat As IntPtr,   ' CHAR* in/out
    ByRef len As Integer,   ' INT* in/out
    ByRef ec As Integer   ' UErrorCode* in/out
) As IntPtr
End Function

' currency : WORD*
' locale : LPCSTR
' nameStyle : UCurrNameStyle
' isChoiceFormat : CHAR* in/out
' len : INT* in/out
' ec : UErrorCode* in/out
Declare PtrSafe Function ucurr_getName Lib "icuuc" ( _
    ByRef currency As Integer, _
    ByVal locale As String, _
    ByVal nameStyle As Long, _
    ByVal isChoiceFormat As LongPtr, _
    ByRef len As Long, _
    ByRef ec 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

ucurr_getName = ctypes.cdll.icuuc.ucurr_getName
ucurr_getName.restype = ctypes.c_void_p
ucurr_getName.argtypes = [
    ctypes.POINTER(ctypes.c_ushort),  # currency : WORD*
    wintypes.LPCSTR,  # locale : LPCSTR
    ctypes.c_int,  # nameStyle : UCurrNameStyle
    ctypes.POINTER(ctypes.c_byte),  # isChoiceFormat : CHAR* in/out
    ctypes.POINTER(ctypes.c_int),  # len : INT* in/out
    ctypes.c_void_p,  # ec : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucurr_getName = Fiddle::Function.new(
  lib['ucurr_getName'],
  [
    Fiddle::TYPE_VOIDP,  # currency : WORD*
    Fiddle::TYPE_VOIDP,  # locale : LPCSTR
    Fiddle::TYPE_INT,  # nameStyle : UCurrNameStyle
    Fiddle::TYPE_VOIDP,  # isChoiceFormat : CHAR* in/out
    Fiddle::TYPE_VOIDP,  # len : INT* in/out
    Fiddle::TYPE_VOIDP,  # ec : UErrorCode* in/out
  ],
  Fiddle::TYPE_VOIDP, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucurr_getName(
        currency: *const u16,  // WORD*
        locale: *const u8,  // LPCSTR
        nameStyle: i32,  // UCurrNameStyle
        isChoiceFormat: *mut i8,  // CHAR* in/out
        len: *mut i32,  // INT* in/out
        ec: *mut i32  // UErrorCode* in/out
    ) -> *mut u16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern IntPtr ucurr_getName(ref ushort currency, [MarshalAs(UnmanagedType.LPStr)] string locale, int nameStyle, IntPtr isChoiceFormat, ref int len, ref int ec);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucurr_getName' -Namespace Win32 -PassThru
# $api::ucurr_getName(currency, locale, nameStyle, isChoiceFormat, len, ec)

#uselib "icuuc.dll"
#func global ucurr_getName "ucurr_getName" sptr, sptr, sptr, sptr, sptr, sptr
; ucurr_getName varptr(currency), locale, nameStyle, varptr(isChoiceFormat), varptr(len), ec   ; 戻り値は stat
; currency : WORD* -> "sptr"
; locale : LPCSTR -> "sptr"
; nameStyle : UCurrNameStyle -> "sptr"
; isChoiceFormat : CHAR* in/out -> "sptr"
; len : INT* in/out -> "sptr"
; ec : 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 ucurr_getName "ucurr_getName" var, str, int, var, var, int
; res = ucurr_getName(currency, locale, nameStyle, isChoiceFormat, len, ec)
; currency : WORD* -> "var"
; locale : LPCSTR -> "str"
; nameStyle : UCurrNameStyle -> "int"
; isChoiceFormat : CHAR* in/out -> "var"
; len : INT* in/out -> "var"
; ec : UErrorCode* in/out -> "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。

; WORD* ucurr_getName(WORD* currency, LPCSTR locale, UCurrNameStyle nameStyle, CHAR* isChoiceFormat, INT* len, UErrorCode* ec)
#uselib "icuuc.dll"
#cfunc global ucurr_getName "ucurr_getName" var, str, int, var, var, int
; res = ucurr_getName(currency, locale, nameStyle, isChoiceFormat, len, ec)
; currency : WORD* -> "var"
; locale : LPCSTR -> "str"
; nameStyle : UCurrNameStyle -> "int"
; isChoiceFormat : CHAR* in/out -> "var"
; len : INT* in/out -> "var"
; ec : UErrorCode* in/out -> "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 (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucurr_getName = icuuc.NewProc("ucurr_getName")
)

// currency (WORD*), locale (LPCSTR), nameStyle (UCurrNameStyle), isChoiceFormat (CHAR* in/out), len (INT* in/out), ec (UErrorCode* in/out)
r1, _, err := procucurr_getName.Call(
	uintptr(currency),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(locale))),
	uintptr(nameStyle),
	uintptr(isChoiceFormat),
	uintptr(len),
	uintptr(ec),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WORD*

function ucurr_getName(
  currency: Pointer;   // WORD*
  locale: PAnsiChar;   // LPCSTR
  nameStyle: Integer;   // UCurrNameStyle
  isChoiceFormat: Pointer;   // CHAR* in/out
  len: Pointer;   // INT* in/out
  ec: Pointer   // UErrorCode* in/out
): Pointer; cdecl;
  external 'icuuc.dll' name 'ucurr_getName';

result := DllCall("icuuc\ucurr_getName"
    , "Ptr", currency   ; WORD*
    , "AStr", locale   ; LPCSTR
    , "Int", nameStyle   ; UCurrNameStyle
    , "Ptr", isChoiceFormat   ; CHAR* in/out
    , "Ptr", len   ; INT* in/out
    , "Ptr", ec   ; UErrorCode* in/out
    , "Cdecl Ptr")   ; return: WORD*

●ucurr_getName(currency, locale, nameStyle, isChoiceFormat, len, ec) = DLL("icuuc.dll", "void* ucurr_getName(void*, char*, int, void*, void*, void*)")
# 呼び出し: ucurr_getName(currency, locale, nameStyle, isChoiceFormat, len, ec)
# currency : WORD* -> "void*"
# locale : LPCSTR -> "char*"
# nameStyle : UCurrNameStyle -> "int"
# isChoiceFormat : CHAR* in/out -> "void*"
# len : INT* in/out -> "void*"
# ec : 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。