ucurr_getDefaultFractionDigitsForUsage

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

INT ucurr_getDefaultFractionDigitsForUsage(
    const WORD* currency,
    UCurrencyUsage usage,
    UErrorCode* ec
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucurr_getDefaultFractionDigitsForUsage(
    ByRef currency As UShort,   ' WORD*
    usage As Integer,   ' UCurrencyUsage
    ByRef ec As Integer   ' UErrorCode* in/out
) As Integer
End Function

' currency : WORD*
' usage : UCurrencyUsage
' ec : UErrorCode* in/out
Declare PtrSafe Function ucurr_getDefaultFractionDigitsForUsage Lib "icuuc" ( _
    ByRef currency As Integer, _
    ByVal usage As Long, _
    ByRef ec 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

ucurr_getDefaultFractionDigitsForUsage = ctypes.cdll.icuuc.ucurr_getDefaultFractionDigitsForUsage
ucurr_getDefaultFractionDigitsForUsage.restype = ctypes.c_int
ucurr_getDefaultFractionDigitsForUsage.argtypes = [
    ctypes.POINTER(ctypes.c_ushort),  # currency : WORD*
    ctypes.c_int,  # usage : UCurrencyUsage
    ctypes.c_void_p,  # ec : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucurr_getDefaultFractionDigitsForUsage = Fiddle::Function.new(
  lib['ucurr_getDefaultFractionDigitsForUsage'],
  [
    Fiddle::TYPE_VOIDP,  # currency : WORD*
    Fiddle::TYPE_INT,  # usage : UCurrencyUsage
    Fiddle::TYPE_VOIDP,  # ec : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucurr_getDefaultFractionDigitsForUsage(
        currency: *const u16,  // WORD*
        usage: i32,  // UCurrencyUsage
        ec: *mut i32  // UErrorCode* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int ucurr_getDefaultFractionDigitsForUsage(ref ushort currency, int usage, ref int ec);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucurr_getDefaultFractionDigitsForUsage' -Namespace Win32 -PassThru
# $api::ucurr_getDefaultFractionDigitsForUsage(currency, usage, ec)

#uselib "icuuc.dll"
#func global ucurr_getDefaultFractionDigitsForUsage "ucurr_getDefaultFractionDigitsForUsage" sptr, sptr, sptr
; ucurr_getDefaultFractionDigitsForUsage varptr(currency), usage, ec   ; 戻り値は stat
; currency : WORD* -> "sptr"
; usage : UCurrencyUsage -> "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_getDefaultFractionDigitsForUsage "ucurr_getDefaultFractionDigitsForUsage" var, int, int
; res = ucurr_getDefaultFractionDigitsForUsage(currency, usage, ec)
; currency : WORD* -> "var"
; usage : UCurrencyUsage -> "int"
; 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。

; INT ucurr_getDefaultFractionDigitsForUsage(WORD* currency, UCurrencyUsage usage, UErrorCode* ec)
#uselib "icuuc.dll"
#cfunc global ucurr_getDefaultFractionDigitsForUsage "ucurr_getDefaultFractionDigitsForUsage" var, int, int
; res = ucurr_getDefaultFractionDigitsForUsage(currency, usage, ec)
; currency : WORD* -> "var"
; usage : UCurrencyUsage -> "int"
; 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_getDefaultFractionDigitsForUsage = icuuc.NewProc("ucurr_getDefaultFractionDigitsForUsage")
)

// currency (WORD*), usage (UCurrencyUsage), ec (UErrorCode* in/out)
r1, _, err := procucurr_getDefaultFractionDigitsForUsage.Call(
	uintptr(currency),
	uintptr(usage),
	uintptr(ec),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function ucurr_getDefaultFractionDigitsForUsage(
  currency: Pointer;   // WORD*
  usage: Integer;   // UCurrencyUsage
  ec: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icuuc.dll' name 'ucurr_getDefaultFractionDigitsForUsage';

result := DllCall("icuuc\ucurr_getDefaultFractionDigitsForUsage"
    , "Ptr", currency   ; WORD*
    , "Int", usage   ; UCurrencyUsage
    , "Ptr", ec   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●ucurr_getDefaultFractionDigitsForUsage(currency, usage, ec) = DLL("icuuc.dll", "int ucurr_getDefaultFractionDigitsForUsage(void*, int, void*)")
# 呼び出し: ucurr_getDefaultFractionDigitsForUsage(currency, usage, ec)
# currency : WORD* -> "void*"
# usage : UCurrencyUsage -> "int"
# 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。