udat_get2DigitYearStart

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

DOUBLE udat_get2DigitYearStart(
    const void** fmt,
    UErrorCode* status
);

<DllImport("icuin.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function udat_get2DigitYearStart(
    fmt As IntPtr,   ' void**
    ByRef status As Integer   ' UErrorCode* in/out
) As Double
End Function

' fmt : void**
' status : UErrorCode* in/out
Declare PtrSafe Function udat_get2DigitYearStart Lib "icuin" ( _
    ByVal fmt As LongPtr, _
    ByRef status As Long) As Double
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

udat_get2DigitYearStart = ctypes.cdll.icuin.udat_get2DigitYearStart
udat_get2DigitYearStart.restype = ctypes.c_double
udat_get2DigitYearStart.argtypes = [
    ctypes.c_void_p,  # fmt : void**
    ctypes.c_void_p,  # status : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuin.dll')
udat_get2DigitYearStart = Fiddle::Function.new(
  lib['udat_get2DigitYearStart'],
  [
    Fiddle::TYPE_VOIDP,  # fmt : void**
    Fiddle::TYPE_VOIDP,  # status : UErrorCode* in/out
  ],
  Fiddle::TYPE_DOUBLE, Fiddle::Function::CDECL)

#[link(name = "icuin")]
extern "C" {
    fn udat_get2DigitYearStart(
        fmt: *const *const (),  // void**
        status: *mut i32  // UErrorCode* in/out
    ) -> f64;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuin.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern double udat_get2DigitYearStart(IntPtr fmt, ref int status);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuin_udat_get2DigitYearStart' -Namespace Win32 -PassThru
# $api::udat_get2DigitYearStart(fmt, status)

#uselib "icuin.dll"
#func global udat_get2DigitYearStart "udat_get2DigitYearStart" sptr, sptr
; udat_get2DigitYearStart fmt, varptr(status)   ; 戻り値は stat
; fmt : void** -> "sptr"
; status : 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。

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

var (
	icuin = windows.NewLazySystemDLL("icuin.dll")
	procudat_get2DigitYearStart = icuin.NewProc("udat_get2DigitYearStart")
)

// fmt (void**), status (UErrorCode* in/out)
r1, _, err := procudat_get2DigitYearStart.Call(
	uintptr(fmt),
	uintptr(status),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DOUBLE

function udat_get2DigitYearStart(
  fmt: Pointer;   // void**
  status: Pointer   // UErrorCode* in/out
): Double; cdecl;
  external 'icuin.dll' name 'udat_get2DigitYearStart';

result := DllCall("icuin\udat_get2DigitYearStart"
    , "Ptr", fmt   ; void**
    , "Ptr", status   ; UErrorCode* in/out
    , "Cdecl Double")   ; return: DOUBLE

●udat_get2DigitYearStart(fmt, status) = DLL("icuin.dll", "double udat_get2DigitYearStart(void*, void*)")
# 呼び出し: udat_get2DigitYearStart(fmt, status)
# fmt : void** -> "void*"
# status : 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。

const std = @import("std");

extern "icuin" fn udat_get2DigitYearStart(
    fmt: ?*anyopaque, // void**
    status: [*c]i32 // UErrorCode* in/out
) callconv(.c) f64;

proc udat_get2DigitYearStart(
    fmt: pointer,  # void**
    status: ptr int32  # UErrorCode* in/out
): float64 {.importc: "udat_get2DigitYearStart", cdecl, dynlib: "icuin.dll".}

pragma(lib, "icuin");
extern(C)
double udat_get2DigitYearStart(
    void** fmt,   // void**
    int* status   // UErrorCode* in/out
);

ccall((:udat_get2DigitYearStart, "icuin.dll"), Float64,
      (Ptr{Cvoid}, Ptr{Int32}),
      fmt, status)
# fmt : void** -> Ptr{Cvoid}
# status : UErrorCode* in/out -> Ptr{Int32}

local ffi = require("ffi")
ffi.cdef[[
double udat_get2DigitYearStart(
    void** fmt,
    int32_t* status);
]]
local icuin = ffi.load("icuin")
-- icuin.udat_get2DigitYearStart(fmt, status)
-- fmt : void**
-- status : UErrorCode* in/out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('icuin.dll');
const udat_get2DigitYearStart = lib.func('__cdecl', 'udat_get2DigitYearStart', 'double', ['void *', 'int32_t *']);
// udat_get2DigitYearStart(fmt, status)
// fmt : void** -> 'void *'
// status : UErrorCode* in/out -> 'int32_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("icuin.dll", {
  udat_get2DigitYearStart: { parameters: ["pointer", "pointer"], result: "f64" },
});
// lib.symbols.udat_get2DigitYearStart(fmt, status)
// fmt : void** -> "pointer"
// status : UErrorCode* in/out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
double udat_get2DigitYearStart(
    void** fmt,
    int32_t* status);
C, "icuin.dll");
// $ffi->udat_get2DigitYearStart(fmt, status);
// fmt : void**
// status : UErrorCode* in/out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Icuin extends Library {
    Icuin INSTANCE = Native.load("icuin", Icuin.class);
    double udat_get2DigitYearStart(
        Pointer fmt,   // void**
        IntByReference status   // UErrorCode* in/out
    );
}

@[Link("icuin")]
lib Libicuin
  fun udat_get2DigitYearStart = udat_get2DigitYearStart(
    fmt : Void**,   # void**
    status : Int32*   # UErrorCode* in/out
  ) : Float64
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef udat_get2DigitYearStartNative = Double Function(Pointer<Void>, Pointer<Int32>);
typedef udat_get2DigitYearStartDart = double Function(Pointer<Void>, Pointer<Int32>);
final udat_get2DigitYearStart = DynamicLibrary.open('icuin.dll')
    .lookupFunction<udat_get2DigitYearStartNative, udat_get2DigitYearStartDart>('udat_get2DigitYearStart');
// fmt : void** -> Pointer<Void>
// status : UErrorCode* in/out -> Pointer<Int32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function udat_get2DigitYearStart(
  fmt: Pointer;   // void**
  status: Pointer   // UErrorCode* in/out
): Double; cdecl;
  external 'icuin.dll' name 'udat_get2DigitYearStart';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import ccall safe "udat_get2DigitYearStart"
  c_udat_get2DigitYearStart :: Ptr () -> Ptr Int32 -> IO CDouble
-- fmt : void** -> Ptr ()
-- status : UErrorCode* in/out -> Ptr Int32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let udat_get2digityearstart =
  foreign "udat_get2DigitYearStart"
    ((ptr void) @-> (ptr int32_t) @-> returning double)
(* fmt : void** -> (ptr void) *)
(* status : UErrorCode* in/out -> (ptr int32_t) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library icuin (t "icuin.dll"))
(cffi:use-foreign-library icuin)

(cffi:defcfun ("udat_get2DigitYearStart" udat-get2-digit-year-start :convention :cdecl) :double
  (fmt :pointer)   ; void**
  (status :pointer))   ; UErrorCode* in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $udat_get2DigitYearStart = Win32::API::More->new('icuin',
    'double udat_get2DigitYearStart(LPVOID fmt, LPVOID status)');
# my $ret = $udat_get2DigitYearStart->Call($fmt, $status);
# fmt : void** -> LPVOID
# status : UErrorCode* in/out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。