udatpg_getFieldDisplayName

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

INT udatpg_getFieldDisplayName(
    const void** dtpg,
    UDateTimePatternField field,
    UDateTimePGDisplayWidth width,
    WORD* fieldName,
    INT capacity,
    UErrorCode* pErrorCode
);

<DllImport("icu.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function udatpg_getFieldDisplayName(
    dtpg As IntPtr,   ' void**
    field As Integer,   ' UDateTimePatternField
    width As Integer,   ' UDateTimePGDisplayWidth
    ByRef fieldName As UShort,   ' WORD* in/out
    capacity As Integer,   ' INT
    ByRef pErrorCode As Integer   ' UErrorCode* in/out
) As Integer
End Function

' dtpg : void**
' field : UDateTimePatternField
' width : UDateTimePGDisplayWidth
' fieldName : WORD* in/out
' capacity : INT
' pErrorCode : UErrorCode* in/out
Declare PtrSafe Function udatpg_getFieldDisplayName Lib "icu" ( _
    ByVal dtpg As LongPtr, _
    ByVal field As Long, _
    ByVal width As Long, _
    ByRef fieldName As Integer, _
    ByVal capacity As Long, _
    ByRef pErrorCode 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

udatpg_getFieldDisplayName = ctypes.cdll.icu.udatpg_getFieldDisplayName
udatpg_getFieldDisplayName.restype = ctypes.c_int
udatpg_getFieldDisplayName.argtypes = [
    ctypes.c_void_p,  # dtpg : void**
    ctypes.c_int,  # field : UDateTimePatternField
    ctypes.c_int,  # width : UDateTimePGDisplayWidth
    ctypes.POINTER(ctypes.c_ushort),  # fieldName : WORD* in/out
    ctypes.c_int,  # capacity : INT
    ctypes.c_void_p,  # pErrorCode : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icu.dll')
udatpg_getFieldDisplayName = Fiddle::Function.new(
  lib['udatpg_getFieldDisplayName'],
  [
    Fiddle::TYPE_VOIDP,  # dtpg : void**
    Fiddle::TYPE_INT,  # field : UDateTimePatternField
    Fiddle::TYPE_INT,  # width : UDateTimePGDisplayWidth
    Fiddle::TYPE_VOIDP,  # fieldName : WORD* in/out
    Fiddle::TYPE_INT,  # capacity : INT
    Fiddle::TYPE_VOIDP,  # pErrorCode : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icu")]
extern "C" {
    fn udatpg_getFieldDisplayName(
        dtpg: *const *const (),  // void**
        field: i32,  // UDateTimePatternField
        width: i32,  // UDateTimePGDisplayWidth
        fieldName: *mut u16,  // WORD* in/out
        capacity: i32,  // INT
        pErrorCode: *mut i32  // UErrorCode* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icu.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int udatpg_getFieldDisplayName(IntPtr dtpg, int field, int width, ref ushort fieldName, int capacity, ref int pErrorCode);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icu_udatpg_getFieldDisplayName' -Namespace Win32 -PassThru
# $api::udatpg_getFieldDisplayName(dtpg, field, width, fieldName, capacity, pErrorCode)

#uselib "icu.dll"
#func global udatpg_getFieldDisplayName "udatpg_getFieldDisplayName" sptr, sptr, sptr, sptr, sptr, sptr
; udatpg_getFieldDisplayName dtpg, field, width, varptr(fieldName), capacity, varptr(pErrorCode)   ; 戻り値は stat
; dtpg : void** -> "sptr"
; field : UDateTimePatternField -> "sptr"
; width : UDateTimePGDisplayWidth -> "sptr"
; fieldName : WORD* in/out -> "sptr"
; capacity : 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。

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

var (
	icu = windows.NewLazySystemDLL("icu.dll")
	procudatpg_getFieldDisplayName = icu.NewProc("udatpg_getFieldDisplayName")
)

// dtpg (void**), field (UDateTimePatternField), width (UDateTimePGDisplayWidth), fieldName (WORD* in/out), capacity (INT), pErrorCode (UErrorCode* in/out)
r1, _, err := procudatpg_getFieldDisplayName.Call(
	uintptr(dtpg),
	uintptr(field),
	uintptr(width),
	uintptr(fieldName),
	uintptr(capacity),
	uintptr(pErrorCode),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function udatpg_getFieldDisplayName(
  dtpg: Pointer;   // void**
  field: Integer;   // UDateTimePatternField
  width: Integer;   // UDateTimePGDisplayWidth
  fieldName: Pointer;   // WORD* in/out
  capacity: Integer;   // INT
  pErrorCode: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icu.dll' name 'udatpg_getFieldDisplayName';

result := DllCall("icu\udatpg_getFieldDisplayName"
    , "Ptr", dtpg   ; void**
    , "Int", field   ; UDateTimePatternField
    , "Int", width   ; UDateTimePGDisplayWidth
    , "Ptr", fieldName   ; WORD* in/out
    , "Int", capacity   ; INT
    , "Ptr", pErrorCode   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●udatpg_getFieldDisplayName(dtpg, field, width, fieldName, capacity, pErrorCode) = DLL("icu.dll", "int udatpg_getFieldDisplayName(void*, int, int, void*, int, void*)")
# 呼び出し: udatpg_getFieldDisplayName(dtpg, field, width, fieldName, capacity, pErrorCode)
# dtpg : void** -> "void*"
# field : UDateTimePatternField -> "int"
# width : UDateTimePGDisplayWidth -> "int"
# fieldName : WORD* in/out -> "void*"
# capacity : 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。

const std = @import("std");

extern "icu" fn udatpg_getFieldDisplayName(
    dtpg: ?*anyopaque, // void**
    field: i32, // UDateTimePatternField
    width: i32, // UDateTimePGDisplayWidth
    fieldName: [*c]u16, // WORD* in/out
    capacity: i32, // INT
    pErrorCode: [*c]i32 // UErrorCode* in/out
) callconv(.c) i32;

proc udatpg_getFieldDisplayName(
    dtpg: pointer,  # void**
    field: int32,  # UDateTimePatternField
    width: int32,  # UDateTimePGDisplayWidth
    fieldName: ptr uint16,  # WORD* in/out
    capacity: int32,  # INT
    pErrorCode: ptr int32  # UErrorCode* in/out
): int32 {.importc: "udatpg_getFieldDisplayName", cdecl, dynlib: "icu.dll".}

pragma(lib, "icu");
extern(C)
int udatpg_getFieldDisplayName(
    void** dtpg,   // void**
    int field,   // UDateTimePatternField
    int width,   // UDateTimePGDisplayWidth
    ushort* fieldName,   // WORD* in/out
    int capacity,   // INT
    int* pErrorCode   // UErrorCode* in/out
);

ccall((:udatpg_getFieldDisplayName, "icu.dll"), Int32,
      (Ptr{Cvoid}, Int32, Int32, Ptr{UInt16}, Int32, Ptr{Int32}),
      dtpg, field, width, fieldName, capacity, pErrorCode)
# dtpg : void** -> Ptr{Cvoid}
# field : UDateTimePatternField -> Int32
# width : UDateTimePGDisplayWidth -> Int32
# fieldName : WORD* in/out -> Ptr{UInt16}
# capacity : INT -> Int32
# pErrorCode : UErrorCode* in/out -> Ptr{Int32}

local ffi = require("ffi")
ffi.cdef[[
int32_t udatpg_getFieldDisplayName(
    void** dtpg,
    int32_t field,
    int32_t width,
    uint16_t* fieldName,
    int32_t capacity,
    int32_t* pErrorCode);
]]
local icu = ffi.load("icu")
-- icu.udatpg_getFieldDisplayName(dtpg, field, width, fieldName, capacity, pErrorCode)
-- dtpg : void**
-- field : UDateTimePatternField
-- width : UDateTimePGDisplayWidth
-- fieldName : WORD* in/out
-- capacity : INT
-- pErrorCode : 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('icu.dll');
const udatpg_getFieldDisplayName = lib.func('__cdecl', 'udatpg_getFieldDisplayName', 'int32_t', ['void *', 'int32_t', 'int32_t', 'uint16_t *', 'int32_t', 'int32_t *']);
// udatpg_getFieldDisplayName(dtpg, field, width, fieldName, capacity, pErrorCode)
// dtpg : void** -> 'void *'
// field : UDateTimePatternField -> 'int32_t'
// width : UDateTimePGDisplayWidth -> 'int32_t'
// fieldName : WORD* in/out -> 'uint16_t *'
// capacity : INT -> 'int32_t'
// pErrorCode : 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("icu.dll", {
  udatpg_getFieldDisplayName: { parameters: ["pointer", "i32", "i32", "pointer", "i32", "pointer"], result: "i32" },
});
// lib.symbols.udatpg_getFieldDisplayName(dtpg, field, width, fieldName, capacity, pErrorCode)
// dtpg : void** -> "pointer"
// field : UDateTimePatternField -> "i32"
// width : UDateTimePGDisplayWidth -> "i32"
// fieldName : WORD* in/out -> "pointer"
// capacity : INT -> "i32"
// pErrorCode : 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
int32_t udatpg_getFieldDisplayName(
    void** dtpg,
    int32_t field,
    int32_t width,
    uint16_t* fieldName,
    int32_t capacity,
    int32_t* pErrorCode);
C, "icu.dll");
// $ffi->udatpg_getFieldDisplayName(dtpg, field, width, fieldName, capacity, pErrorCode);
// dtpg : void**
// field : UDateTimePatternField
// width : UDateTimePGDisplayWidth
// fieldName : WORD* in/out
// capacity : INT
// pErrorCode : 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 Icu extends Library {
    Icu INSTANCE = Native.load("icu", Icu.class);
    int udatpg_getFieldDisplayName(
        Pointer dtpg,   // void**
        int field,   // UDateTimePatternField
        int width,   // UDateTimePGDisplayWidth
        ShortByReference fieldName,   // WORD* in/out
        int capacity,   // INT
        IntByReference pErrorCode   // UErrorCode* in/out
    );
}

@[Link("icu")]
lib Libicu
  fun udatpg_getFieldDisplayName = udatpg_getFieldDisplayName(
    dtpg : Void**,   # void**
    field : Int32,   # UDateTimePatternField
    width : Int32,   # UDateTimePGDisplayWidth
    fieldName : UInt16*,   # WORD* in/out
    capacity : Int32,   # INT
    pErrorCode : Int32*   # UErrorCode* in/out
  ) : Int32
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 udatpg_getFieldDisplayNameNative = Int32 Function(Pointer<Void>, Int32, Int32, Pointer<Uint16>, Int32, Pointer<Int32>);
typedef udatpg_getFieldDisplayNameDart = int Function(Pointer<Void>, int, int, Pointer<Uint16>, int, Pointer<Int32>);
final udatpg_getFieldDisplayName = DynamicLibrary.open('icu.dll')
    .lookupFunction<udatpg_getFieldDisplayNameNative, udatpg_getFieldDisplayNameDart>('udatpg_getFieldDisplayName');
// dtpg : void** -> Pointer<Void>
// field : UDateTimePatternField -> Int32
// width : UDateTimePGDisplayWidth -> Int32
// fieldName : WORD* in/out -> Pointer<Uint16>
// capacity : INT -> Int32
// pErrorCode : UErrorCode* in/out -> Pointer<Int32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function udatpg_getFieldDisplayName(
  dtpg: Pointer;   // void**
  field: Integer;   // UDateTimePatternField
  width: Integer;   // UDateTimePGDisplayWidth
  fieldName: Pointer;   // WORD* in/out
  capacity: Integer;   // INT
  pErrorCode: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icu.dll' name 'udatpg_getFieldDisplayName';

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

foreign import ccall safe "udatpg_getFieldDisplayName"
  c_udatpg_getFieldDisplayName :: Ptr () -> Int32 -> Int32 -> Ptr Word16 -> Int32 -> Ptr Int32 -> IO Int32
-- dtpg : void** -> Ptr ()
-- field : UDateTimePatternField -> Int32
-- width : UDateTimePGDisplayWidth -> Int32
-- fieldName : WORD* in/out -> Ptr Word16
-- capacity : INT -> Int32
-- pErrorCode : 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 udatpg_getfielddisplayname =
  foreign "udatpg_getFieldDisplayName"
    ((ptr void) @-> int32_t @-> int32_t @-> (ptr uint16_t) @-> int32_t @-> (ptr int32_t) @-> returning int32_t)
(* dtpg : void** -> (ptr void) *)
(* field : UDateTimePatternField -> int32_t *)
(* width : UDateTimePGDisplayWidth -> int32_t *)
(* fieldName : WORD* in/out -> (ptr uint16_t) *)
(* capacity : INT -> int32_t *)
(* pErrorCode : 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 icu (t "icu.dll"))
(cffi:use-foreign-library icu)

(cffi:defcfun ("udatpg_getFieldDisplayName" udatpg-get-field-display-name :convention :cdecl) :int32
  (dtpg :pointer)   ; void**
  (field :int32)   ; UDateTimePatternField
  (width :int32)   ; UDateTimePGDisplayWidth
  (field-name :pointer)   ; WORD* in/out
  (capacity :int32)   ; INT
  (p-error-code :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 $udatpg_getFieldDisplayName = Win32::API::More->new('icu',
    'int udatpg_getFieldDisplayName(LPVOID dtpg, int field, int width, LPVOID fieldName, int capacity, LPVOID pErrorCode)');
# my $ret = $udatpg_getFieldDisplayName->Call($dtpg, $field, $width, $fieldName, $capacity, $pErrorCode);
# dtpg : void** -> LPVOID
# field : UDateTimePatternField -> int
# width : UDateTimePGDisplayWidth -> int
# fieldName : WORD* in/out -> LPVOID
# capacity : INT -> int
# pErrorCode : 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。