ucal_getHostTimeZone

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

INT ucal_getHostTimeZone(
    WORD* result,
    INT resultCapacity,
    UErrorCode* ec
);

<DllImport("icu.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucal_getHostTimeZone(
    ByRef result As UShort,   ' WORD* in/out
    resultCapacity As Integer,   ' INT
    ByRef ec As Integer   ' UErrorCode* in/out
) As Integer
End Function

' result : WORD* in/out
' resultCapacity : INT
' ec : UErrorCode* in/out
Declare PtrSafe Function ucal_getHostTimeZone Lib "icu" ( _
    ByRef result As Integer, _
    ByVal resultCapacity 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

ucal_getHostTimeZone = ctypes.cdll.icu.ucal_getHostTimeZone
ucal_getHostTimeZone.restype = ctypes.c_int
ucal_getHostTimeZone.argtypes = [
    ctypes.POINTER(ctypes.c_ushort),  # result : WORD* in/out
    ctypes.c_int,  # resultCapacity : INT
    ctypes.c_void_p,  # ec : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icu.dll')
ucal_getHostTimeZone = Fiddle::Function.new(
  lib['ucal_getHostTimeZone'],
  [
    Fiddle::TYPE_VOIDP,  # result : WORD* in/out
    Fiddle::TYPE_INT,  # resultCapacity : INT
    Fiddle::TYPE_VOIDP,  # ec : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icu")]
extern "C" {
    fn ucal_getHostTimeZone(
        result: *mut u16,  // WORD* in/out
        resultCapacity: i32,  // INT
        ec: *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 ucal_getHostTimeZone(ref ushort result, int resultCapacity, ref int ec);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icu_ucal_getHostTimeZone' -Namespace Win32 -PassThru
# $api::ucal_getHostTimeZone(result, resultCapacity, ec)

#uselib "icu.dll"
#func global ucal_getHostTimeZone "ucal_getHostTimeZone" sptr, sptr, sptr
; ucal_getHostTimeZone varptr(result), resultCapacity, varptr(ec)   ; 戻り値は stat
; result : WORD* in/out -> "sptr"
; resultCapacity : INT -> "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。

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

var (
	icu = windows.NewLazySystemDLL("icu.dll")
	procucal_getHostTimeZone = icu.NewProc("ucal_getHostTimeZone")
)

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

function ucal_getHostTimeZone(
  result: Pointer;   // WORD* in/out
  resultCapacity: Integer;   // INT
  ec: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icu.dll' name 'ucal_getHostTimeZone';

result := DllCall("icu\ucal_getHostTimeZone"
    , "Ptr", result   ; WORD* in/out
    , "Int", resultCapacity   ; INT
    , "Ptr", ec   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●ucal_getHostTimeZone(result, resultCapacity, ec) = DLL("icu.dll", "int ucal_getHostTimeZone(void*, int, void*)")
# 呼び出し: ucal_getHostTimeZone(result, resultCapacity, ec)
# result : WORD* in/out -> "void*"
# resultCapacity : INT -> "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。

const std = @import("std");

extern "icu" fn ucal_getHostTimeZone(
    result: [*c]u16, // WORD* in/out
    resultCapacity: i32, // INT
    ec: [*c]i32 // UErrorCode* in/out
) callconv(.c) i32;

proc ucal_getHostTimeZone(
    result: ptr uint16,  # WORD* in/out
    resultCapacity: int32,  # INT
    ec: ptr int32  # UErrorCode* in/out
): int32 {.importc: "ucal_getHostTimeZone", cdecl, dynlib: "icu.dll".}

pragma(lib, "icu");
extern(C)
int ucal_getHostTimeZone(
    ushort* result,   // WORD* in/out
    int resultCapacity,   // INT
    int* ec   // UErrorCode* in/out
);

ccall((:ucal_getHostTimeZone, "icu.dll"), Int32,
      (Ptr{UInt16}, Int32, Ptr{Int32}),
      result, resultCapacity, ec)
# result : WORD* in/out -> Ptr{UInt16}
# resultCapacity : INT -> Int32
# ec : UErrorCode* in/out -> Ptr{Int32}

local ffi = require("ffi")
ffi.cdef[[
int32_t ucal_getHostTimeZone(
    uint16_t* result,
    int32_t resultCapacity,
    int32_t* ec);
]]
local icu = ffi.load("icu")
-- icu.ucal_getHostTimeZone(result, resultCapacity, ec)
-- result : WORD* in/out
-- resultCapacity : INT
-- ec : 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 ucal_getHostTimeZone = lib.func('__cdecl', 'ucal_getHostTimeZone', 'int32_t', ['uint16_t *', 'int32_t', 'int32_t *']);
// ucal_getHostTimeZone(result, resultCapacity, ec)
// result : WORD* in/out -> 'uint16_t *'
// resultCapacity : INT -> 'int32_t'
// ec : 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", {
  ucal_getHostTimeZone: { parameters: ["pointer", "i32", "pointer"], result: "i32" },
});
// lib.symbols.ucal_getHostTimeZone(result, resultCapacity, ec)
// result : WORD* in/out -> "pointer"
// resultCapacity : INT -> "i32"
// ec : 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 ucal_getHostTimeZone(
    uint16_t* result,
    int32_t resultCapacity,
    int32_t* ec);
C, "icu.dll");
// $ffi->ucal_getHostTimeZone(result, resultCapacity, ec);
// result : WORD* in/out
// resultCapacity : INT
// ec : 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 ucal_getHostTimeZone(
        ShortByReference result,   // WORD* in/out
        int resultCapacity,   // INT
        IntByReference ec   // UErrorCode* in/out
    );
}

@[Link("icu")]
lib Libicu
  fun ucal_getHostTimeZone = ucal_getHostTimeZone(
    result : UInt16*,   # WORD* in/out
    resultCapacity : Int32,   # INT
    ec : 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 ucal_getHostTimeZoneNative = Int32 Function(Pointer<Uint16>, Int32, Pointer<Int32>);
typedef ucal_getHostTimeZoneDart = int Function(Pointer<Uint16>, int, Pointer<Int32>);
final ucal_getHostTimeZone = DynamicLibrary.open('icu.dll')
    .lookupFunction<ucal_getHostTimeZoneNative, ucal_getHostTimeZoneDart>('ucal_getHostTimeZone');
// result : WORD* in/out -> Pointer<Uint16>
// resultCapacity : INT -> Int32
// ec : UErrorCode* in/out -> Pointer<Int32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function ucal_getHostTimeZone(
  result: Pointer;   // WORD* in/out
  resultCapacity: Integer;   // INT
  ec: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icu.dll' name 'ucal_getHostTimeZone';

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

foreign import ccall safe "ucal_getHostTimeZone"
  c_ucal_getHostTimeZone :: Ptr Word16 -> Int32 -> Ptr Int32 -> IO Int32
-- result : WORD* in/out -> Ptr Word16
-- resultCapacity : INT -> Int32
-- ec : 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 ucal_gethosttimezone =
  foreign "ucal_getHostTimeZone"
    ((ptr uint16_t) @-> int32_t @-> (ptr int32_t) @-> returning int32_t)
(* result : WORD* in/out -> (ptr uint16_t) *)
(* resultCapacity : INT -> int32_t *)
(* ec : 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 ("ucal_getHostTimeZone" ucal-get-host-time-zone :convention :cdecl) :int32
  (result :pointer)   ; WORD* in/out
  (result-capacity :int32)   ; INT
  (ec :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 $ucal_getHostTimeZone = Win32::API::More->new('icu',
    'int ucal_getHostTimeZone(LPVOID result, int resultCapacity, LPVOID ec)');
# my $ret = $ucal_getHostTimeZone->Call($result, $resultCapacity, $ec);
# result : WORD* in/out -> LPVOID
# resultCapacity : INT -> int
# ec : 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。