ucal_get

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

INT ucal_get(
    const void** cal,
    UCalendarDateFields field,
    UErrorCode* status
);

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

' cal : void**
' field : UCalendarDateFields
' status : UErrorCode* in/out
Declare PtrSafe Function ucal_get Lib "icuin" ( _
    ByVal cal As LongPtr, _
    ByVal field As Long, _
    ByRef status 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_get = ctypes.cdll.icuin.ucal_get
ucal_get.restype = ctypes.c_int
ucal_get.argtypes = [
    ctypes.c_void_p,  # cal : void**
    ctypes.c_int,  # field : UCalendarDateFields
    ctypes.c_void_p,  # status : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuin.dll')
ucal_get = Fiddle::Function.new(
  lib['ucal_get'],
  [
    Fiddle::TYPE_VOIDP,  # cal : void**
    Fiddle::TYPE_INT,  # field : UCalendarDateFields
    Fiddle::TYPE_VOIDP,  # status : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

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

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

#uselib "icuin.dll"
#func global ucal_get "ucal_get" sptr, sptr, sptr
; ucal_get cal, field, varptr(status)   ; 戻り値は stat
; cal : void** -> "sptr"
; field : UCalendarDateFields -> "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")
	procucal_get = icuin.NewProc("ucal_get")
)

// cal (void**), field (UCalendarDateFields), status (UErrorCode* in/out)
r1, _, err := procucal_get.Call(
	uintptr(cal),
	uintptr(field),
	uintptr(status),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function ucal_get(
  cal: Pointer;   // void**
  field: Integer;   // UCalendarDateFields
  status: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icuin.dll' name 'ucal_get';

result := DllCall("icuin\ucal_get"
    , "Ptr", cal   ; void**
    , "Int", field   ; UCalendarDateFields
    , "Ptr", status   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●ucal_get(cal, field, status) = DLL("icuin.dll", "int ucal_get(void*, int, void*)")
# 呼び出し: ucal_get(cal, field, status)
# cal : void** -> "void*"
# field : UCalendarDateFields -> "int"
# 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 ucal_get(
    cal: ?*anyopaque, // void**
    field: i32, // UCalendarDateFields
    status: [*c]i32 // UErrorCode* in/out
) callconv(.c) i32;

proc ucal_get(
    cal: pointer,  # void**
    field: int32,  # UCalendarDateFields
    status: ptr int32  # UErrorCode* in/out
): int32 {.importc: "ucal_get", cdecl, dynlib: "icuin.dll".}

pragma(lib, "icuin");
extern(C)
int ucal_get(
    void** cal,   // void**
    int field,   // UCalendarDateFields
    int* status   // UErrorCode* in/out
);

ccall((:ucal_get, "icuin.dll"), Int32,
      (Ptr{Cvoid}, Int32, Ptr{Int32}),
      cal, field, status)
# cal : void** -> Ptr{Cvoid}
# field : UCalendarDateFields -> Int32
# status : UErrorCode* in/out -> Ptr{Int32}

local ffi = require("ffi")
ffi.cdef[[
int32_t ucal_get(
    void** cal,
    int32_t field,
    int32_t* status);
]]
local icuin = ffi.load("icuin")
-- icuin.ucal_get(cal, field, status)
-- cal : void**
-- field : UCalendarDateFields
-- 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 ucal_get = lib.func('__cdecl', 'ucal_get', 'int32_t', ['void *', 'int32_t', 'int32_t *']);
// ucal_get(cal, field, status)
// cal : void** -> 'void *'
// field : UCalendarDateFields -> 'int32_t'
// 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", {
  ucal_get: { parameters: ["pointer", "i32", "pointer"], result: "i32" },
});
// lib.symbols.ucal_get(cal, field, status)
// cal : void** -> "pointer"
// field : UCalendarDateFields -> "i32"
// 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
int32_t ucal_get(
    void** cal,
    int32_t field,
    int32_t* status);
C, "icuin.dll");
// $ffi->ucal_get(cal, field, status);
// cal : void**
// field : UCalendarDateFields
// 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);
    int ucal_get(
        Pointer cal,   // void**
        int field,   // UCalendarDateFields
        IntByReference status   // UErrorCode* in/out
    );
}

@[Link("icuin")]
lib Libicuin
  fun ucal_get = ucal_get(
    cal : Void**,   # void**
    field : Int32,   # UCalendarDateFields
    status : 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_getNative = Int32 Function(Pointer<Void>, Int32, Pointer<Int32>);
typedef ucal_getDart = int Function(Pointer<Void>, int, Pointer<Int32>);
final ucal_get = DynamicLibrary.open('icuin.dll')
    .lookupFunction<ucal_getNative, ucal_getDart>('ucal_get');
// cal : void** -> Pointer<Void>
// field : UCalendarDateFields -> Int32
// status : UErrorCode* in/out -> Pointer<Int32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function ucal_get(
  cal: Pointer;   // void**
  field: Integer;   // UCalendarDateFields
  status: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icuin.dll' name 'ucal_get';

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

foreign import ccall safe "ucal_get"
  c_ucal_get :: Ptr () -> Int32 -> Ptr Int32 -> IO Int32
-- cal : void** -> Ptr ()
-- field : UCalendarDateFields -> Int32
-- 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 ucal_get =
  foreign "ucal_get"
    ((ptr void) @-> int32_t @-> (ptr int32_t) @-> returning int32_t)
(* cal : void** -> (ptr void) *)
(* field : UCalendarDateFields -> int32_t *)
(* 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 ("ucal_get" ucal-get :convention :cdecl) :int32
  (cal :pointer)   ; void**
  (field :int32)   ; UCalendarDateFields
  (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 $ucal_get = Win32::API::More->new('icuin',
    'int ucal_get(LPVOID cal, int field, LPVOID status)');
# my $ret = $ucal_get->Call($cal, $field, $status);
# cal : void** -> LPVOID
# field : UCalendarDateFields -> int
# 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。