ucnv_getFromUCallBack

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

void ucnv_getFromUCallBack(
    const UConverter* converter,
    UConverterFromUCallback* action,
    const void** context
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Sub ucnv_getFromUCallBack(
    ByRef converter As IntPtr,   ' UConverter*
    action As IntPtr,   ' UConverterFromUCallback* in/out
    context As IntPtr   ' void**
)
End Sub

' converter : UConverter*
' action : UConverterFromUCallback* in/out
' context : void**
Declare PtrSafe Sub ucnv_getFromUCallBack Lib "icuuc" ( _
    ByRef converter As LongPtr, _
    ByVal action As LongPtr, _
    ByVal context As LongPtr)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

ucnv_getFromUCallBack = ctypes.cdll.icuuc.ucnv_getFromUCallBack
ucnv_getFromUCallBack.restype = None
ucnv_getFromUCallBack.argtypes = [
    ctypes.c_void_p,  # converter : UConverter*
    ctypes.c_void_p,  # action : UConverterFromUCallback* in/out
    ctypes.c_void_p,  # context : void**
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnv_getFromUCallBack = Fiddle::Function.new(
  lib['ucnv_getFromUCallBack'],
  [
    Fiddle::TYPE_VOIDP,  # converter : UConverter*
    Fiddle::TYPE_VOIDP,  # action : UConverterFromUCallback* in/out
    Fiddle::TYPE_VOIDP,  # context : void**
  ],
  Fiddle::TYPE_VOID, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnv_getFromUCallBack(
        converter: *const isize,  // UConverter*
        action: *mut *const core::ffi::c_void,  // UConverterFromUCallback* in/out
        context: *const *const ()  // void**
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void ucnv_getFromUCallBack(ref IntPtr converter, IntPtr action, IntPtr context);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnv_getFromUCallBack' -Namespace Win32 -PassThru
# $api::ucnv_getFromUCallBack(converter, action, context)

#uselib "icuuc.dll"
#func global ucnv_getFromUCallBack "ucnv_getFromUCallBack" sptr, sptr, sptr
; ucnv_getFromUCallBack varptr(converter), action, context
; converter : UConverter* -> "sptr"
; action : UConverterFromUCallback* in/out -> "sptr"
; context : void** -> "sptr"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnv_getFromUCallBack = icuuc.NewProc("ucnv_getFromUCallBack")
)

// converter (UConverter*), action (UConverterFromUCallback* in/out), context (void**)
r1, _, err := procucnv_getFromUCallBack.Call(
	uintptr(converter),
	uintptr(action),
	uintptr(context),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure ucnv_getFromUCallBack(
  converter: Pointer;   // UConverter*
  action: Pointer;   // UConverterFromUCallback* in/out
  context: Pointer   // void**
); cdecl;
  external 'icuuc.dll' name 'ucnv_getFromUCallBack';

result := DllCall("icuuc\ucnv_getFromUCallBack"
    , "Ptr", converter   ; UConverter*
    , "Ptr", action   ; UConverterFromUCallback* in/out
    , "Ptr", context   ; void**
    , "Cdecl Int")   ; return: void

●ucnv_getFromUCallBack(converter, action, context) = DLL("icuuc.dll", "int ucnv_getFromUCallBack(void*, void*, void*)")
# 呼び出し: ucnv_getFromUCallBack(converter, action, context)
# converter : UConverter* -> "void*"
# action : UConverterFromUCallback* in/out -> "void*"
# context : void** -> "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 "icuuc" fn ucnv_getFromUCallBack(
    converter: [*c]isize, // UConverter*
    action: ?*anyopaque, // UConverterFromUCallback* in/out
    context: ?*anyopaque // void**
) callconv(.c) void;

proc ucnv_getFromUCallBack(
    `converter`: ptr int,  # UConverter*
    action: pointer,  # UConverterFromUCallback* in/out
    context: pointer  # void**
) {.importc: "ucnv_getFromUCallBack", cdecl, dynlib: "icuuc.dll".}

pragma(lib, "icuuc");
extern(C)
void ucnv_getFromUCallBack(
    ptrdiff_t* converter,   // UConverter*
    void* action,   // UConverterFromUCallback* in/out
    void** context   // void**
);

ccall((:ucnv_getFromUCallBack, "icuuc.dll"), Cvoid,
      (Ptr{Int}, Ptr{Cvoid}, Ptr{Cvoid}),
      converter, action, context)
# converter : UConverter* -> Ptr{Int}
# action : UConverterFromUCallback* in/out -> Ptr{Cvoid}
# context : void** -> Ptr{Cvoid}

local ffi = require("ffi")
ffi.cdef[[
void ucnv_getFromUCallBack(
    intptr_t* converter,
    void* action,
    void** context);
]]
local icuuc = ffi.load("icuuc")
-- icuuc.ucnv_getFromUCallBack(converter, action, context)
-- converter : UConverter*
-- action : UConverterFromUCallback* in/out
-- context : void**
-- 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('icuuc.dll');
const ucnv_getFromUCallBack = lib.func('__cdecl', 'ucnv_getFromUCallBack', 'void', ['intptr_t *', 'void *', 'void *']);
// ucnv_getFromUCallBack(converter, action, context)
// converter : UConverter* -> 'intptr_t *'
// action : UConverterFromUCallback* in/out -> 'void *'
// context : void** -> 'void *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。
// コールバック(関数ポインタ)は koffi.proto/koffi.register で型を定義して渡す(素の void* では JS 関数を渡せない)。

const lib = Deno.dlopen("icuuc.dll", {
  ucnv_getFromUCallBack: { parameters: ["pointer", "pointer", "pointer"], result: "void" },
});
// lib.symbols.ucnv_getFromUCallBack(converter, action, context)
// converter : UConverter* -> "pointer"
// action : UConverterFromUCallback* in/out -> "pointer"
// context : void** -> "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
void ucnv_getFromUCallBack(
    intptr_t* converter,
    void* action,
    void** context);
C, "icuuc.dll");
// $ffi->ucnv_getFromUCallBack(converter, action, context);
// converter : UConverter*
// action : UConverterFromUCallback* in/out
// context : void**
// 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 Icuuc extends Library {
    Icuuc INSTANCE = Native.load("icuuc", Icuuc.class);
    void ucnv_getFromUCallBack(
        LongByReference converter,   // UConverter*
        Callback action,   // UConverterFromUCallback* in/out
        Pointer context   // void**
    );
}

@[Link("icuuc")]
lib Libicuuc
  fun ucnv_getFromUCallBack = ucnv_getFromUCallBack(
    converter : LibC::SSizeT*,   # UConverter*
    action : Void*,   # UConverterFromUCallback* in/out
    context : Void**   # void**
  ) : Void
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 ucnv_getFromUCallBackNative = Void Function(Pointer<IntPtr>, Pointer<Void>, Pointer<Void>);
typedef ucnv_getFromUCallBackDart = void Function(Pointer<IntPtr>, Pointer<Void>, Pointer<Void>);
final ucnv_getFromUCallBack = DynamicLibrary.open('icuuc.dll')
    .lookupFunction<ucnv_getFromUCallBackNative, ucnv_getFromUCallBackDart>('ucnv_getFromUCallBack');
// converter : UConverter* -> Pointer<IntPtr>
// action : UConverterFromUCallback* in/out -> Pointer<Void>
// context : void** -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
procedure ucnv_getFromUCallBack(
  converter: Pointer;   // UConverter*
  action: Pointer;   // UConverterFromUCallback* in/out
  context: Pointer   // void**
); cdecl;
  external 'icuuc.dll' name 'ucnv_getFromUCallBack';

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

foreign import ccall safe "ucnv_getFromUCallBack"
  c_ucnv_getFromUCallBack :: Ptr CIntPtr -> Ptr () -> Ptr () -> IO ()
-- converter : UConverter* -> Ptr CIntPtr
-- action : UConverterFromUCallback* in/out -> Ptr ()
-- context : void** -> Ptr ()
-- 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 ucnv_getfromucallback =
  foreign "ucnv_getFromUCallBack"
    ((ptr intptr_t) @-> (ptr void) @-> (ptr void) @-> returning void)
(* converter : UConverter* -> (ptr intptr_t) *)
(* action : UConverterFromUCallback* in/out -> (ptr void) *)
(* context : void** -> (ptr void) *)
(* 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 icuuc (t "icuuc.dll"))
(cffi:use-foreign-library icuuc)

(cffi:defcfun ("ucnv_getFromUCallBack" ucnv-get-from-ucall-back :convention :cdecl) :void
  (converter :pointer)   ; UConverter*
  (action :pointer)   ; UConverterFromUCallback* in/out
  (context :pointer))   ; void**
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $ucnv_getFromUCallBack = Win32::API::More->new('icuuc',
    'void ucnv_getFromUCallBack(LPVOID converter, LPVOID action, LPVOID context)');
# my $ret = $ucnv_getFromUCallBack->Call($converter, $action, $context);
# converter : UConverter* -> LPVOID
# action : UConverterFromUCallback* in/out -> LPVOID
# context : void** -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。
# コールバック(関数ポインタ)は Perl sub を直接渡せません。Win32::API::Callback を使用してください。