ExtractIconExW

// SHELL32.dll  (Unicode / -W)
#include <windows.h>

DWORD ExtractIconExW(
    LPCWSTR lpszFile,
    INT nIconIndex,
    HICON* phiconLarge,   // optional
    HICON* phiconSmall,   // optional
    DWORD nIcons
);

<DllImport("SHELL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function ExtractIconExW(
    <MarshalAs(UnmanagedType.LPWStr)> lpszFile As String,   ' LPCWSTR
    nIconIndex As Integer,   ' INT
    phiconLarge As IntPtr,   ' HICON* optional, out
    phiconSmall As IntPtr,   ' HICON* optional, out
    nIcons As UInteger   ' DWORD
) As UInteger
End Function

' lpszFile : LPCWSTR
' nIconIndex : INT
' phiconLarge : HICON* optional, out
' phiconSmall : HICON* optional, out
' nIcons : DWORD
Declare PtrSafe Function ExtractIconExW Lib "shell32" ( _
    ByVal lpszFile As LongPtr, _
    ByVal nIconIndex As Long, _
    ByVal phiconLarge As LongPtr, _
    ByVal phiconSmall As LongPtr, _
    ByVal nIcons As Long) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

ExtractIconExW = ctypes.windll.shell32.ExtractIconExW
ExtractIconExW.restype = wintypes.DWORD
ExtractIconExW.argtypes = [
    wintypes.LPCWSTR,  # lpszFile : LPCWSTR
    ctypes.c_int,  # nIconIndex : INT
    ctypes.c_void_p,  # phiconLarge : HICON* optional, out
    ctypes.c_void_p,  # phiconSmall : HICON* optional, out
    wintypes.DWORD,  # nIcons : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHELL32.dll')
ExtractIconExW = Fiddle::Function.new(
  lib['ExtractIconExW'],
  [
    Fiddle::TYPE_VOIDP,  # lpszFile : LPCWSTR
    Fiddle::TYPE_INT,  # nIconIndex : INT
    Fiddle::TYPE_VOIDP,  # phiconLarge : HICON* optional, out
    Fiddle::TYPE_VOIDP,  # phiconSmall : HICON* optional, out
    -Fiddle::TYPE_INT,  # nIcons : DWORD
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shell32")]
extern "system" {
    fn ExtractIconExW(
        lpszFile: *const u16,  // LPCWSTR
        nIconIndex: i32,  // INT
        phiconLarge: *mut *mut core::ffi::c_void,  // HICON* optional, out
        phiconSmall: *mut *mut core::ffi::c_void,  // HICON* optional, out
        nIcons: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHELL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern uint ExtractIconExW([MarshalAs(UnmanagedType.LPWStr)] string lpszFile, int nIconIndex, IntPtr phiconLarge, IntPtr phiconSmall, uint nIcons);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHELL32_ExtractIconExW' -Namespace Win32 -PassThru
# $api::ExtractIconExW(lpszFile, nIconIndex, phiconLarge, phiconSmall, nIcons)

#uselib "SHELL32.dll"
#func global ExtractIconExW "ExtractIconExW" wptr, wptr, wptr, wptr, wptr
; ExtractIconExW lpszFile, nIconIndex, phiconLarge, phiconSmall, nIcons   ; 戻り値は stat
; lpszFile : LPCWSTR -> "wptr"
; nIconIndex : INT -> "wptr"
; phiconLarge : HICON* optional, out -> "wptr"
; phiconSmall : HICON* optional, out -> "wptr"
; nIcons : DWORD -> "wptr"
; ※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。

#uselib "SHELL32.dll"
#cfunc global ExtractIconExW "ExtractIconExW" wstr, int, sptr, sptr, int
; res = ExtractIconExW(lpszFile, nIconIndex, phiconLarge, phiconSmall, nIcons)
; lpszFile : LPCWSTR -> "wstr"
; nIconIndex : INT -> "int"
; phiconLarge : HICON* optional, out -> "sptr"
; phiconSmall : HICON* optional, out -> "sptr"
; nIcons : DWORD -> "int"

; DWORD ExtractIconExW(LPCWSTR lpszFile, INT nIconIndex, HICON* phiconLarge, HICON* phiconSmall, DWORD nIcons)
#uselib "SHELL32.dll"
#cfunc global ExtractIconExW "ExtractIconExW" wstr, int, intptr, intptr, int
; res = ExtractIconExW(lpszFile, nIconIndex, phiconLarge, phiconSmall, nIcons)
; lpszFile : LPCWSTR -> "wstr"
; nIconIndex : INT -> "int"
; phiconLarge : HICON* optional, out -> "intptr"
; phiconSmall : HICON* optional, out -> "intptr"
; nIcons : DWORD -> "int"

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

var (
	shell32 = windows.NewLazySystemDLL("SHELL32.dll")
	procExtractIconExW = shell32.NewProc("ExtractIconExW")
)

// lpszFile (LPCWSTR), nIconIndex (INT), phiconLarge (HICON* optional, out), phiconSmall (HICON* optional, out), nIcons (DWORD)
r1, _, err := procExtractIconExW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszFile))),
	uintptr(nIconIndex),
	uintptr(phiconLarge),
	uintptr(phiconSmall),
	uintptr(nIcons),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function ExtractIconExW(
  lpszFile: PWideChar;   // LPCWSTR
  nIconIndex: Integer;   // INT
  phiconLarge: Pointer;   // HICON* optional, out
  phiconSmall: Pointer;   // HICON* optional, out
  nIcons: DWORD   // DWORD
): DWORD; stdcall;
  external 'SHELL32.dll' name 'ExtractIconExW';

result := DllCall("SHELL32\ExtractIconExW"
    , "WStr", lpszFile   ; LPCWSTR
    , "Int", nIconIndex   ; INT
    , "Ptr", phiconLarge   ; HICON* optional, out
    , "Ptr", phiconSmall   ; HICON* optional, out
    , "UInt", nIcons   ; DWORD
    , "UInt")   ; return: DWORD

●ExtractIconExW(lpszFile, nIconIndex, phiconLarge, phiconSmall, nIcons) = DLL("SHELL32.dll", "dword ExtractIconExW(char*, int, void*, void*, dword)")
# 呼び出し: ExtractIconExW(lpszFile, nIconIndex, phiconLarge, phiconSmall, nIcons)
# lpszFile : LPCWSTR -> "char*"
# nIconIndex : INT -> "int"
# phiconLarge : HICON* optional, out -> "void*"
# phiconSmall : HICON* optional, out -> "void*"
# nIcons : DWORD -> "dword"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。

const std = @import("std");

extern "shell32" fn ExtractIconExW(
    lpszFile: [*c]const u16, // LPCWSTR
    nIconIndex: i32, // INT
    phiconLarge: ?*anyopaque, // HICON* optional, out
    phiconSmall: ?*anyopaque, // HICON* optional, out
    nIcons: u32 // DWORD
) callconv(std.os.windows.WINAPI) u32;
// Unicode(-W): UTF-16LE のヌル終端バッファ([*c]const u16)を渡す。

proc ExtractIconExW(
    lpszFile: WideCString,  # LPCWSTR
    nIconIndex: int32,  # INT
    phiconLarge: pointer,  # HICON* optional, out
    phiconSmall: pointer,  # HICON* optional, out
    nIcons: uint32  # DWORD
): uint32 {.importc: "ExtractIconExW", stdcall, dynlib: "SHELL32.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "shell32");
extern(Windows)
uint ExtractIconExW(
    const(wchar)* lpszFile,   // LPCWSTR
    int nIconIndex,   // INT
    void* phiconLarge,   // HICON* optional, out
    void* phiconSmall,   // HICON* optional, out
    uint nIcons   // DWORD
);

ccall((:ExtractIconExW, "SHELL32.dll"), stdcall, UInt32,
      (Cwstring, Int32, Ptr{Cvoid}, Ptr{Cvoid}, UInt32),
      lpszFile, nIconIndex, phiconLarge, phiconSmall, nIcons)
# lpszFile : LPCWSTR -> Cwstring
# nIconIndex : INT -> Int32
# phiconLarge : HICON* optional, out -> Ptr{Cvoid}
# phiconSmall : HICON* optional, out -> Ptr{Cvoid}
# nIcons : DWORD -> UInt32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。
# Unicode(-W): Cwstring には transcode(UInt16, "...") 等で UTF-16 を渡す。

local ffi = require("ffi")
ffi.cdef[[
uint32_t ExtractIconExW(
    const uint16_t* lpszFile,
    int32_t nIconIndex,
    void* phiconLarge,
    void* phiconSmall,
    uint32_t nIcons);
]]
local shell32 = ffi.load("shell32")
-- shell32.ExtractIconExW(lpszFile, nIconIndex, phiconLarge, phiconSmall, nIcons)
-- lpszFile : LPCWSTR
-- nIconIndex : INT
-- phiconLarge : HICON* optional, out
-- phiconSmall : HICON* optional, out
-- nIcons : DWORD
-- 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。
-- Unicode(-W): uint16_t* には UTF-16LE のバッファ(ffi.new("uint16_t[?]", ...))を渡す。

const koffi = require('koffi');
const lib = koffi.load('SHELL32.dll');
const ExtractIconExW = lib.func('__stdcall', 'ExtractIconExW', 'uint32_t', ['str16', 'int32_t', 'void *', 'void *', 'uint32_t']);
// ExtractIconExW(lpszFile, nIconIndex, phiconLarge, phiconSmall, nIcons)
// lpszFile : LPCWSTR -> 'str16'
// nIconIndex : INT -> 'int32_t'
// phiconLarge : HICON* optional, out -> 'void *'
// phiconSmall : HICON* optional, out -> 'void *'
// nIcons : DWORD -> 'uint32_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("SHELL32.dll", {
  ExtractIconExW: { parameters: ["buffer", "i32", "pointer", "pointer", "u32"], result: "u32" },
});
// lib.symbols.ExtractIconExW(lpszFile, nIconIndex, phiconLarge, phiconSmall, nIcons)
// lpszFile : LPCWSTR -> "buffer"
// nIconIndex : INT -> "i32"
// phiconLarge : HICON* optional, out -> "pointer"
// phiconSmall : HICON* optional, out -> "pointer"
// nIcons : DWORD -> "u32"
// 文字列は "buffer"。Unicode(-W) は new TextEncoder() ではなく UTF-16LE のバイト列(末尾に \x00\x00)を Uint8Array で渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
uint32_t ExtractIconExW(
    const uint16_t* lpszFile,
    int32_t nIconIndex,
    void* phiconLarge,
    void* phiconSmall,
    uint32_t nIcons);
C, "SHELL32.dll");
// $ffi->ExtractIconExW(lpszFile, nIconIndex, phiconLarge, phiconSmall, nIcons);
// lpszFile : LPCWSTR
// nIconIndex : INT
// phiconLarge : HICON* optional, out
// phiconSmall : HICON* optional, out
// nIcons : DWORD
// 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。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

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

public interface Shell32 extends StdCallLibrary {
    Shell32 INSTANCE = Native.load("shell32", Shell32.class, W32APIOptions.UNICODE_OPTIONS);
    int ExtractIconExW(
        WString lpszFile,   // LPCWSTR
        int nIconIndex,   // INT
        Pointer phiconLarge,   // HICON* optional, out
        Pointer phiconSmall,   // HICON* optional, out
        int nIcons   // DWORD
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("shell32")]
lib LibSHELL32
  fun ExtractIconExW = ExtractIconExW(
    lpszFile : UInt16*,   # LPCWSTR
    nIconIndex : Int32,   # INT
    phiconLarge : Void*,   # HICON* optional, out
    phiconSmall : Void*,   # HICON* optional, out
    nIcons : UInt32   # DWORD
  ) : UInt32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

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

typedef ExtractIconExWNative = Uint32 Function(Pointer<Utf16>, Int32, Pointer<Void>, Pointer<Void>, Uint32);
typedef ExtractIconExWDart = int Function(Pointer<Utf16>, int, Pointer<Void>, Pointer<Void>, int);
final ExtractIconExW = DynamicLibrary.open('SHELL32.dll')
    .lookupFunction<ExtractIconExWNative, ExtractIconExWDart>('ExtractIconExW');
// lpszFile : LPCWSTR -> Pointer<Utf16>
// nIconIndex : INT -> Int32
// phiconLarge : HICON* optional, out -> Pointer<Void>
// phiconSmall : HICON* optional, out -> Pointer<Void>
// nIcons : DWORD -> Uint32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function ExtractIconExW(
  lpszFile: PWideChar;   // LPCWSTR
  nIconIndex: Integer;   // INT
  phiconLarge: Pointer;   // HICON* optional, out
  phiconSmall: Pointer;   // HICON* optional, out
  nIcons: DWORD   // DWORD
): DWORD; stdcall;
  external 'SHELL32.dll' name 'ExtractIconExW';

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

foreign import stdcall safe "ExtractIconExW"
  c_ExtractIconExW :: CWString -> Int32 -> Ptr () -> Ptr () -> Word32 -> IO Word32
-- lpszFile : LPCWSTR -> CWString
-- nIconIndex : INT -> Int32
-- phiconLarge : HICON* optional, out -> Ptr ()
-- phiconSmall : HICON* optional, out -> Ptr ()
-- nIcons : DWORD -> Word32
-- 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 extracticonexw =
  foreign "ExtractIconExW"
    ((ptr uint16_t) @-> int32_t @-> (ptr void) @-> (ptr void) @-> uint32_t @-> returning uint32_t)
(* lpszFile : LPCWSTR -> (ptr uint16_t) *)
(* nIconIndex : INT -> int32_t *)
(* phiconLarge : HICON* optional, out -> (ptr void) *)
(* phiconSmall : HICON* optional, out -> (ptr void) *)
(* nIcons : DWORD -> uint32_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 shell32 (t "SHELL32.dll"))
(cffi:use-foreign-library shell32)

(cffi:defcfun ("ExtractIconExW" extract-icon-ex-w :convention :stdcall) :uint32
  (lpsz-file (:string :encoding :utf-16le))   ; LPCWSTR
  (n-icon-index :int32)   ; INT
  (phicon-large :pointer)   ; HICON* optional, out
  (phicon-small :pointer)   ; HICON* optional, out
  (n-icons :uint32))   ; DWORD
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $ExtractIconExW = Win32::API::More->new('SHELL32',
    'DWORD ExtractIconExW(LPCWSTR lpszFile, int nIconIndex, HANDLE phiconLarge, HANDLE phiconSmall, DWORD nIcons)');
# my $ret = $ExtractIconExW->Call($lpszFile, $nIconIndex, $phiconLarge, $phiconSmall, $nIcons);
# lpszFile : LPCWSTR -> LPCWSTR
# nIconIndex : INT -> int
# phiconLarge : HICON* optional, out -> HANDLE
# phiconSmall : HICON* optional, out -> HANDLE
# nIcons : DWORD -> DWORD
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。
# Unicode(-W): LPCWSTR/LPWSTR は Win32::API が UTF-16 変換を行う。