LoadIconA

// USER32.dll  (ANSI / -A)
#include <windows.h>

HICON LoadIconA(
    HINSTANCE hInstance,   // optional
    LPCSTR lpIconName
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function LoadIconA(
    hInstance As IntPtr,   ' HINSTANCE optional
    <MarshalAs(UnmanagedType.LPStr)> lpIconName As String   ' LPCSTR
) As IntPtr
End Function

' hInstance : HINSTANCE optional
' lpIconName : LPCSTR
Declare PtrSafe Function LoadIconA Lib "user32" ( _
    ByVal hInstance As LongPtr, _
    ByVal lpIconName As String) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

LoadIconA = ctypes.windll.user32.LoadIconA
LoadIconA.restype = ctypes.c_void_p
LoadIconA.argtypes = [
    wintypes.HANDLE,  # hInstance : HINSTANCE optional
    wintypes.LPCSTR,  # lpIconName : LPCSTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
LoadIconA = Fiddle::Function.new(
  lib['LoadIconA'],
  [
    Fiddle::TYPE_VOIDP,  # hInstance : HINSTANCE optional
    Fiddle::TYPE_VOIDP,  # lpIconName : LPCSTR
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn LoadIconA(
        hInstance: *mut core::ffi::c_void,  // HINSTANCE optional
        lpIconName: *const u8  // LPCSTR
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern IntPtr LoadIconA(IntPtr hInstance, [MarshalAs(UnmanagedType.LPStr)] string lpIconName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_LoadIconA' -Namespace Win32 -PassThru
# $api::LoadIconA(hInstance, lpIconName)

#uselib "USER32.dll"
#func global LoadIconA "LoadIconA" sptr, sptr
; LoadIconA hInstance, lpIconName   ; 戻り値は stat
; hInstance : HINSTANCE optional -> "sptr"
; lpIconName : LPCSTR -> "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。

#uselib "USER32.dll"
#cfunc global LoadIconA "LoadIconA" sptr, str
; res = LoadIconA(hInstance, lpIconName)
; hInstance : HINSTANCE optional -> "sptr"
; lpIconName : LPCSTR -> "str"

; HICON LoadIconA(HINSTANCE hInstance, LPCSTR lpIconName)
#uselib "USER32.dll"
#cfunc global LoadIconA "LoadIconA" intptr, str
; res = LoadIconA(hInstance, lpIconName)
; hInstance : HINSTANCE optional -> "intptr"
; lpIconName : LPCSTR -> "str"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procLoadIconA = user32.NewProc("LoadIconA")
)

// hInstance (HINSTANCE optional), lpIconName (LPCSTR)
r1, _, err := procLoadIconA.Call(
	uintptr(hInstance),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpIconName))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HICON

function LoadIconA(
  hInstance: THandle;   // HINSTANCE optional
  lpIconName: PAnsiChar   // LPCSTR
): THandle; stdcall;
  external 'USER32.dll' name 'LoadIconA';

result := DllCall("USER32\LoadIconA"
    , "Ptr", hInstance   ; HINSTANCE optional
    , "AStr", lpIconName   ; LPCSTR
    , "Ptr")   ; return: HICON

●LoadIconA(hInstance, lpIconName) = DLL("USER32.dll", "void* LoadIconA(void*, char*)")
# 呼び出し: LoadIconA(hInstance, lpIconName)
# hInstance : HINSTANCE optional -> "void*"
# lpIconName : LPCSTR -> "char*"
# 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)。

const std = @import("std");

extern "user32" fn LoadIconA(
    hInstance: ?*anyopaque, // HINSTANCE optional
    lpIconName: [*c]const u8 // LPCSTR
) callconv(std.os.windows.WINAPI) ?*anyopaque;

proc LoadIconA(
    hInstance: pointer,  # HINSTANCE optional
    lpIconName: cstring  # LPCSTR
): pointer {.importc: "LoadIconA", stdcall, dynlib: "USER32.dll".}

pragma(lib, "user32");
extern(Windows)
void* LoadIconA(
    void* hInstance,   // HINSTANCE optional
    const(char)* lpIconName   // LPCSTR
);

ccall((:LoadIconA, "USER32.dll"), stdcall, Ptr{Cvoid},
      (Ptr{Cvoid}, Cstring),
      hInstance, lpIconName)
# hInstance : HINSTANCE optional -> Ptr{Cvoid}
# lpIconName : LPCSTR -> Cstring
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
void* LoadIconA(
    void* hInstance,
    const char* lpIconName);
]]
local user32 = ffi.load("user32")
-- user32.LoadIconA(hInstance, lpIconName)
-- hInstance : HINSTANCE optional
-- lpIconName : LPCSTR
-- 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('USER32.dll');
const LoadIconA = lib.func('__stdcall', 'LoadIconA', 'void *', ['void *', 'str']);
// LoadIconA(hInstance, lpIconName)
// hInstance : HINSTANCE optional -> 'void *'
// lpIconName : LPCSTR -> 'str'
// 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("USER32.dll", {
  LoadIconA: { parameters: ["pointer", "buffer"], result: "pointer" },
});
// lib.symbols.LoadIconA(hInstance, lpIconName)
// hInstance : HINSTANCE optional -> "pointer"
// lpIconName : LPCSTR -> "buffer"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
void* LoadIconA(
    void* hInstance,
    const char* lpIconName);
C, "USER32.dll");
// $ffi->LoadIconA(hInstance, lpIconName);
// hInstance : HINSTANCE optional
// lpIconName : LPCSTR
// 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 User32 extends StdCallLibrary {
    User32 INSTANCE = Native.load("user32", User32.class, W32APIOptions.ASCII_OPTIONS);
    Pointer LoadIconA(
        Pointer hInstance,   // HINSTANCE optional
        String lpIconName   // LPCSTR
    );
}

@[Link("user32")]
lib LibUSER32
  fun LoadIconA = LoadIconA(
    hInstance : Void*,   # HINSTANCE optional
    lpIconName : UInt8*   # LPCSTR
  ) : Void*
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 LoadIconANative = Pointer<Void> Function(Pointer<Void>, Pointer<Utf8>);
typedef LoadIconADart = Pointer<Void> Function(Pointer<Void>, Pointer<Utf8>);
final LoadIconA = DynamicLibrary.open('USER32.dll')
    .lookupFunction<LoadIconANative, LoadIconADart>('LoadIconA');
// hInstance : HINSTANCE optional -> Pointer<Void>
// lpIconName : LPCSTR -> Pointer<Utf8>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function LoadIconA(
  hInstance: THandle;   // HINSTANCE optional
  lpIconName: PAnsiChar   // LPCSTR
): THandle; stdcall;
  external 'USER32.dll' name 'LoadIconA';

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

foreign import stdcall safe "LoadIconA"
  c_LoadIconA :: Ptr () -> CString -> IO (Ptr ())
-- hInstance : HINSTANCE optional -> Ptr ()
-- lpIconName : LPCSTR -> CString
-- 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 loadicona =
  foreign "LoadIconA"
    ((ptr void) @-> string @-> returning (ptr void))
(* hInstance : HINSTANCE optional -> (ptr void) *)
(* lpIconName : LPCSTR -> string *)
(* 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 user32 (t "USER32.dll"))
(cffi:use-foreign-library user32)

(cffi:defcfun ("LoadIconA" load-icon-a :convention :stdcall) :pointer
  (h-instance :pointer)   ; HINSTANCE optional
  (lp-icon-name :string))   ; LPCSTR
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $LoadIconA = Win32::API::More->new('USER32',
    'HANDLE LoadIconA(HANDLE hInstance, LPCSTR lpIconName)');
# my $ret = $LoadIconA->Call($hInstance, $lpIconName);
# hInstance : HINSTANCE optional -> HANDLE
# lpIconName : LPCSTR -> LPCSTR
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。