GetComputerNameExA

// KERNEL32.dll  (ANSI / -A)
#include <windows.h>

BOOL GetComputerNameExA(
    COMPUTER_NAME_FORMAT NameType,
    LPSTR lpBuffer,   // optional
    DWORD* nSize
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetComputerNameExA(
    NameType As Integer,   ' COMPUTER_NAME_FORMAT
    <MarshalAs(UnmanagedType.LPStr)> lpBuffer As System.Text.StringBuilder,   ' LPSTR optional, out
    ByRef nSize As UInteger   ' DWORD* in/out
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' NameType : COMPUTER_NAME_FORMAT
' lpBuffer : LPSTR optional, out
' nSize : DWORD* in/out
Declare PtrSafe Function GetComputerNameExA Lib "kernel32" ( _
    ByVal NameType As Long, _
    ByVal lpBuffer As String, _
    ByRef nSize 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

GetComputerNameExA = ctypes.windll.kernel32.GetComputerNameExA
GetComputerNameExA.restype = wintypes.BOOL
GetComputerNameExA.argtypes = [
    ctypes.c_int,  # NameType : COMPUTER_NAME_FORMAT
    wintypes.LPSTR,  # lpBuffer : LPSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # nSize : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetComputerNameExA = Fiddle::Function.new(
  lib['GetComputerNameExA'],
  [
    Fiddle::TYPE_INT,  # NameType : COMPUTER_NAME_FORMAT
    Fiddle::TYPE_VOIDP,  # lpBuffer : LPSTR optional, out
    Fiddle::TYPE_VOIDP,  # nSize : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetComputerNameExA(
        NameType: i32,  // COMPUTER_NAME_FORMAT
        lpBuffer: *mut u8,  // LPSTR optional, out
        nSize: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool GetComputerNameExA(int NameType, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpBuffer, ref uint nSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetComputerNameExA' -Namespace Win32 -PassThru
# $api::GetComputerNameExA(NameType, lpBuffer, nSize)

#uselib "KERNEL32.dll"
#func global GetComputerNameExA "GetComputerNameExA" sptr, sptr, sptr
; GetComputerNameExA NameType, varptr(lpBuffer), varptr(nSize)   ; 戻り値は stat
; NameType : COMPUTER_NAME_FORMAT -> "sptr"
; lpBuffer : LPSTR optional, out -> "sptr"
; nSize : DWORD* 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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetComputerNameExA = kernel32.NewProc("GetComputerNameExA")
)

// NameType (COMPUTER_NAME_FORMAT), lpBuffer (LPSTR optional, out), nSize (DWORD* in/out)
r1, _, err := procGetComputerNameExA.Call(
	uintptr(NameType),
	uintptr(lpBuffer),
	uintptr(nSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetComputerNameExA(
  NameType: Integer;   // COMPUTER_NAME_FORMAT
  lpBuffer: PAnsiChar;   // LPSTR optional, out
  nSize: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetComputerNameExA';

result := DllCall("KERNEL32\GetComputerNameExA"
    , "Int", NameType   ; COMPUTER_NAME_FORMAT
    , "Ptr", lpBuffer   ; LPSTR optional, out
    , "Ptr", nSize   ; DWORD* in/out
    , "Int")   ; return: BOOL

●GetComputerNameExA(NameType, lpBuffer, nSize) = DLL("KERNEL32.dll", "bool GetComputerNameExA(int, char*, void*)")
# 呼び出し: GetComputerNameExA(NameType, lpBuffer, nSize)
# NameType : COMPUTER_NAME_FORMAT -> "int"
# lpBuffer : LPSTR optional, out -> "char*"
# nSize : DWORD* 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)。

const std = @import("std");

extern "kernel32" fn GetComputerNameExA(
    NameType: i32, // COMPUTER_NAME_FORMAT
    lpBuffer: [*c]u8, // LPSTR optional, out
    nSize: [*c]u32 // DWORD* in/out
) callconv(std.os.windows.WINAPI) i32;

proc GetComputerNameExA(
    NameType: int32,  # COMPUTER_NAME_FORMAT
    lpBuffer: ptr char,  # LPSTR optional, out
    nSize: ptr uint32  # DWORD* in/out
): int32 {.importc: "GetComputerNameExA", stdcall, dynlib: "KERNEL32.dll".}

pragma(lib, "kernel32");
extern(Windows)
int GetComputerNameExA(
    int NameType,   // COMPUTER_NAME_FORMAT
    char* lpBuffer,   // LPSTR optional, out
    uint* nSize   // DWORD* in/out
);

ccall((:GetComputerNameExA, "KERNEL32.dll"), stdcall, Int32,
      (Int32, Ptr{UInt8}, Ptr{UInt32}),
      NameType, lpBuffer, nSize)
# NameType : COMPUTER_NAME_FORMAT -> Int32
# lpBuffer : LPSTR optional, out -> Ptr{UInt8}
# nSize : DWORD* in/out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t GetComputerNameExA(
    int32_t NameType,
    char* lpBuffer,
    uint32_t* nSize);
]]
local kernel32 = ffi.load("kernel32")
-- kernel32.GetComputerNameExA(NameType, lpBuffer, nSize)
-- NameType : COMPUTER_NAME_FORMAT
-- lpBuffer : LPSTR optional, out
-- nSize : DWORD* 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('KERNEL32.dll');
const GetComputerNameExA = lib.func('__stdcall', 'GetComputerNameExA', 'int32_t', ['int32_t', 'char *', 'uint32_t *']);
// GetComputerNameExA(NameType, lpBuffer, nSize)
// NameType : COMPUTER_NAME_FORMAT -> 'int32_t'
// lpBuffer : LPSTR optional, out -> 'char *'
// nSize : DWORD* in/out -> '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("KERNEL32.dll", {
  GetComputerNameExA: { parameters: ["i32", "buffer", "pointer"], result: "i32" },
});
// lib.symbols.GetComputerNameExA(NameType, lpBuffer, nSize)
// NameType : COMPUTER_NAME_FORMAT -> "i32"
// lpBuffer : LPSTR optional, out -> "buffer"
// nSize : DWORD* in/out -> "pointer"
// 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
int32_t GetComputerNameExA(
    int32_t NameType,
    char* lpBuffer,
    uint32_t* nSize);
C, "KERNEL32.dll");
// $ffi->GetComputerNameExA(NameType, lpBuffer, nSize);
// NameType : COMPUTER_NAME_FORMAT
// lpBuffer : LPSTR optional, out
// nSize : DWORD* 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。
// 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 Kernel32 extends StdCallLibrary {
    Kernel32 INSTANCE = Native.load("kernel32", Kernel32.class, W32APIOptions.ASCII_OPTIONS);
    boolean GetComputerNameExA(
        int NameType,   // COMPUTER_NAME_FORMAT
        byte[] lpBuffer,   // LPSTR optional, out
        IntByReference nSize   // DWORD* in/out
    );
}

@[Link("kernel32")]
lib LibKERNEL32
  fun GetComputerNameExA = GetComputerNameExA(
    NameType : Int32,   # COMPUTER_NAME_FORMAT
    lpBuffer : UInt8*,   # LPSTR optional, out
    nSize : UInt32*   # DWORD* in/out
  ) : Int32
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 GetComputerNameExANative = Int32 Function(Int32, Pointer<Utf8>, Pointer<Uint32>);
typedef GetComputerNameExADart = int Function(int, Pointer<Utf8>, Pointer<Uint32>);
final GetComputerNameExA = DynamicLibrary.open('KERNEL32.dll')
    .lookupFunction<GetComputerNameExANative, GetComputerNameExADart>('GetComputerNameExA');
// NameType : COMPUTER_NAME_FORMAT -> Int32
// lpBuffer : LPSTR optional, out -> Pointer<Utf8>
// nSize : DWORD* in/out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetComputerNameExA(
  NameType: Integer;   // COMPUTER_NAME_FORMAT
  lpBuffer: PAnsiChar;   // LPSTR optional, out
  nSize: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetComputerNameExA';

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

foreign import stdcall safe "GetComputerNameExA"
  c_GetComputerNameExA :: Int32 -> CString -> Ptr Word32 -> IO CInt
-- NameType : COMPUTER_NAME_FORMAT -> Int32
-- lpBuffer : LPSTR optional, out -> CString
-- nSize : DWORD* in/out -> Ptr 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 getcomputernameexa =
  foreign "GetComputerNameExA"
    (int32_t @-> string @-> (ptr uint32_t) @-> returning int32_t)
(* NameType : COMPUTER_NAME_FORMAT -> int32_t *)
(* lpBuffer : LPSTR optional, out -> string *)
(* nSize : DWORD* in/out -> (ptr 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 kernel32 (t "KERNEL32.dll"))
(cffi:use-foreign-library kernel32)

(cffi:defcfun ("GetComputerNameExA" get-computer-name-ex-a :convention :stdcall) :int32
  (name-type :int32)   ; COMPUTER_NAME_FORMAT
  (lp-buffer :pointer)   ; LPSTR optional, out
  (n-size :pointer))   ; DWORD* in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GetComputerNameExA = Win32::API::More->new('KERNEL32',
    'BOOL GetComputerNameExA(int NameType, LPSTR lpBuffer, LPVOID nSize)');
# my $ret = $GetComputerNameExA->Call($NameType, $lpBuffer, $nSize);
# NameType : COMPUTER_NAME_FORMAT -> int
# lpBuffer : LPSTR optional, out -> LPSTR
# nSize : DWORD* 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。