GetComputerNameW

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

BOOL GetComputerNameW(
    LPWSTR lpBuffer,   // optional
    DWORD* nSize
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetComputerNameW(
    <MarshalAs(UnmanagedType.LPWStr)> lpBuffer As System.Text.StringBuilder,   ' LPWSTR optional, out
    ByRef nSize As UInteger   ' DWORD* in/out
) As Boolean
End Function

' lpBuffer : LPWSTR optional, out
' nSize : DWORD* in/out
Declare PtrSafe Function GetComputerNameW Lib "kernel32" ( _
    ByVal lpBuffer As LongPtr, _
    ByRef nSize 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

GetComputerNameW = ctypes.windll.kernel32.GetComputerNameW
GetComputerNameW.restype = wintypes.BOOL
GetComputerNameW.argtypes = [
    wintypes.LPWSTR,  # lpBuffer : LPWSTR 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')
GetComputerNameW = Fiddle::Function.new(
  lib['GetComputerNameW'],
  [
    Fiddle::TYPE_VOIDP,  # lpBuffer : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # nSize : DWORD* in/out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn GetComputerNameW(
        lpBuffer: *mut u16,  // LPWSTR 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.Unicode, SetLastError = true)]
public static extern bool GetComputerNameW([MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpBuffer, ref uint nSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetComputerNameW' -Namespace Win32 -PassThru
# $api::GetComputerNameW(lpBuffer, nSize)

#uselib "KERNEL32.dll"
#func global GetComputerNameW "GetComputerNameW" wptr, wptr
; GetComputerNameW varptr(lpBuffer), varptr(nSize)   ; 戻り値は stat
; lpBuffer : LPWSTR optional, out -> "wptr"
; nSize : DWORD* in/out -> "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 "KERNEL32.dll"
#cfunc global GetComputerNameW "GetComputerNameW" var, var
; res = GetComputerNameW(lpBuffer, nSize)
; lpBuffer : LPWSTR optional, out -> "var"
; nSize : DWORD* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; BOOL GetComputerNameW(LPWSTR lpBuffer, DWORD* nSize)
#uselib "KERNEL32.dll"
#cfunc global GetComputerNameW "GetComputerNameW" var, var
; res = GetComputerNameW(lpBuffer, nSize)
; lpBuffer : LPWSTR optional, out -> "var"
; nSize : DWORD* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetComputerNameW = kernel32.NewProc("GetComputerNameW")
)

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

function GetComputerNameW(
  lpBuffer: PWideChar;   // LPWSTR optional, out
  nSize: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetComputerNameW';

result := DllCall("KERNEL32\GetComputerNameW"
    , "Ptr", lpBuffer   ; LPWSTR optional, out
    , "Ptr", nSize   ; DWORD* in/out
    , "Int")   ; return: BOOL

●GetComputerNameW(lpBuffer, nSize) = DLL("KERNEL32.dll", "bool GetComputerNameW(char*, void*)")
# 呼び出し: GetComputerNameW(lpBuffer, nSize)
# lpBuffer : LPWSTR 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。