RtlIpv4AddressToStringExW

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

INT RtlIpv4AddressToStringExW(
    const IN_ADDR* Address,
    WORD Port,
    LPWSTR AddressString,
    DWORD* AddressStringLength
);

<DllImport("ntdll.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function RtlIpv4AddressToStringExW(
    Address As IntPtr,   ' IN_ADDR*
    Port As UShort,   ' WORD
    <MarshalAs(UnmanagedType.LPWStr)> AddressString As System.Text.StringBuilder,   ' LPWSTR out
    ByRef AddressStringLength As UInteger   ' DWORD* in/out
) As Integer
End Function

' Address : IN_ADDR*
' Port : WORD
' AddressString : LPWSTR out
' AddressStringLength : DWORD* in/out
Declare PtrSafe Function RtlIpv4AddressToStringExW Lib "ntdll" ( _
    ByVal Address As LongPtr, _
    ByVal Port As Integer, _
    ByVal AddressString As LongPtr, _
    ByRef AddressStringLength 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

RtlIpv4AddressToStringExW = ctypes.windll.ntdll.RtlIpv4AddressToStringExW
RtlIpv4AddressToStringExW.restype = ctypes.c_int
RtlIpv4AddressToStringExW.argtypes = [
    ctypes.c_void_p,  # Address : IN_ADDR*
    ctypes.c_ushort,  # Port : WORD
    wintypes.LPWSTR,  # AddressString : LPWSTR out
    ctypes.POINTER(wintypes.DWORD),  # AddressStringLength : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ntdll.dll')
RtlIpv4AddressToStringExW = Fiddle::Function.new(
  lib['RtlIpv4AddressToStringExW'],
  [
    Fiddle::TYPE_VOIDP,  # Address : IN_ADDR*
    -Fiddle::TYPE_SHORT,  # Port : WORD
    Fiddle::TYPE_VOIDP,  # AddressString : LPWSTR out
    Fiddle::TYPE_VOIDP,  # AddressStringLength : DWORD* in/out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "ntdll")]
extern "system" {
    fn RtlIpv4AddressToStringExW(
        Address: *const IN_ADDR,  // IN_ADDR*
        Port: u16,  // WORD
        AddressString: *mut u16,  // LPWSTR out
        AddressStringLength: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ntdll.dll", CharSet = CharSet.Unicode)]
public static extern int RtlIpv4AddressToStringExW(IntPtr Address, ushort Port, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder AddressString, ref uint AddressStringLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ntdll_RtlIpv4AddressToStringExW' -Namespace Win32 -PassThru
# $api::RtlIpv4AddressToStringExW(Address, Port, AddressString, AddressStringLength)

#uselib "ntdll.dll"
#func global RtlIpv4AddressToStringExW "RtlIpv4AddressToStringExW" wptr, wptr, wptr, wptr
; RtlIpv4AddressToStringExW varptr(Address), Port, varptr(AddressString), varptr(AddressStringLength)   ; 戻り値は stat
; Address : IN_ADDR* -> "wptr"
; Port : WORD -> "wptr"
; AddressString : LPWSTR out -> "wptr"
; AddressStringLength : 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 "ntdll.dll"
#cfunc global RtlIpv4AddressToStringExW "RtlIpv4AddressToStringExW" var, int, var, var
; res = RtlIpv4AddressToStringExW(Address, Port, AddressString, AddressStringLength)
; Address : IN_ADDR* -> "var"
; Port : WORD -> "int"
; AddressString : LPWSTR out -> "var"
; AddressStringLength : 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。

; INT RtlIpv4AddressToStringExW(IN_ADDR* Address, WORD Port, LPWSTR AddressString, DWORD* AddressStringLength)
#uselib "ntdll.dll"
#cfunc global RtlIpv4AddressToStringExW "RtlIpv4AddressToStringExW" var, int, var, var
; res = RtlIpv4AddressToStringExW(Address, Port, AddressString, AddressStringLength)
; Address : IN_ADDR* -> "var"
; Port : WORD -> "int"
; AddressString : LPWSTR out -> "var"
; AddressStringLength : 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 (
	ntdll = windows.NewLazySystemDLL("ntdll.dll")
	procRtlIpv4AddressToStringExW = ntdll.NewProc("RtlIpv4AddressToStringExW")
)

// Address (IN_ADDR*), Port (WORD), AddressString (LPWSTR out), AddressStringLength (DWORD* in/out)
r1, _, err := procRtlIpv4AddressToStringExW.Call(
	uintptr(Address),
	uintptr(Port),
	uintptr(AddressString),
	uintptr(AddressStringLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function RtlIpv4AddressToStringExW(
  Address: Pointer;   // IN_ADDR*
  Port: Word;   // WORD
  AddressString: PWideChar;   // LPWSTR out
  AddressStringLength: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'ntdll.dll' name 'RtlIpv4AddressToStringExW';

result := DllCall("ntdll\RtlIpv4AddressToStringExW"
    , "Ptr", Address   ; IN_ADDR*
    , "UShort", Port   ; WORD
    , "Ptr", AddressString   ; LPWSTR out
    , "Ptr", AddressStringLength   ; DWORD* in/out
    , "Int")   ; return: INT

●RtlIpv4AddressToStringExW(Address, Port, AddressString, AddressStringLength) = DLL("ntdll.dll", "int RtlIpv4AddressToStringExW(void*, int, char*, void*)")
# 呼び出し: RtlIpv4AddressToStringExW(Address, Port, AddressString, AddressStringLength)
# Address : IN_ADDR* -> "void*"
# Port : WORD -> "int"
# AddressString : LPWSTR out -> "char*"
# AddressStringLength : 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。