RtlIpv4AddressToStringExA

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

INT RtlIpv4AddressToStringExA(
    const IN_ADDR* Address,
    WORD Port,
    LPSTR AddressString,
    DWORD* AddressStringLength
);

<DllImport("ntdll.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function RtlIpv4AddressToStringExA(
    Address As IntPtr,   ' IN_ADDR*
    Port As UShort,   ' WORD
    <MarshalAs(UnmanagedType.LPStr)> AddressString As System.Text.StringBuilder,   ' LPSTR out
    ByRef AddressStringLength As UInteger   ' DWORD* in/out
) As Integer
End Function

' Address : IN_ADDR*
' Port : WORD
' AddressString : LPSTR out
' AddressStringLength : DWORD* in/out
Declare PtrSafe Function RtlIpv4AddressToStringExA Lib "ntdll" ( _
    ByVal Address As LongPtr, _
    ByVal Port As Integer, _
    ByVal AddressString As String, _
    ByRef AddressStringLength 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

RtlIpv4AddressToStringExA = ctypes.windll.ntdll.RtlIpv4AddressToStringExA
RtlIpv4AddressToStringExA.restype = ctypes.c_int
RtlIpv4AddressToStringExA.argtypes = [
    ctypes.c_void_p,  # Address : IN_ADDR*
    ctypes.c_ushort,  # Port : WORD
    wintypes.LPSTR,  # AddressString : LPSTR out
    ctypes.POINTER(wintypes.DWORD),  # AddressStringLength : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ntdll.dll')
RtlIpv4AddressToStringExA = Fiddle::Function.new(
  lib['RtlIpv4AddressToStringExA'],
  [
    Fiddle::TYPE_VOIDP,  # Address : IN_ADDR*
    -Fiddle::TYPE_SHORT,  # Port : WORD
    Fiddle::TYPE_VOIDP,  # AddressString : LPSTR out
    Fiddle::TYPE_VOIDP,  # AddressStringLength : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ntdll")]
extern "system" {
    fn RtlIpv4AddressToStringExA(
        Address: *const IN_ADDR,  // IN_ADDR*
        Port: u16,  // WORD
        AddressString: *mut u8,  // LPSTR out
        AddressStringLength: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ntdll.dll", CharSet = CharSet.Ansi)]
public static extern int RtlIpv4AddressToStringExA(IntPtr Address, ushort Port, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder AddressString, ref uint AddressStringLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ntdll_RtlIpv4AddressToStringExA' -Namespace Win32 -PassThru
# $api::RtlIpv4AddressToStringExA(Address, Port, AddressString, AddressStringLength)

#uselib "ntdll.dll"
#func global RtlIpv4AddressToStringExA "RtlIpv4AddressToStringExA" sptr, sptr, sptr, sptr
; RtlIpv4AddressToStringExA varptr(Address), Port, varptr(AddressString), varptr(AddressStringLength)   ; 戻り値は stat
; Address : IN_ADDR* -> "sptr"
; Port : WORD -> "sptr"
; AddressString : LPSTR out -> "sptr"
; AddressStringLength : 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。

#uselib "ntdll.dll"
#cfunc global RtlIpv4AddressToStringExA "RtlIpv4AddressToStringExA" var, int, var, var
; res = RtlIpv4AddressToStringExA(Address, Port, AddressString, AddressStringLength)
; Address : IN_ADDR* -> "var"
; Port : WORD -> "int"
; AddressString : LPSTR 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 RtlIpv4AddressToStringExA(IN_ADDR* Address, WORD Port, LPSTR AddressString, DWORD* AddressStringLength)
#uselib "ntdll.dll"
#cfunc global RtlIpv4AddressToStringExA "RtlIpv4AddressToStringExA" var, int, var, var
; res = RtlIpv4AddressToStringExA(Address, Port, AddressString, AddressStringLength)
; Address : IN_ADDR* -> "var"
; Port : WORD -> "int"
; AddressString : LPSTR 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")
	procRtlIpv4AddressToStringExA = ntdll.NewProc("RtlIpv4AddressToStringExA")
)

// Address (IN_ADDR*), Port (WORD), AddressString (LPSTR out), AddressStringLength (DWORD* in/out)
r1, _, err := procRtlIpv4AddressToStringExA.Call(
	uintptr(Address),
	uintptr(Port),
	uintptr(AddressString),
	uintptr(AddressStringLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function RtlIpv4AddressToStringExA(
  Address: Pointer;   // IN_ADDR*
  Port: Word;   // WORD
  AddressString: PAnsiChar;   // LPSTR out
  AddressStringLength: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'ntdll.dll' name 'RtlIpv4AddressToStringExA';

result := DllCall("ntdll\RtlIpv4AddressToStringExA"
    , "Ptr", Address   ; IN_ADDR*
    , "UShort", Port   ; WORD
    , "Ptr", AddressString   ; LPSTR out
    , "Ptr", AddressStringLength   ; DWORD* in/out
    , "Int")   ; return: INT

●RtlIpv4AddressToStringExA(Address, Port, AddressString, AddressStringLength) = DLL("ntdll.dll", "int RtlIpv4AddressToStringExA(void*, int, char*, void*)")
# 呼び出し: RtlIpv4AddressToStringExA(Address, Port, AddressString, AddressStringLength)
# Address : IN_ADDR* -> "void*"
# Port : WORD -> "int"
# AddressString : LPSTR 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)。