WSAHtonl

// WS2_32.dll
#include <windows.h>

INT WSAHtonl(
    SOCKET s,
    DWORD hostlong,
    DWORD* lpnetlong
);

<DllImport("WS2_32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WSAHtonl(
    s As UIntPtr,   ' SOCKET
    hostlong As UInteger,   ' DWORD
    <Out> ByRef lpnetlong As UInteger   ' DWORD* out
) As Integer
End Function

' s : SOCKET
' hostlong : DWORD
' lpnetlong : DWORD* out
Declare PtrSafe Function WSAHtonl Lib "ws2_32" ( _
    ByVal s As LongPtr, _
    ByVal hostlong As Long, _
    ByRef lpnetlong 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

WSAHtonl = ctypes.windll.ws2_32.WSAHtonl
WSAHtonl.restype = ctypes.c_int
WSAHtonl.argtypes = [
    ctypes.c_size_t,  # s : SOCKET
    wintypes.DWORD,  # hostlong : DWORD
    ctypes.POINTER(wintypes.DWORD),  # lpnetlong : DWORD* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
WSAHtonl = Fiddle::Function.new(
  lib['WSAHtonl'],
  [
    Fiddle::TYPE_UINTPTR_T,  # s : SOCKET
    -Fiddle::TYPE_INT,  # hostlong : DWORD
    Fiddle::TYPE_VOIDP,  # lpnetlong : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ws2_32")]
extern "system" {
    fn WSAHtonl(
        s: usize,  // SOCKET
        hostlong: u32,  // DWORD
        lpnetlong: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", SetLastError = true)]
public static extern int WSAHtonl(UIntPtr s, uint hostlong, out uint lpnetlong);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_WSAHtonl' -Namespace Win32 -PassThru
# $api::WSAHtonl(s, hostlong, lpnetlong)

#uselib "WS2_32.dll"
#func global WSAHtonl "WSAHtonl" sptr, sptr, sptr
; WSAHtonl s, hostlong, varptr(lpnetlong)   ; 戻り値は stat
; s : SOCKET -> "sptr"
; hostlong : DWORD -> "sptr"
; lpnetlong : DWORD* 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 "WS2_32.dll"
#cfunc global WSAHtonl "WSAHtonl" sptr, int, var
; res = WSAHtonl(s, hostlong, lpnetlong)
; s : SOCKET -> "sptr"
; hostlong : DWORD -> "int"
; lpnetlong : DWORD* 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 WSAHtonl(SOCKET s, DWORD hostlong, DWORD* lpnetlong)
#uselib "WS2_32.dll"
#cfunc global WSAHtonl "WSAHtonl" intptr, int, var
; res = WSAHtonl(s, hostlong, lpnetlong)
; s : SOCKET -> "intptr"
; hostlong : DWORD -> "int"
; lpnetlong : DWORD* 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 (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	procWSAHtonl = ws2_32.NewProc("WSAHtonl")
)

// s (SOCKET), hostlong (DWORD), lpnetlong (DWORD* out)
r1, _, err := procWSAHtonl.Call(
	uintptr(s),
	uintptr(hostlong),
	uintptr(lpnetlong),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function WSAHtonl(
  s: NativeUInt;   // SOCKET
  hostlong: DWORD;   // DWORD
  lpnetlong: Pointer   // DWORD* out
): Integer; stdcall;
  external 'WS2_32.dll' name 'WSAHtonl';

result := DllCall("WS2_32\WSAHtonl"
    , "UPtr", s   ; SOCKET
    , "UInt", hostlong   ; DWORD
    , "Ptr", lpnetlong   ; DWORD* out
    , "Int")   ; return: INT

●WSAHtonl(s, hostlong, lpnetlong) = DLL("WS2_32.dll", "int WSAHtonl(int, dword, void*)")
# 呼び出し: WSAHtonl(s, hostlong, lpnetlong)
# s : SOCKET -> "int"
# hostlong : DWORD -> "dword"
# lpnetlong : DWORD* 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)。