WSAStartup

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

INT WSAStartup(
    WORD wVersionRequested,
    WSADATA* lpWSAData
);

<DllImport("WS2_32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WSAStartup(
    wVersionRequested As UShort,   ' WORD
    lpWSAData As IntPtr   ' WSADATA* out
) As Integer
End Function

' wVersionRequested : WORD
' lpWSAData : WSADATA* out
Declare PtrSafe Function WSAStartup Lib "ws2_32" ( _
    ByVal wVersionRequested As Integer, _
    ByVal lpWSAData As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

WSAStartup = ctypes.windll.ws2_32.WSAStartup
WSAStartup.restype = ctypes.c_int
WSAStartup.argtypes = [
    ctypes.c_ushort,  # wVersionRequested : WORD
    ctypes.c_void_p,  # lpWSAData : WSADATA* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
WSAStartup = Fiddle::Function.new(
  lib['WSAStartup'],
  [
    -Fiddle::TYPE_SHORT,  # wVersionRequested : WORD
    Fiddle::TYPE_VOIDP,  # lpWSAData : WSADATA* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ws2_32")]
extern "system" {
    fn WSAStartup(
        wVersionRequested: u16,  // WORD
        lpWSAData: *mut WSADATA  // WSADATA* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", SetLastError = true)]
public static extern int WSAStartup(ushort wVersionRequested, IntPtr lpWSAData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_WSAStartup' -Namespace Win32 -PassThru
# $api::WSAStartup(wVersionRequested, lpWSAData)

#uselib "WS2_32.dll"
#func global WSAStartup "WSAStartup" sptr, sptr
; WSAStartup wVersionRequested, varptr(lpWSAData)   ; 戻り値は stat
; wVersionRequested : WORD -> "sptr"
; lpWSAData : WSADATA* 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 WSAStartup "WSAStartup" int, var
; res = WSAStartup(wVersionRequested, lpWSAData)
; wVersionRequested : WORD -> "int"
; lpWSAData : WSADATA* 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 WSAStartup(WORD wVersionRequested, WSADATA* lpWSAData)
#uselib "WS2_32.dll"
#cfunc global WSAStartup "WSAStartup" int, var
; res = WSAStartup(wVersionRequested, lpWSAData)
; wVersionRequested : WORD -> "int"
; lpWSAData : WSADATA* 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")
	procWSAStartup = ws2_32.NewProc("WSAStartup")
)

// wVersionRequested (WORD), lpWSAData (WSADATA* out)
r1, _, err := procWSAStartup.Call(
	uintptr(wVersionRequested),
	uintptr(lpWSAData),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function WSAStartup(
  wVersionRequested: Word;   // WORD
  lpWSAData: Pointer   // WSADATA* out
): Integer; stdcall;
  external 'WS2_32.dll' name 'WSAStartup';

result := DllCall("WS2_32\WSAStartup"
    , "UShort", wVersionRequested   ; WORD
    , "Ptr", lpWSAData   ; WSADATA* out
    , "Int")   ; return: INT

●WSAStartup(wVersionRequested, lpWSAData) = DLL("WS2_32.dll", "int WSAStartup(int, void*)")
# 呼び出し: WSAStartup(wVersionRequested, lpWSAData)
# wVersionRequested : WORD -> "int"
# lpWSAData : WSADATA* 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)。