getprotobynumber

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

PROTOENT* getprotobynumber(
    INT number
);

<DllImport("WS2_32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function getprotobynumber(
    number As Integer   ' INT
) As IntPtr
End Function

' number : INT
Declare PtrSafe Function getprotobynumber Lib "ws2_32" ( _
    ByVal number As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

getprotobynumber = ctypes.windll.ws2_32.getprotobynumber
getprotobynumber.restype = ctypes.c_void_p
getprotobynumber.argtypes = [
    ctypes.c_int,  # number : INT
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
getprotobynumber = Fiddle::Function.new(
  lib['getprotobynumber'],
  [
    Fiddle::TYPE_INT,  # number : INT
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "ws2_32")]
extern "system" {
    fn getprotobynumber(
        number: i32  // INT
    ) -> *mut PROTOENT;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", SetLastError = true)]
public static extern IntPtr getprotobynumber(int number);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_getprotobynumber' -Namespace Win32 -PassThru
# $api::getprotobynumber(number)

#uselib "WS2_32.dll"
#func global getprotobynumber "getprotobynumber" sptr
; getprotobynumber number   ; 戻り値は stat
; number : INT -> "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 getprotobynumber "getprotobynumber" int
; res = getprotobynumber(number)
; number : INT -> "int"

; PROTOENT* getprotobynumber(INT number)
#uselib "WS2_32.dll"
#cfunc global getprotobynumber "getprotobynumber" int
; res = getprotobynumber(number)
; number : INT -> "int"

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

var (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	procgetprotobynumber = ws2_32.NewProc("getprotobynumber")
)

// number (INT)
r1, _, err := procgetprotobynumber.Call(
	uintptr(number),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // PROTOENT*

function getprotobynumber(
  number: Integer   // INT
): Pointer; stdcall;
  external 'WS2_32.dll' name 'getprotobynumber';

result := DllCall("WS2_32\getprotobynumber"
    , "Int", number   ; INT
    , "Ptr")   ; return: PROTOENT*

●getprotobynumber(number) = DLL("WS2_32.dll", "void* getprotobynumber(int)")
# 呼び出し: getprotobynumber(number)
# number : INT -> "int"
# 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)。