EnumProtocolsA

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

INT EnumProtocolsA(
    INT* lpiProtocols,   // optional
    void* lpProtocolBuffer,
    DWORD* lpdwBufferLength
);

<DllImport("MSWSOCK.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function EnumProtocolsA(
    lpiProtocols As IntPtr,   ' INT* optional
    lpProtocolBuffer As IntPtr,   ' void* out
    ByRef lpdwBufferLength As UInteger   ' DWORD* in/out
) As Integer
End Function

' lpiProtocols : INT* optional
' lpProtocolBuffer : void* out
' lpdwBufferLength : DWORD* in/out
Declare PtrSafe Function EnumProtocolsA Lib "mswsock" ( _
    ByVal lpiProtocols As LongPtr, _
    ByVal lpProtocolBuffer As LongPtr, _
    ByRef lpdwBufferLength 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

EnumProtocolsA = ctypes.windll.mswsock.EnumProtocolsA
EnumProtocolsA.restype = ctypes.c_int
EnumProtocolsA.argtypes = [
    ctypes.POINTER(ctypes.c_int),  # lpiProtocols : INT* optional
    ctypes.POINTER(None),  # lpProtocolBuffer : void* out
    ctypes.POINTER(wintypes.DWORD),  # lpdwBufferLength : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MSWSOCK.dll')
EnumProtocolsA = Fiddle::Function.new(
  lib['EnumProtocolsA'],
  [
    Fiddle::TYPE_VOIDP,  # lpiProtocols : INT* optional
    Fiddle::TYPE_VOIDP,  # lpProtocolBuffer : void* out
    Fiddle::TYPE_VOIDP,  # lpdwBufferLength : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "mswsock")]
extern "system" {
    fn EnumProtocolsA(
        lpiProtocols: *mut i32,  // INT* optional
        lpProtocolBuffer: *mut (),  // void* out
        lpdwBufferLength: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("MSWSOCK.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern int EnumProtocolsA(IntPtr lpiProtocols, IntPtr lpProtocolBuffer, ref uint lpdwBufferLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MSWSOCK_EnumProtocolsA' -Namespace Win32 -PassThru
# $api::EnumProtocolsA(lpiProtocols, lpProtocolBuffer, lpdwBufferLength)

#uselib "MSWSOCK.dll"
#func global EnumProtocolsA "EnumProtocolsA" sptr, sptr, sptr
; EnumProtocolsA varptr(lpiProtocols), lpProtocolBuffer, varptr(lpdwBufferLength)   ; 戻り値は stat
; lpiProtocols : INT* optional -> "sptr"
; lpProtocolBuffer : void* out -> "sptr"
; lpdwBufferLength : 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 "MSWSOCK.dll"
#cfunc global EnumProtocolsA "EnumProtocolsA" var, sptr, var
; res = EnumProtocolsA(lpiProtocols, lpProtocolBuffer, lpdwBufferLength)
; lpiProtocols : INT* optional -> "var"
; lpProtocolBuffer : void* out -> "sptr"
; lpdwBufferLength : 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 EnumProtocolsA(INT* lpiProtocols, void* lpProtocolBuffer, DWORD* lpdwBufferLength)
#uselib "MSWSOCK.dll"
#cfunc global EnumProtocolsA "EnumProtocolsA" var, intptr, var
; res = EnumProtocolsA(lpiProtocols, lpProtocolBuffer, lpdwBufferLength)
; lpiProtocols : INT* optional -> "var"
; lpProtocolBuffer : void* out -> "intptr"
; lpdwBufferLength : 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 (
	mswsock = windows.NewLazySystemDLL("MSWSOCK.dll")
	procEnumProtocolsA = mswsock.NewProc("EnumProtocolsA")
)

// lpiProtocols (INT* optional), lpProtocolBuffer (void* out), lpdwBufferLength (DWORD* in/out)
r1, _, err := procEnumProtocolsA.Call(
	uintptr(lpiProtocols),
	uintptr(lpProtocolBuffer),
	uintptr(lpdwBufferLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function EnumProtocolsA(
  lpiProtocols: Pointer;   // INT* optional
  lpProtocolBuffer: Pointer;   // void* out
  lpdwBufferLength: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'MSWSOCK.dll' name 'EnumProtocolsA';

result := DllCall("MSWSOCK\EnumProtocolsA"
    , "Ptr", lpiProtocols   ; INT* optional
    , "Ptr", lpProtocolBuffer   ; void* out
    , "Ptr", lpdwBufferLength   ; DWORD* in/out
    , "Int")   ; return: INT

●EnumProtocolsA(lpiProtocols, lpProtocolBuffer, lpdwBufferLength) = DLL("MSWSOCK.dll", "int EnumProtocolsA(void*, void*, void*)")
# 呼び出し: EnumProtocolsA(lpiProtocols, lpProtocolBuffer, lpdwBufferLength)
# lpiProtocols : INT* optional -> "void*"
# lpProtocolBuffer : void* out -> "void*"
# lpdwBufferLength : 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)。