WSAEnumNameSpaceProvidersA

// WS2_32.dll  (ANSI / -A)
#include <windows.h>

INT WSAEnumNameSpaceProvidersA(
    DWORD* lpdwBufferLength,
    WSANAMESPACE_INFOA* lpnspBuffer
);

<DllImport("WS2_32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WSAEnumNameSpaceProvidersA(
    ByRef lpdwBufferLength As UInteger,   ' DWORD* in/out
    lpnspBuffer As IntPtr   ' WSANAMESPACE_INFOA* out
) As Integer
End Function

' lpdwBufferLength : DWORD* in/out
' lpnspBuffer : WSANAMESPACE_INFOA* out
Declare PtrSafe Function WSAEnumNameSpaceProvidersA Lib "ws2_32" ( _
    ByRef lpdwBufferLength As Long, _
    ByVal lpnspBuffer 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

WSAEnumNameSpaceProvidersA = ctypes.windll.ws2_32.WSAEnumNameSpaceProvidersA
WSAEnumNameSpaceProvidersA.restype = ctypes.c_int
WSAEnumNameSpaceProvidersA.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # lpdwBufferLength : DWORD* in/out
    ctypes.c_void_p,  # lpnspBuffer : WSANAMESPACE_INFOA* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
WSAEnumNameSpaceProvidersA = Fiddle::Function.new(
  lib['WSAEnumNameSpaceProvidersA'],
  [
    Fiddle::TYPE_VOIDP,  # lpdwBufferLength : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # lpnspBuffer : WSANAMESPACE_INFOA* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ws2_32")]
extern "system" {
    fn WSAEnumNameSpaceProvidersA(
        lpdwBufferLength: *mut u32,  // DWORD* in/out
        lpnspBuffer: *mut WSANAMESPACE_INFOA  // WSANAMESPACE_INFOA* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern int WSAEnumNameSpaceProvidersA(ref uint lpdwBufferLength, IntPtr lpnspBuffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_WSAEnumNameSpaceProvidersA' -Namespace Win32 -PassThru
# $api::WSAEnumNameSpaceProvidersA(lpdwBufferLength, lpnspBuffer)

#uselib "WS2_32.dll"
#func global WSAEnumNameSpaceProvidersA "WSAEnumNameSpaceProvidersA" sptr, sptr
; WSAEnumNameSpaceProvidersA varptr(lpdwBufferLength), varptr(lpnspBuffer)   ; 戻り値は stat
; lpdwBufferLength : DWORD* in/out -> "sptr"
; lpnspBuffer : WSANAMESPACE_INFOA* 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 WSAEnumNameSpaceProvidersA "WSAEnumNameSpaceProvidersA" var, var
; res = WSAEnumNameSpaceProvidersA(lpdwBufferLength, lpnspBuffer)
; lpdwBufferLength : DWORD* in/out -> "var"
; lpnspBuffer : WSANAMESPACE_INFOA* 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 WSAEnumNameSpaceProvidersA(DWORD* lpdwBufferLength, WSANAMESPACE_INFOA* lpnspBuffer)
#uselib "WS2_32.dll"
#cfunc global WSAEnumNameSpaceProvidersA "WSAEnumNameSpaceProvidersA" var, var
; res = WSAEnumNameSpaceProvidersA(lpdwBufferLength, lpnspBuffer)
; lpdwBufferLength : DWORD* in/out -> "var"
; lpnspBuffer : WSANAMESPACE_INFOA* 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")
	procWSAEnumNameSpaceProvidersA = ws2_32.NewProc("WSAEnumNameSpaceProvidersA")
)

// lpdwBufferLength (DWORD* in/out), lpnspBuffer (WSANAMESPACE_INFOA* out)
r1, _, err := procWSAEnumNameSpaceProvidersA.Call(
	uintptr(lpdwBufferLength),
	uintptr(lpnspBuffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function WSAEnumNameSpaceProvidersA(
  lpdwBufferLength: Pointer;   // DWORD* in/out
  lpnspBuffer: Pointer   // WSANAMESPACE_INFOA* out
): Integer; stdcall;
  external 'WS2_32.dll' name 'WSAEnumNameSpaceProvidersA';

result := DllCall("WS2_32\WSAEnumNameSpaceProvidersA"
    , "Ptr", lpdwBufferLength   ; DWORD* in/out
    , "Ptr", lpnspBuffer   ; WSANAMESPACE_INFOA* out
    , "Int")   ; return: INT

●WSAEnumNameSpaceProvidersA(lpdwBufferLength, lpnspBuffer) = DLL("WS2_32.dll", "int WSAEnumNameSpaceProvidersA(void*, void*)")
# 呼び出し: WSAEnumNameSpaceProvidersA(lpdwBufferLength, lpnspBuffer)
# lpdwBufferLength : DWORD* in/out -> "void*"
# lpnspBuffer : WSANAMESPACE_INFOA* 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)。