NetApiBufferSize

// NETAPI32.dll
#include <windows.h>

DWORD NetApiBufferSize(
    void* Buffer,
    DWORD* ByteCount
);

<DllImport("NETAPI32.dll", ExactSpelling:=True)>
Public Shared Function NetApiBufferSize(
    Buffer As IntPtr,   ' void*
    <Out> ByRef ByteCount As UInteger   ' DWORD* out
) As UInteger
End Function

' Buffer : void*
' ByteCount : DWORD* out
Declare PtrSafe Function NetApiBufferSize Lib "netapi32" ( _
    ByVal Buffer As LongPtr, _
    ByRef ByteCount 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

NetApiBufferSize = ctypes.windll.netapi32.NetApiBufferSize
NetApiBufferSize.restype = wintypes.DWORD
NetApiBufferSize.argtypes = [
    ctypes.POINTER(None),  # Buffer : void*
    ctypes.POINTER(wintypes.DWORD),  # ByteCount : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('NETAPI32.dll')
NetApiBufferSize = Fiddle::Function.new(
  lib['NetApiBufferSize'],
  [
    Fiddle::TYPE_VOIDP,  # Buffer : void*
    Fiddle::TYPE_VOIDP,  # ByteCount : DWORD* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "netapi32")]
extern "system" {
    fn NetApiBufferSize(
        Buffer: *mut (),  // void*
        ByteCount: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("NETAPI32.dll")]
public static extern uint NetApiBufferSize(IntPtr Buffer, out uint ByteCount);
"@
$api = Add-Type -MemberDefinition $sig -Name 'NETAPI32_NetApiBufferSize' -Namespace Win32 -PassThru
# $api::NetApiBufferSize(Buffer, ByteCount)

#uselib "NETAPI32.dll"
#func global NetApiBufferSize "NetApiBufferSize" sptr, sptr
; NetApiBufferSize Buffer, varptr(ByteCount)   ; 戻り値は stat
; Buffer : void* -> "sptr"
; ByteCount : 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 "NETAPI32.dll"
#cfunc global NetApiBufferSize "NetApiBufferSize" sptr, var
; res = NetApiBufferSize(Buffer, ByteCount)
; Buffer : void* -> "sptr"
; ByteCount : 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。

; DWORD NetApiBufferSize(void* Buffer, DWORD* ByteCount)
#uselib "NETAPI32.dll"
#cfunc global NetApiBufferSize "NetApiBufferSize" intptr, var
; res = NetApiBufferSize(Buffer, ByteCount)
; Buffer : void* -> "intptr"
; ByteCount : 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 (
	netapi32 = windows.NewLazySystemDLL("NETAPI32.dll")
	procNetApiBufferSize = netapi32.NewProc("NetApiBufferSize")
)

// Buffer (void*), ByteCount (DWORD* out)
r1, _, err := procNetApiBufferSize.Call(
	uintptr(Buffer),
	uintptr(ByteCount),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function NetApiBufferSize(
  Buffer: Pointer;   // void*
  ByteCount: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'NETAPI32.dll' name 'NetApiBufferSize';

result := DllCall("NETAPI32\NetApiBufferSize"
    , "Ptr", Buffer   ; void*
    , "Ptr", ByteCount   ; DWORD* out
    , "UInt")   ; return: DWORD

●NetApiBufferSize(Buffer, ByteCount) = DLL("NETAPI32.dll", "dword NetApiBufferSize(void*, void*)")
# 呼び出し: NetApiBufferSize(Buffer, ByteCount)
# Buffer : void* -> "void*"
# ByteCount : 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)。