DhcpV4EnumSubnetReservations

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

DWORD DhcpV4EnumSubnetReservations(
    LPCWSTR ServerIpAddress,   // optional
    DWORD SubnetAddress,
    DWORD* ResumeHandle,
    DWORD PreferredMaximum,
    DHCP_RESERVATION_INFO_ARRAY** EnumElementInfo,
    DWORD* ElementsRead,
    DWORD* ElementsTotal
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpV4EnumSubnetReservations(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPCWSTR optional
    SubnetAddress As UInteger,   ' DWORD
    ByRef ResumeHandle As UInteger,   ' DWORD* in/out
    PreferredMaximum As UInteger,   ' DWORD
    EnumElementInfo As IntPtr,   ' DHCP_RESERVATION_INFO_ARRAY** out
    <Out> ByRef ElementsRead As UInteger,   ' DWORD* out
    <Out> ByRef ElementsTotal As UInteger   ' DWORD* out
) As UInteger
End Function

' ServerIpAddress : LPCWSTR optional
' SubnetAddress : DWORD
' ResumeHandle : DWORD* in/out
' PreferredMaximum : DWORD
' EnumElementInfo : DHCP_RESERVATION_INFO_ARRAY** out
' ElementsRead : DWORD* out
' ElementsTotal : DWORD* out
Declare PtrSafe Function DhcpV4EnumSubnetReservations Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal SubnetAddress As Long, _
    ByRef ResumeHandle As Long, _
    ByVal PreferredMaximum As Long, _
    ByVal EnumElementInfo As LongPtr, _
    ByRef ElementsRead As Long, _
    ByRef ElementsTotal 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

DhcpV4EnumSubnetReservations = ctypes.windll.dhcpsapi.DhcpV4EnumSubnetReservations
DhcpV4EnumSubnetReservations.restype = wintypes.DWORD
DhcpV4EnumSubnetReservations.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPCWSTR optional
    wintypes.DWORD,  # SubnetAddress : DWORD
    ctypes.POINTER(wintypes.DWORD),  # ResumeHandle : DWORD* in/out
    wintypes.DWORD,  # PreferredMaximum : DWORD
    ctypes.c_void_p,  # EnumElementInfo : DHCP_RESERVATION_INFO_ARRAY** out
    ctypes.POINTER(wintypes.DWORD),  # ElementsRead : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # ElementsTotal : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpV4EnumSubnetReservations = Fiddle::Function.new(
  lib['DhcpV4EnumSubnetReservations'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPCWSTR optional
    -Fiddle::TYPE_INT,  # SubnetAddress : DWORD
    Fiddle::TYPE_VOIDP,  # ResumeHandle : DWORD* in/out
    -Fiddle::TYPE_INT,  # PreferredMaximum : DWORD
    Fiddle::TYPE_VOIDP,  # EnumElementInfo : DHCP_RESERVATION_INFO_ARRAY** out
    Fiddle::TYPE_VOIDP,  # ElementsRead : DWORD* out
    Fiddle::TYPE_VOIDP,  # ElementsTotal : DWORD* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpV4EnumSubnetReservations(
        ServerIpAddress: *const u16,  // LPCWSTR optional
        SubnetAddress: u32,  // DWORD
        ResumeHandle: *mut u32,  // DWORD* in/out
        PreferredMaximum: u32,  // DWORD
        EnumElementInfo: *mut *mut DHCP_RESERVATION_INFO_ARRAY,  // DHCP_RESERVATION_INFO_ARRAY** out
        ElementsRead: *mut u32,  // DWORD* out
        ElementsTotal: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpV4EnumSubnetReservations([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, uint SubnetAddress, ref uint ResumeHandle, uint PreferredMaximum, IntPtr EnumElementInfo, out uint ElementsRead, out uint ElementsTotal);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpV4EnumSubnetReservations' -Namespace Win32 -PassThru
# $api::DhcpV4EnumSubnetReservations(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, EnumElementInfo, ElementsRead, ElementsTotal)

#uselib "DHCPSAPI.dll"
#func global DhcpV4EnumSubnetReservations "DhcpV4EnumSubnetReservations" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; DhcpV4EnumSubnetReservations ServerIpAddress, SubnetAddress, varptr(ResumeHandle), PreferredMaximum, varptr(EnumElementInfo), varptr(ElementsRead), varptr(ElementsTotal)   ; 戻り値は stat
; ServerIpAddress : LPCWSTR optional -> "sptr"
; SubnetAddress : DWORD -> "sptr"
; ResumeHandle : DWORD* in/out -> "sptr"
; PreferredMaximum : DWORD -> "sptr"
; EnumElementInfo : DHCP_RESERVATION_INFO_ARRAY** out -> "sptr"
; ElementsRead : DWORD* out -> "sptr"
; ElementsTotal : 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 "DHCPSAPI.dll"
#cfunc global DhcpV4EnumSubnetReservations "DhcpV4EnumSubnetReservations" wstr, int, var, int, var, var, var
; res = DhcpV4EnumSubnetReservations(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, EnumElementInfo, ElementsRead, ElementsTotal)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; SubnetAddress : DWORD -> "int"
; ResumeHandle : DWORD* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; EnumElementInfo : DHCP_RESERVATION_INFO_ARRAY** out -> "var"
; ElementsRead : DWORD* out -> "var"
; ElementsTotal : 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 DhcpV4EnumSubnetReservations(LPCWSTR ServerIpAddress, DWORD SubnetAddress, DWORD* ResumeHandle, DWORD PreferredMaximum, DHCP_RESERVATION_INFO_ARRAY** EnumElementInfo, DWORD* ElementsRead, DWORD* ElementsTotal)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpV4EnumSubnetReservations "DhcpV4EnumSubnetReservations" wstr, int, var, int, var, var, var
; res = DhcpV4EnumSubnetReservations(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, EnumElementInfo, ElementsRead, ElementsTotal)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; SubnetAddress : DWORD -> "int"
; ResumeHandle : DWORD* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; EnumElementInfo : DHCP_RESERVATION_INFO_ARRAY** out -> "var"
; ElementsRead : DWORD* out -> "var"
; ElementsTotal : 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 (
	dhcpsapi = windows.NewLazySystemDLL("DHCPSAPI.dll")
	procDhcpV4EnumSubnetReservations = dhcpsapi.NewProc("DhcpV4EnumSubnetReservations")
)

// ServerIpAddress (LPCWSTR optional), SubnetAddress (DWORD), ResumeHandle (DWORD* in/out), PreferredMaximum (DWORD), EnumElementInfo (DHCP_RESERVATION_INFO_ARRAY** out), ElementsRead (DWORD* out), ElementsTotal (DWORD* out)
r1, _, err := procDhcpV4EnumSubnetReservations.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(SubnetAddress),
	uintptr(ResumeHandle),
	uintptr(PreferredMaximum),
	uintptr(EnumElementInfo),
	uintptr(ElementsRead),
	uintptr(ElementsTotal),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpV4EnumSubnetReservations(
  ServerIpAddress: PWideChar;   // LPCWSTR optional
  SubnetAddress: DWORD;   // DWORD
  ResumeHandle: Pointer;   // DWORD* in/out
  PreferredMaximum: DWORD;   // DWORD
  EnumElementInfo: Pointer;   // DHCP_RESERVATION_INFO_ARRAY** out
  ElementsRead: Pointer;   // DWORD* out
  ElementsTotal: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpV4EnumSubnetReservations';

result := DllCall("DHCPSAPI\DhcpV4EnumSubnetReservations"
    , "WStr", ServerIpAddress   ; LPCWSTR optional
    , "UInt", SubnetAddress   ; DWORD
    , "Ptr", ResumeHandle   ; DWORD* in/out
    , "UInt", PreferredMaximum   ; DWORD
    , "Ptr", EnumElementInfo   ; DHCP_RESERVATION_INFO_ARRAY** out
    , "Ptr", ElementsRead   ; DWORD* out
    , "Ptr", ElementsTotal   ; DWORD* out
    , "UInt")   ; return: DWORD

●DhcpV4EnumSubnetReservations(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, EnumElementInfo, ElementsRead, ElementsTotal) = DLL("DHCPSAPI.dll", "dword DhcpV4EnumSubnetReservations(char*, dword, void*, dword, void*, void*, void*)")
# 呼び出し: DhcpV4EnumSubnetReservations(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, EnumElementInfo, ElementsRead, ElementsTotal)
# ServerIpAddress : LPCWSTR optional -> "char*"
# SubnetAddress : DWORD -> "dword"
# ResumeHandle : DWORD* in/out -> "void*"
# PreferredMaximum : DWORD -> "dword"
# EnumElementInfo : DHCP_RESERVATION_INFO_ARRAY** out -> "void*"
# ElementsRead : DWORD* out -> "void*"
# ElementsTotal : 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)。