DhcpV4FailoverEnumRelationship

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

DWORD DhcpV4FailoverEnumRelationship(
    LPWSTR ServerIpAddress,   // optional
    DWORD* ResumeHandle,
    DWORD PreferredMaximum,
    DHCP_FAILOVER_RELATIONSHIP_ARRAY** pRelationship,
    DWORD* RelationshipRead,
    DWORD* RelationshipTotal
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpV4FailoverEnumRelationship(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPWSTR optional
    ByRef ResumeHandle As UInteger,   ' DWORD* in/out
    PreferredMaximum As UInteger,   ' DWORD
    pRelationship As IntPtr,   ' DHCP_FAILOVER_RELATIONSHIP_ARRAY** out
    <Out> ByRef RelationshipRead As UInteger,   ' DWORD* out
    <Out> ByRef RelationshipTotal As UInteger   ' DWORD* out
) As UInteger
End Function

' ServerIpAddress : LPWSTR optional
' ResumeHandle : DWORD* in/out
' PreferredMaximum : DWORD
' pRelationship : DHCP_FAILOVER_RELATIONSHIP_ARRAY** out
' RelationshipRead : DWORD* out
' RelationshipTotal : DWORD* out
Declare PtrSafe Function DhcpV4FailoverEnumRelationship Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByRef ResumeHandle As Long, _
    ByVal PreferredMaximum As Long, _
    ByVal pRelationship As LongPtr, _
    ByRef RelationshipRead As Long, _
    ByRef RelationshipTotal 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

DhcpV4FailoverEnumRelationship = ctypes.windll.dhcpsapi.DhcpV4FailoverEnumRelationship
DhcpV4FailoverEnumRelationship.restype = wintypes.DWORD
DhcpV4FailoverEnumRelationship.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPWSTR optional
    ctypes.POINTER(wintypes.DWORD),  # ResumeHandle : DWORD* in/out
    wintypes.DWORD,  # PreferredMaximum : DWORD
    ctypes.c_void_p,  # pRelationship : DHCP_FAILOVER_RELATIONSHIP_ARRAY** out
    ctypes.POINTER(wintypes.DWORD),  # RelationshipRead : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # RelationshipTotal : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpV4FailoverEnumRelationship = Fiddle::Function.new(
  lib['DhcpV4FailoverEnumRelationship'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPWSTR optional
    Fiddle::TYPE_VOIDP,  # ResumeHandle : DWORD* in/out
    -Fiddle::TYPE_INT,  # PreferredMaximum : DWORD
    Fiddle::TYPE_VOIDP,  # pRelationship : DHCP_FAILOVER_RELATIONSHIP_ARRAY** out
    Fiddle::TYPE_VOIDP,  # RelationshipRead : DWORD* out
    Fiddle::TYPE_VOIDP,  # RelationshipTotal : DWORD* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpV4FailoverEnumRelationship(
        ServerIpAddress: *mut u16,  // LPWSTR optional
        ResumeHandle: *mut u32,  // DWORD* in/out
        PreferredMaximum: u32,  // DWORD
        pRelationship: *mut *mut DHCP_FAILOVER_RELATIONSHIP_ARRAY,  // DHCP_FAILOVER_RELATIONSHIP_ARRAY** out
        RelationshipRead: *mut u32,  // DWORD* out
        RelationshipTotal: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpV4FailoverEnumRelationship([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, ref uint ResumeHandle, uint PreferredMaximum, IntPtr pRelationship, out uint RelationshipRead, out uint RelationshipTotal);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpV4FailoverEnumRelationship' -Namespace Win32 -PassThru
# $api::DhcpV4FailoverEnumRelationship(ServerIpAddress, ResumeHandle, PreferredMaximum, pRelationship, RelationshipRead, RelationshipTotal)

#uselib "DHCPSAPI.dll"
#func global DhcpV4FailoverEnumRelationship "DhcpV4FailoverEnumRelationship" sptr, sptr, sptr, sptr, sptr, sptr
; DhcpV4FailoverEnumRelationship ServerIpAddress, varptr(ResumeHandle), PreferredMaximum, varptr(pRelationship), varptr(RelationshipRead), varptr(RelationshipTotal)   ; 戻り値は stat
; ServerIpAddress : LPWSTR optional -> "sptr"
; ResumeHandle : DWORD* in/out -> "sptr"
; PreferredMaximum : DWORD -> "sptr"
; pRelationship : DHCP_FAILOVER_RELATIONSHIP_ARRAY** out -> "sptr"
; RelationshipRead : DWORD* out -> "sptr"
; RelationshipTotal : 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 DhcpV4FailoverEnumRelationship "DhcpV4FailoverEnumRelationship" wstr, var, int, var, var, var
; res = DhcpV4FailoverEnumRelationship(ServerIpAddress, ResumeHandle, PreferredMaximum, pRelationship, RelationshipRead, RelationshipTotal)
; ServerIpAddress : LPWSTR optional -> "wstr"
; ResumeHandle : DWORD* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; pRelationship : DHCP_FAILOVER_RELATIONSHIP_ARRAY** out -> "var"
; RelationshipRead : DWORD* out -> "var"
; RelationshipTotal : 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 DhcpV4FailoverEnumRelationship(LPWSTR ServerIpAddress, DWORD* ResumeHandle, DWORD PreferredMaximum, DHCP_FAILOVER_RELATIONSHIP_ARRAY** pRelationship, DWORD* RelationshipRead, DWORD* RelationshipTotal)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpV4FailoverEnumRelationship "DhcpV4FailoverEnumRelationship" wstr, var, int, var, var, var
; res = DhcpV4FailoverEnumRelationship(ServerIpAddress, ResumeHandle, PreferredMaximum, pRelationship, RelationshipRead, RelationshipTotal)
; ServerIpAddress : LPWSTR optional -> "wstr"
; ResumeHandle : DWORD* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; pRelationship : DHCP_FAILOVER_RELATIONSHIP_ARRAY** out -> "var"
; RelationshipRead : DWORD* out -> "var"
; RelationshipTotal : 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")
	procDhcpV4FailoverEnumRelationship = dhcpsapi.NewProc("DhcpV4FailoverEnumRelationship")
)

// ServerIpAddress (LPWSTR optional), ResumeHandle (DWORD* in/out), PreferredMaximum (DWORD), pRelationship (DHCP_FAILOVER_RELATIONSHIP_ARRAY** out), RelationshipRead (DWORD* out), RelationshipTotal (DWORD* out)
r1, _, err := procDhcpV4FailoverEnumRelationship.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(ResumeHandle),
	uintptr(PreferredMaximum),
	uintptr(pRelationship),
	uintptr(RelationshipRead),
	uintptr(RelationshipTotal),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpV4FailoverEnumRelationship(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  ResumeHandle: Pointer;   // DWORD* in/out
  PreferredMaximum: DWORD;   // DWORD
  pRelationship: Pointer;   // DHCP_FAILOVER_RELATIONSHIP_ARRAY** out
  RelationshipRead: Pointer;   // DWORD* out
  RelationshipTotal: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpV4FailoverEnumRelationship';

result := DllCall("DHCPSAPI\DhcpV4FailoverEnumRelationship"
    , "WStr", ServerIpAddress   ; LPWSTR optional
    , "Ptr", ResumeHandle   ; DWORD* in/out
    , "UInt", PreferredMaximum   ; DWORD
    , "Ptr", pRelationship   ; DHCP_FAILOVER_RELATIONSHIP_ARRAY** out
    , "Ptr", RelationshipRead   ; DWORD* out
    , "Ptr", RelationshipTotal   ; DWORD* out
    , "UInt")   ; return: DWORD

●DhcpV4FailoverEnumRelationship(ServerIpAddress, ResumeHandle, PreferredMaximum, pRelationship, RelationshipRead, RelationshipTotal) = DLL("DHCPSAPI.dll", "dword DhcpV4FailoverEnumRelationship(char*, void*, dword, void*, void*, void*)")
# 呼び出し: DhcpV4FailoverEnumRelationship(ServerIpAddress, ResumeHandle, PreferredMaximum, pRelationship, RelationshipRead, RelationshipTotal)
# ServerIpAddress : LPWSTR optional -> "char*"
# ResumeHandle : DWORD* in/out -> "void*"
# PreferredMaximum : DWORD -> "dword"
# pRelationship : DHCP_FAILOVER_RELATIONSHIP_ARRAY** out -> "void*"
# RelationshipRead : DWORD* out -> "void*"
# RelationshipTotal : 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)。