DhcpV4FailoverGetRelationship

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

DWORD DhcpV4FailoverGetRelationship(
    LPWSTR ServerIpAddress,   // optional
    LPWSTR pRelationshipName,
    DHCP_FAILOVER_RELATIONSHIP** pRelationship
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpV4FailoverGetRelationship(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> pRelationshipName As String,   ' LPWSTR
    pRelationship As IntPtr   ' DHCP_FAILOVER_RELATIONSHIP** out
) As UInteger
End Function

' ServerIpAddress : LPWSTR optional
' pRelationshipName : LPWSTR
' pRelationship : DHCP_FAILOVER_RELATIONSHIP** out
Declare PtrSafe Function DhcpV4FailoverGetRelationship Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal pRelationshipName As LongPtr, _
    ByVal pRelationship 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

DhcpV4FailoverGetRelationship = ctypes.windll.dhcpsapi.DhcpV4FailoverGetRelationship
DhcpV4FailoverGetRelationship.restype = wintypes.DWORD
DhcpV4FailoverGetRelationship.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPWSTR optional
    wintypes.LPCWSTR,  # pRelationshipName : LPWSTR
    ctypes.c_void_p,  # pRelationship : DHCP_FAILOVER_RELATIONSHIP** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpV4FailoverGetRelationship = Fiddle::Function.new(
  lib['DhcpV4FailoverGetRelationship'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPWSTR optional
    Fiddle::TYPE_VOIDP,  # pRelationshipName : LPWSTR
    Fiddle::TYPE_VOIDP,  # pRelationship : DHCP_FAILOVER_RELATIONSHIP** out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpV4FailoverGetRelationship(
        ServerIpAddress: *mut u16,  // LPWSTR optional
        pRelationshipName: *mut u16,  // LPWSTR
        pRelationship: *mut *mut DHCP_FAILOVER_RELATIONSHIP  // DHCP_FAILOVER_RELATIONSHIP** out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpV4FailoverGetRelationship([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, [MarshalAs(UnmanagedType.LPWStr)] string pRelationshipName, IntPtr pRelationship);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpV4FailoverGetRelationship' -Namespace Win32 -PassThru
# $api::DhcpV4FailoverGetRelationship(ServerIpAddress, pRelationshipName, pRelationship)

#uselib "DHCPSAPI.dll"
#func global DhcpV4FailoverGetRelationship "DhcpV4FailoverGetRelationship" sptr, sptr, sptr
; DhcpV4FailoverGetRelationship ServerIpAddress, pRelationshipName, varptr(pRelationship)   ; 戻り値は stat
; ServerIpAddress : LPWSTR optional -> "sptr"
; pRelationshipName : LPWSTR -> "sptr"
; pRelationship : DHCP_FAILOVER_RELATIONSHIP** 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 DhcpV4FailoverGetRelationship "DhcpV4FailoverGetRelationship" wstr, wstr, var
; res = DhcpV4FailoverGetRelationship(ServerIpAddress, pRelationshipName, pRelationship)
; ServerIpAddress : LPWSTR optional -> "wstr"
; pRelationshipName : LPWSTR -> "wstr"
; pRelationship : DHCP_FAILOVER_RELATIONSHIP** 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 DhcpV4FailoverGetRelationship(LPWSTR ServerIpAddress, LPWSTR pRelationshipName, DHCP_FAILOVER_RELATIONSHIP** pRelationship)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpV4FailoverGetRelationship "DhcpV4FailoverGetRelationship" wstr, wstr, var
; res = DhcpV4FailoverGetRelationship(ServerIpAddress, pRelationshipName, pRelationship)
; ServerIpAddress : LPWSTR optional -> "wstr"
; pRelationshipName : LPWSTR -> "wstr"
; pRelationship : DHCP_FAILOVER_RELATIONSHIP** 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")
	procDhcpV4FailoverGetRelationship = dhcpsapi.NewProc("DhcpV4FailoverGetRelationship")
)

// ServerIpAddress (LPWSTR optional), pRelationshipName (LPWSTR), pRelationship (DHCP_FAILOVER_RELATIONSHIP** out)
r1, _, err := procDhcpV4FailoverGetRelationship.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pRelationshipName))),
	uintptr(pRelationship),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpV4FailoverGetRelationship(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  pRelationshipName: PWideChar;   // LPWSTR
  pRelationship: Pointer   // DHCP_FAILOVER_RELATIONSHIP** out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpV4FailoverGetRelationship';

result := DllCall("DHCPSAPI\DhcpV4FailoverGetRelationship"
    , "WStr", ServerIpAddress   ; LPWSTR optional
    , "WStr", pRelationshipName   ; LPWSTR
    , "Ptr", pRelationship   ; DHCP_FAILOVER_RELATIONSHIP** out
    , "UInt")   ; return: DWORD

●DhcpV4FailoverGetRelationship(ServerIpAddress, pRelationshipName, pRelationship) = DLL("DHCPSAPI.dll", "dword DhcpV4FailoverGetRelationship(char*, char*, void*)")
# 呼び出し: DhcpV4FailoverGetRelationship(ServerIpAddress, pRelationshipName, pRelationship)
# ServerIpAddress : LPWSTR optional -> "char*"
# pRelationshipName : LPWSTR -> "char*"
# pRelationship : DHCP_FAILOVER_RELATIONSHIP** 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)。