DhcpV4CreatePolicy

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

DWORD DhcpV4CreatePolicy(
    LPWSTR ServerIpAddress,   // optional
    DHCP_POLICY* pPolicy
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpV4CreatePolicy(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPWSTR optional
    pPolicy As IntPtr   ' DHCP_POLICY*
) As UInteger
End Function

' ServerIpAddress : LPWSTR optional
' pPolicy : DHCP_POLICY*
Declare PtrSafe Function DhcpV4CreatePolicy Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal pPolicy 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

DhcpV4CreatePolicy = ctypes.windll.dhcpsapi.DhcpV4CreatePolicy
DhcpV4CreatePolicy.restype = wintypes.DWORD
DhcpV4CreatePolicy.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPWSTR optional
    ctypes.c_void_p,  # pPolicy : DHCP_POLICY*
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpV4CreatePolicy = Fiddle::Function.new(
  lib['DhcpV4CreatePolicy'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPWSTR optional
    Fiddle::TYPE_VOIDP,  # pPolicy : DHCP_POLICY*
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpV4CreatePolicy(
        ServerIpAddress: *mut u16,  // LPWSTR optional
        pPolicy: *mut DHCP_POLICY  // DHCP_POLICY*
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpV4CreatePolicy([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, IntPtr pPolicy);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpV4CreatePolicy' -Namespace Win32 -PassThru
# $api::DhcpV4CreatePolicy(ServerIpAddress, pPolicy)

#uselib "DHCPSAPI.dll"
#func global DhcpV4CreatePolicy "DhcpV4CreatePolicy" sptr, sptr
; DhcpV4CreatePolicy ServerIpAddress, varptr(pPolicy)   ; 戻り値は stat
; ServerIpAddress : LPWSTR optional -> "sptr"
; pPolicy : DHCP_POLICY* -> "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 DhcpV4CreatePolicy "DhcpV4CreatePolicy" wstr, var
; res = DhcpV4CreatePolicy(ServerIpAddress, pPolicy)
; ServerIpAddress : LPWSTR optional -> "wstr"
; pPolicy : DHCP_POLICY* -> "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 DhcpV4CreatePolicy(LPWSTR ServerIpAddress, DHCP_POLICY* pPolicy)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpV4CreatePolicy "DhcpV4CreatePolicy" wstr, var
; res = DhcpV4CreatePolicy(ServerIpAddress, pPolicy)
; ServerIpAddress : LPWSTR optional -> "wstr"
; pPolicy : DHCP_POLICY* -> "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")
	procDhcpV4CreatePolicy = dhcpsapi.NewProc("DhcpV4CreatePolicy")
)

// ServerIpAddress (LPWSTR optional), pPolicy (DHCP_POLICY*)
r1, _, err := procDhcpV4CreatePolicy.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(pPolicy),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpV4CreatePolicy(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  pPolicy: Pointer   // DHCP_POLICY*
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpV4CreatePolicy';

result := DllCall("DHCPSAPI\DhcpV4CreatePolicy"
    , "WStr", ServerIpAddress   ; LPWSTR optional
    , "Ptr", pPolicy   ; DHCP_POLICY*
    , "UInt")   ; return: DWORD

●DhcpV4CreatePolicy(ServerIpAddress, pPolicy) = DLL("DHCPSAPI.dll", "dword DhcpV4CreatePolicy(char*, void*)")
# 呼び出し: DhcpV4CreatePolicy(ServerIpAddress, pPolicy)
# ServerIpAddress : LPWSTR optional -> "char*"
# pPolicy : DHCP_POLICY* -> "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)。