DhcpGetOriginalSubnetMask

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

DWORD DhcpGetOriginalSubnetMask(
    LPCWSTR sAdapterName,
    DWORD* dwSubnetMask
);

<DllImport("dhcpcsvc.dll", ExactSpelling:=True)>
Public Shared Function DhcpGetOriginalSubnetMask(
    <MarshalAs(UnmanagedType.LPWStr)> sAdapterName As String,   ' LPCWSTR
    ByRef dwSubnetMask As UInteger   ' DWORD* in/out
) As UInteger
End Function

' sAdapterName : LPCWSTR
' dwSubnetMask : DWORD* in/out
Declare PtrSafe Function DhcpGetOriginalSubnetMask Lib "dhcpcsvc" ( _
    ByVal sAdapterName As LongPtr, _
    ByRef dwSubnetMask 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

DhcpGetOriginalSubnetMask = ctypes.windll.dhcpcsvc.DhcpGetOriginalSubnetMask
DhcpGetOriginalSubnetMask.restype = wintypes.DWORD
DhcpGetOriginalSubnetMask.argtypes = [
    wintypes.LPCWSTR,  # sAdapterName : LPCWSTR
    ctypes.POINTER(wintypes.DWORD),  # dwSubnetMask : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dhcpcsvc.dll')
DhcpGetOriginalSubnetMask = Fiddle::Function.new(
  lib['DhcpGetOriginalSubnetMask'],
  [
    Fiddle::TYPE_VOIDP,  # sAdapterName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # dwSubnetMask : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpcsvc")]
extern "system" {
    fn DhcpGetOriginalSubnetMask(
        sAdapterName: *const u16,  // LPCWSTR
        dwSubnetMask: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("dhcpcsvc.dll")]
public static extern uint DhcpGetOriginalSubnetMask([MarshalAs(UnmanagedType.LPWStr)] string sAdapterName, ref uint dwSubnetMask);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dhcpcsvc_DhcpGetOriginalSubnetMask' -Namespace Win32 -PassThru
# $api::DhcpGetOriginalSubnetMask(sAdapterName, dwSubnetMask)

#uselib "dhcpcsvc.dll"
#func global DhcpGetOriginalSubnetMask "DhcpGetOriginalSubnetMask" sptr, sptr
; DhcpGetOriginalSubnetMask sAdapterName, varptr(dwSubnetMask)   ; 戻り値は stat
; sAdapterName : LPCWSTR -> "sptr"
; dwSubnetMask : DWORD* in/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 "dhcpcsvc.dll"
#cfunc global DhcpGetOriginalSubnetMask "DhcpGetOriginalSubnetMask" wstr, var
; res = DhcpGetOriginalSubnetMask(sAdapterName, dwSubnetMask)
; sAdapterName : LPCWSTR -> "wstr"
; dwSubnetMask : DWORD* in/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 DhcpGetOriginalSubnetMask(LPCWSTR sAdapterName, DWORD* dwSubnetMask)
#uselib "dhcpcsvc.dll"
#cfunc global DhcpGetOriginalSubnetMask "DhcpGetOriginalSubnetMask" wstr, var
; res = DhcpGetOriginalSubnetMask(sAdapterName, dwSubnetMask)
; sAdapterName : LPCWSTR -> "wstr"
; dwSubnetMask : DWORD* in/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 (
	dhcpcsvc = windows.NewLazySystemDLL("dhcpcsvc.dll")
	procDhcpGetOriginalSubnetMask = dhcpcsvc.NewProc("DhcpGetOriginalSubnetMask")
)

// sAdapterName (LPCWSTR), dwSubnetMask (DWORD* in/out)
r1, _, err := procDhcpGetOriginalSubnetMask.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(sAdapterName))),
	uintptr(dwSubnetMask),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpGetOriginalSubnetMask(
  sAdapterName: PWideChar;   // LPCWSTR
  dwSubnetMask: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'dhcpcsvc.dll' name 'DhcpGetOriginalSubnetMask';

result := DllCall("dhcpcsvc\DhcpGetOriginalSubnetMask"
    , "WStr", sAdapterName   ; LPCWSTR
    , "Ptr", dwSubnetMask   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●DhcpGetOriginalSubnetMask(sAdapterName, dwSubnetMask) = DLL("dhcpcsvc.dll", "dword DhcpGetOriginalSubnetMask(char*, void*)")
# 呼び出し: DhcpGetOriginalSubnetMask(sAdapterName, dwSubnetMask)
# sAdapterName : LPCWSTR -> "char*"
# dwSubnetMask : DWORD* in/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)。