GetInterfaceDnsSettings

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

WIN32_ERROR GetInterfaceDnsSettings(
    GUID Interface,
    DNS_INTERFACE_SETTINGS* Settings
);

<DllImport("IPHLPAPI.dll", ExactSpelling:=True)>
Public Shared Function GetInterfaceDnsSettings(
    [Interface] As Guid,   ' GUID
    Settings As IntPtr   ' DNS_INTERFACE_SETTINGS* in/out
) As UInteger
End Function

' Interface : GUID
' Settings : DNS_INTERFACE_SETTINGS* in/out
Declare PtrSafe Function GetInterfaceDnsSettings Lib "iphlpapi" ( _
    ByVal Interface As LongPtr, _
    ByVal Settings 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

GetInterfaceDnsSettings = ctypes.windll.iphlpapi.GetInterfaceDnsSettings
GetInterfaceDnsSettings.restype = wintypes.DWORD
GetInterfaceDnsSettings.argtypes = [
    ctypes.c_void_p,  # Interface : GUID
    ctypes.c_void_p,  # Settings : DNS_INTERFACE_SETTINGS* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('IPHLPAPI.dll')
GetInterfaceDnsSettings = Fiddle::Function.new(
  lib['GetInterfaceDnsSettings'],
  [
    Fiddle::TYPE_VOIDP,  # Interface : GUID
    Fiddle::TYPE_VOIDP,  # Settings : DNS_INTERFACE_SETTINGS* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "iphlpapi")]
extern "system" {
    fn GetInterfaceDnsSettings(
        Interface: GUID,  // GUID
        Settings: *mut DNS_INTERFACE_SETTINGS  // DNS_INTERFACE_SETTINGS* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("IPHLPAPI.dll")]
public static extern uint GetInterfaceDnsSettings(Guid Interface, IntPtr Settings);
"@
$api = Add-Type -MemberDefinition $sig -Name 'IPHLPAPI_GetInterfaceDnsSettings' -Namespace Win32 -PassThru
# $api::GetInterfaceDnsSettings(Interface, Settings)

#uselib "IPHLPAPI.dll"
#func global GetInterfaceDnsSettings "GetInterfaceDnsSettings" sptr, sptr
; GetInterfaceDnsSettings Interface, varptr(Settings)   ; 戻り値は stat
; Interface : GUID -> "sptr"
; Settings : DNS_INTERFACE_SETTINGS* in/out -> "sptr"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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 "IPHLPAPI.dll"
#cfunc global GetInterfaceDnsSettings "GetInterfaceDnsSettings" int, var
; res = GetInterfaceDnsSettings(Interface, Settings)
; Interface : GUID -> "int"
; Settings : DNS_INTERFACE_SETTINGS* in/out -> "var"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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。

; WIN32_ERROR GetInterfaceDnsSettings(GUID Interface, DNS_INTERFACE_SETTINGS* Settings)
#uselib "IPHLPAPI.dll"
#cfunc global GetInterfaceDnsSettings "GetInterfaceDnsSettings" int, var
; res = GetInterfaceDnsSettings(Interface, Settings)
; Interface : GUID -> "int"
; Settings : DNS_INTERFACE_SETTINGS* in/out -> "var"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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 (
	iphlpapi = windows.NewLazySystemDLL("IPHLPAPI.dll")
	procGetInterfaceDnsSettings = iphlpapi.NewProc("GetInterfaceDnsSettings")
)

// Interface (GUID), Settings (DNS_INTERFACE_SETTINGS* in/out)
r1, _, err := procGetInterfaceDnsSettings.Call(
	uintptr(Interface),
	uintptr(Settings),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function GetInterfaceDnsSettings(
  Interface: TGUID;   // GUID
  Settings: Pointer   // DNS_INTERFACE_SETTINGS* in/out
): DWORD; stdcall;
  external 'IPHLPAPI.dll' name 'GetInterfaceDnsSettings';

result := DllCall("IPHLPAPI\GetInterfaceDnsSettings"
    , "Ptr", Interface   ; GUID
    , "Ptr", Settings   ; DNS_INTERFACE_SETTINGS* in/out
    , "UInt")   ; return: WIN32_ERROR

●GetInterfaceDnsSettings(Interface, Settings) = DLL("IPHLPAPI.dll", "dword GetInterfaceDnsSettings(void*, void*)")
# 呼び出し: GetInterfaceDnsSettings(Interface, Settings)
# Interface : GUID -> "void*"
# Settings : DNS_INTERFACE_SETTINGS* 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)。